CN117706019A - Regulation and control system and method for time-varying flow-down combustion research - Google Patents

Abstract

The invention discloses a regulation and control system for combustion research under time-varying incoming flow, which comprises a flow regulation and control device, an oil circuit system and a signal feedback system. The flow regulating device consists of an air compressor, a surge tank, an electric regulating valve group, a flowmeter and the like, and fine control of the air flow is realized by regulating the electric valves of different branches. The oil circuit system comprises multiple paths of fuel oil supply corresponding to the combustion chamber and the heater, and is controlled in a closed loop mode according to the set fuel oil flow. The signal feedback system collects parameter signals in real time through a pressure gauge and a flowmeter which are arranged at key positions. During time-varying regulation, closed-loop control of air and fuel flow is realized through PID regulation; different air time-varying flow rate change rates are realized by changing the opening degree of the valve and the path of the pipeline; the accurate adjustment of the temperature is realized by matching the oil-gas ratio of the fuel oil and the air. The invention can flexibly and accurately realize time-varying regulation and control of air flow and temperature, and meet the requirement of combustion process research on condition control.

Description

Regulation and control system and method for time-varying flow-down combustion research

Technical Field

The invention relates to the technical field of engine combustion characteristic tests, in particular to a regulation and control system and method for combustion research under time-varying incoming flow.

Background

The thrust-augmentation, sub-combustion punching and multi-mode punching combustion chamber is in a time-varying state of an inlet flow field in a flight attitude change or engine working mode conversion process, the punching engine combustion chamber and the turbine engine thrust-augmentation combustion chamber are often in a working state of rapid change of inlet pneumatic thermodynamic parameters, each physical parameter in the combined engine super combustion chamber mode conversion process has extremely strong time-varying characteristics, a test system capable of simulating the dynamic change process is built, the test research related to the advanced punching engine combustion chamber, the turbine engine thrust-augmentation combustion chamber and the combined power combustion chamber can be developed, at present, the related test system mostly adopts a manual valve or an electric valve to carry out single parameter adjustment, and the time-varying regulation characteristics of multi-parameter matching cannot be realized.

Disclosure of Invention

The invention aims at solving the technical problems related to the background technology, and provides a regulation and control system and a method for a time-varying inflow combustion study, so as to solve the problem of flow regulation and control in the combustion test study.

The invention adopts the following technical scheme for solving the technical problems:

a regulation and control system for a time-varying flow-down combustion study comprises an air compressor, a surge tank, first to sixth electric regulating valves, a manual flow regulating valve, an air flowmeter, a 500 ℃ electric heater, an electric butterfly valve, first to second safety valves, a 200 ℃ electric heater, a gas warmer, an air blender, a temperature sensor, first to third pressure sensors, a combustion chamber, a vacuum tank, a vacuum pressure gauge, a vacuum pump, a fuel tank, first to third fuel pumps, first to third electric oil outlet valves, first to third manual oil outlet valves, first to third electric oil return valves, first to third manual oil return valves, first to third fuel flow meters and first to third oil supply pressure gauges;

the pressure stabilizing tank comprises an inlet, a pressure measuring point and an outlet;

the air blender comprises first to third inlets and an outlet, wherein the air is used for being blended by the first to third inlets and then discharged from the outlet;

the fuel gas warmer comprises an air inlet, an air outlet and a fuel oil inlet, and is used for heating air entering from the air inlet and then discharging the air from the air outlet;

The combustion chamber comprises an air inlet, an air outlet, a first fuel inlet and a second fuel inlet;

the fuel tank comprises first to third inlets and first to third outlets;

the vacuum tank comprises an air inlet, a pressure measuring point, a first air outlet and a second air outlet;

the inlet of the air compressor is connected with outside air, and the outlet of the air compressor is connected with an inlet pipeline of the pressure stabilizing tank;

the outlet of the pressure stabilizing tank is respectively connected with one end pipeline of a first electric regulating valve, a second electric regulating valve, a manual flow regulating valve and an air flowmeter, the other ends of the first electric regulating valve, the second electric regulating valve and the manual flow regulating valve are respectively connected with outside air, and the other ends of the air flowmeter are respectively connected with one end of a third electric regulating valve, one end of a fourth electric regulating valve, one end of a fifth electric regulating valve and an inlet pipeline of a second safety valve;

the first pressure sensor is arranged at a pressure measuring point of the pressure stabilizing tank;

the other end of the third electric regulating valve, the 500 ℃ electric heater and one end of the electric butterfly valve are connected in sequence through pipelines;

the other end of the electric butterfly valve is connected with a first inlet pipeline of the air blender;

The other end of the fourth electric regulating valve is respectively connected with the second inlet of the air blender and the inlet pipeline of the first safety valve;

the other end of the fifth electric regulating valve, the 200 ℃ level electric heater and the air inlet of the gas warmer are connected in a pipeline way in sequence;

the third inlet of the air blender is connected with the outlet pipeline of the gas warmer, and the outlet of the air blender is connected with the air inlet pipeline of the combustion chamber;

the temperature sensor, the second pressure sensor and the third pressure sensor are all arranged in a pipeline between the outlet of the air blender and the air inlet of the combustion chamber, wherein the temperature sensor is used for measuring the temperature of the position where the temperature sensor is located, the second pressure sensor is used for measuring the static pressure of the position where the temperature sensor is located, and the third pressure sensor is used for measuring the total pressure of the position where the temperature sensor is located;

the air inlet of the vacuum tank is connected with an air outlet pipeline of the combustion chamber, the first air outlet is connected with one end pipeline of the sixth electric regulating valve, and the second air outlet is connected with one end pipeline of the vacuum pump;

the other end of the sixth electric regulating valve and the other end of the vacuum pump are connected with outside air;

the vacuum pressure gauge is arranged at a pressure measuring point of the vacuum tank and is used for measuring the pressure in the vacuum tank;

The first to third outlets of the fuel oil tank are respectively connected with inlets of the first to third fuel pumps in one-to-one correspondence;

the outlet of the first fuel pump is respectively connected with one end of the first electric oil outlet valve and one end of the first electric oil return valve through pipelines;

the other end of the first electric oil outlet valve, the first manual oil outlet valve and the fuel inlet of the fuel gas heater are connected through pipelines in sequence;

the other end of the first electric oil return valve, the first manual oil return valve and a first inlet of the fuel oil tank are connected through pipelines in sequence;

the first fuel flow meter and the first fuel supply pressure meter are arranged in a pipeline between the first manual oil outlet valve and the fuel inlet of the fuel gas heater and are respectively used for measuring the fuel flow and the oil pressure of the position where the first manual oil outlet valve and the fuel inlet of the fuel gas heater are positioned;

the outlet of the second fuel pump is respectively connected with one end of the second electric oil outlet valve and one end of the second electric oil return valve through pipelines;

the other end of the second electric oil outlet valve, the second manual oil outlet valve and the first fuel inlet of the combustion chamber are connected through pipelines in sequence;

the other end of the second electric oil return valve, the second manual oil return valve and a second inlet of the fuel oil tank are connected through pipelines in sequence;

the second fuel flow meter and the second fuel supply pressure meter are arranged in a pipeline between the second manual oil outlet valve and the fuel inlet of the fuel gas heater and are respectively used for measuring the fuel flow and the oil pressure of the position where the second manual oil outlet valve and the fuel inlet of the fuel gas heater are positioned;

The outlet of the third fuel pump is respectively connected with one end of the third electric oil outlet valve and one end of the third electric oil return valve through pipelines;

the other end of the third electric oil outlet valve, the third manual oil outlet valve and the first fuel inlet of the combustion chamber are connected through pipelines in sequence;

the other end of the third electric oil return valve, the third manual oil return valve and a third inlet of the fuel oil tank are connected through pipelines in sequence;

the third fuel flow meter and the third fuel supply pressure meter are arranged in a pipeline between the third manual oil outlet valve and the fuel inlet of the fuel gas warmer and are respectively used for measuring the fuel flow and the oil pressure of the position where the third manual oil outlet valve and the fuel gas warmer are located.

As a further optimization scheme of the regulation and control system for the time-varying flow-down combustion research, the pipeline diameter of the first electric regulating valve adopts DN150, and the pipeline diameters of the second electric regulating valve and the third electric regulating valve adopt DN100.

The invention also discloses an air flow regulating method of the regulating system for the time-varying incoming flow combustion research, which comprises the following steps:

step A.1), setting a target air flow value by an operator;

step A.2), after the air flows through the air flowmeter, the air flowmeter measures the actual air flow in the pipeline in real time;

Step A.3), calculating a difference value between the actual air flow fed back by the air flow meter and a set target air flow value, and judging whether the difference value between the actual air flow and the target air flow value is larger than or equal to a preset first flow threshold value;

step A.3.1), if the difference value between the actual air flow and the target air flow value is greater than or equal to a preset difference threshold value, entering a coarse adjustment stage: controlling the opening of the first electric regulating valve to increase by a preset first opening threshold value;

step a.3.2), if the difference between the actual air flow and the target air flow is smaller than a preset difference threshold value, entering a fine tuning stage: controlling the opening of a second electric regulating valve to increase by a preset second opening threshold value, wherein the preset second opening threshold value is smaller than a preset first opening threshold value;

step a.4), repeating step a.3) until the difference between the actual air flow and the target air flow value is less than or equal to a preset second flow threshold.

The invention also discloses an air time-varying flow regulating method of the regulating system for time-varying incoming flow combustion research, which comprises the following steps:

step C.1), an air compressor is started, the first to sixth electric regulating valves and the manual flow regulating valve are closed, at the moment, air enters the pressure stabilizing tank, and the first pressure sensor measures the actual pressure value in the pressure stabilizing tank;

Step C.2), comparing the actual pressure value fed back by the first pressure sensor with a preset target pressure value;

step C.2.1), if the actual pressure value is smaller than the target pressure value and the difference value between the target pressure value and the actual pressure value is larger than a preset differential pressure threshold value, controlling a fifth regulating valve to reduce a preset fifth opening threshold value;

step C.2.2), if the actual pressure value is larger than the target pressure value and the difference value between the actual pressure value and the target pressure value is larger than a preset differential pressure threshold value, controlling a fifth regulating valve to increase a preset fifth opening threshold value;

step C.3), repeating the step 2) until the absolute value of the difference between the actual pressure value and the target pressure value is smaller than or equal to a preset differential pressure threshold value, and finishing pressure adjustment, wherein the preset fifth opening threshold value is 10%;

step C.4), calculating a difference value between the actual air flow fed back by the air flow meter and a preset target air flow value, and judging whether the difference value between the actual air flow and the target air flow value is larger than or equal to a preset first flow threshold value;

step C.4.1), if the difference value between the actual air flow and the target air flow value is greater than or equal to a preset difference threshold value, entering a coarse adjustment stage: controlling the opening of the first electric regulating valve to increase by a preset first opening threshold value;

Step c.4.2), if the difference between the actual air flow and the target air flow is smaller than a preset difference threshold value, entering a fine tuning stage: controlling the opening of a second electric regulating valve to increase by a preset second opening threshold value, wherein the preset second opening threshold value is smaller than a preset first opening threshold value;

step C.5), repeatedly executing the step C.4) until the difference value between the actual air flow and the target air flow value is smaller than or equal to a preset second flow threshold value, completing air flow adjustment, and obtaining and recording the static pressure, the total pressure and the temperature of the air through a second pressure sensor, a third pressure sensor and a temperature sensor;

step C.6), controlling a fifth electric regulating valve to increase a preset sixth opening threshold value, and realizing time-varying flow regulation in an acceleration process, wherein the preset second opening threshold value is 20%;

step C.7), obtaining the change of the static pressure, the total pressure and the temperature of the air through a second pressure sensor, a third pressure sensor and a temperature sensor, and calculating to obtain the actual change rate of the inlet air flow along with time by combining a gas state equation and a continuity equation;

step C.8), comparing a preset target pressure value with a maximum pressure value of the air compressor;

Step C.8.1), if the preset target pressure value is smaller than the maximum pressure value of the air compressor, comparing the calculated actual air flow rate and the target air flow rate value;

step C.8.1.1), if the actual air flow rate is smaller than the target air flow rate value and the difference between the target air flow rate value and the actual air flow rate is larger than the preset air flow rate difference threshold, adjusting the preset target pressure value to increase the preset first pressure threshold, and jumping to execute the step C.1);

step C.8.1.2), if the actual air flow rate is greater than the target air flow rate value and the difference between the actual air flow rate and the target air flow rate value is greater than the preset air flow rate difference threshold, adjusting the preset target pressure value to reduce the preset first pressure threshold, and jumping to execute the step C.1);

step C.8.2), if the preset target pressure value is greater than or equal to the maximum pressure value of the air compressor and the difference value between the actual air flow rate and the target air flow rate value is greater than the preset difference threshold value of the air flow rate, closing the fifth electric regulating valve, and performing time-varying regulation by adopting the third electric regulating valve:

Step C.8.2.1), adjusting a preset target pressure value to be smaller than the maximum pressure value of the air compressor;

step C.8.2.2), opening the air compressor, and closing the first to sixth electric regulating valves and the manual flow regulating valve;

step C.8.2.3), comparing the actual pressure value fed back by the first pressure sensor with a target pressure value;

step C.8.2.3.1), if the actual pressure value is smaller than the target pressure value and the difference value between the target pressure value and the actual pressure value is larger than a preset differential pressure threshold value, controlling the third regulating valve to reduce a preset seventh opening degree threshold value;

step C.8.2.3.2), if the actual pressure value is larger than the target pressure value and the difference value between the actual pressure value and the target pressure value is larger than a preset differential pressure threshold value, controlling the third regulating valve to increase a preset seventh opening degree threshold value;

step C.8.2.4), repeating the step C.8.2.3) until the absolute value of the difference between the actual pressure value and the target pressure value is less than or equal to a preset differential pressure threshold value, and completing pressure regulation, wherein the preset seventh opening degree threshold value is 10%;

step C.9), calculating a difference value between the actual air flow fed back by the air flow meter and a preset target air flow value, and judging whether the difference value between the actual air flow and the target air flow value is greater than or equal to a preset first flow threshold value;

Step C.9.1), if the difference value between the actual air flow and the target air flow value is greater than or equal to a preset difference threshold value, entering a coarse adjustment stage: controlling the opening of the first electric regulating valve to increase by a preset first opening threshold value;

step c.9.2), if the difference between the actual air flow and the target air flow is smaller than a preset difference threshold value, entering a fine tuning stage: controlling the opening of a second electric regulating valve to increase by a preset second opening threshold value, wherein the preset second opening threshold value is smaller than a preset first opening threshold value;

step c.10), repeatedly executing the step C.9) until the difference value between the actual air flow and the target air flow value is smaller than or equal to a preset second flow threshold value, completing air flow adjustment, and obtaining and recording the static pressure, the total pressure and the temperature of the air through a second pressure sensor, a third pressure sensor and a temperature sensor;

step C.11), controlling a third electric regulating valve, and increasing a preset sixth opening threshold value to realize time-varying flow regulation in the acceleration process;

step C.12), obtaining the change of the static pressure, the total pressure and the temperature of the air through a second pressure sensor, a third pressure sensor and a temperature sensor, and calculating to obtain the actual change rate of the inlet air flow along with time by combining a gas state equation and a continuity equation;

Step C.13), comparing the calculated actual air flow rate with a target air flow rate value;

step C.13.1), if the actual air flow rate is smaller than the target air flow rate value and the difference between the target air flow rate value and the actual air flow rate is larger than the preset air flow rate difference threshold, adjusting the preset target pressure value to increase the preset first pressure threshold, and jumping to execute the step C.8.2.2);

step c.13.2), if the actual air flow rate is greater than the target air flow rate value and the difference between the actual air flow rate and the target air flow rate value is greater than the preset air flow rate difference threshold, adjusting the preset target pressure value to reduce the preset first pressure threshold, and jumping to execute step c.8.2.2).

Compared with the prior art, the technical scheme provided by the invention has the following technical effects:

1. according to the invention, the upstream pressure of the pipeline can be stabilized through the pressure stabilizing tank, the time-varying incoming flow condition can be realized through the valve opening change of the electric regulating valve, and different time-varying flow change rates can be realized through regulating the pressure of the pressure stabilizing tank and changing the path of the branch;

2. The invention can realize the feedback control of the air flow, combines the air release branches with different diameters and the electric air release valve, automatically adjusts the target set value of the air flow value through PID control, and realizes the wide-range high-precision quick response adjustment of the air flow;

3. according to the invention, the oil way system for oil outlet and oil return control can be coupled, and the target set value of the fuel flow value is automatically adjusted through PID control, so that the quick response adjustment of the fuel flow is realized;

4. according to the invention, the time-varying regulation of the fuel flow can be realized through the oil way system which is coupled with the oil outlet and the oil return control, and the time-varying regulation of the fuel flow is coupled with the air flow regulation, so that the cooperative regulation of the fuel flow and the air flow is realized, and the oil-gas ratio of the fuel gas warmer can be kept unchanged in the time-varying regulation process, and the temperature in the time-varying regulation process is kept constant.

Drawings

FIG. 1 is a time-varying regulation system for a combustion test system of the present invention;

FIG. 2 is a regulating method for air flow regulation according to the present invention;

FIG. 3 is a method of regulating fuel flow according to the present invention;

FIG. 4 is a flow regulation method for air time-varying flow regulation according to the present invention;

FIG. 5 is a regulating method for the coordinated regulation of fuel flow and air flow according to the present invention;

In the figure, a 1-air compressor, a 2-surge tank, a 3-first pressure sensor, a 4-first electric regulating valve, a 5-second electric regulating valve, a 6-manual flow regulating valve, a 7-air flow meter, an 8-third electric regulating valve, a 9-500 ℃ grade electric heater, a 10-electric butterfly valve, a 11-fourth electric regulating valve, a 12-first safety valve, a 13-second safety valve, a 14-fifth electric regulating valve, a 15-200 ℃ grade electric heater, a 16-gas warmer, a 17-air blender, a 18-temperature sensor, a 19-second pressure sensor, a 20-third pressure sensor, a 21-combustion test section, a 22-vacuum tank, a 23-vacuum pressure gauge, a 24-sixth electric regulating valve, 25-vacuum pump, 26-fuel tank, 27-first fuel pump, 28-first electric outlet valve, 29-first manual outlet valve, 30-first electric return valve, 31-first manual return valve, 32-first fuel flow meter, 33-first oil supply pressure gauge, 34-second fuel pump, 35-second electric outlet valve, 36-second manual outlet valve, 37-second electric return valve, 38-second manual return valve, 39-second fuel flow meter, 40-second oil supply pressure gauge, 41-third fuel pump, 42-third electric return valve, 43-third manual outlet valve, 44-third electric return valve, 45-third manual return valve, 46-third fuel flow meter, 47-third oil supply pressure gauge.

Description of the embodiments

The technical scheme of the invention is further described in detail below with reference to the accompanying drawings:

this invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the components are exaggerated for clarity.

It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, components and/or sections, these elements, components and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, and/or section from another. Accordingly, a first element, component, and/or section discussed below could be termed a second element, component, or section without departing from the teachings of the present invention.

As shown in fig. 1, the invention discloses a regulation and control system for time-varying incoming flow combustion research, which comprises an air compressor, a surge tank, first to sixth electric regulating valves, a manual flow regulating valve, an air flowmeter, a 500 ℃ electric heater, an electric butterfly valve, first to second safety valves, a 200 ℃ electric heater, a gas warmer, an air blender, a temperature sensor, first to third pressure sensors, a combustion chamber, a vacuum tank, a vacuum pressure gauge, a vacuum pump, a fuel tank, first to third fuel pumps, first to third electric oil outlet valves, first to third manual oil outlet valves, first to third electric oil return valves, first to third manual oil return valves, first to third fuel flow meters and first to third oil supply pressure gauges;

The pressure stabilizing tank comprises an inlet, a pressure measuring point and an outlet;

the air blender comprises first to third inlets and an outlet, wherein the air is used for being blended by the first to third inlets and then discharged from the outlet;

the fuel gas warmer comprises an air inlet, an air outlet and a fuel oil inlet, and is used for heating air entering from the air inlet and then discharging the air from the air outlet;

the combustion chamber comprises an air inlet, an air outlet, a first fuel inlet and a second fuel inlet;

the fuel tank comprises first to third inlets and first to third outlets;

the vacuum tank comprises an air inlet, a pressure measuring point, a first air outlet and a second air outlet;

the inlet of the air compressor is connected with outside air, and the outlet of the air compressor is connected with an inlet pipeline of the pressure stabilizing tank;

the outlet of the pressure stabilizing tank is respectively connected with one end pipeline of a first electric regulating valve, a second electric regulating valve, a manual flow regulating valve and an air flowmeter, the other ends of the first electric regulating valve, the second electric regulating valve and the manual flow regulating valve are respectively connected with outside air, and the other ends of the air flowmeter are respectively connected with one end of a third electric regulating valve, one end of a fourth electric regulating valve, one end of a fifth electric regulating valve and an inlet pipeline of a second safety valve;

The first pressure sensor is arranged at a pressure measuring point of the pressure stabilizing tank;

the other end of the third electric regulating valve, the 500 ℃ electric heater and one end of the electric butterfly valve are connected in sequence through pipelines;

the other end of the electric butterfly valve is connected with a first inlet pipeline of the air blender;

the other end of the fourth electric regulating valve is respectively connected with the second inlet of the air blender and the inlet pipeline of the first safety valve;

the other end of the fifth electric regulating valve, the 200 ℃ level electric heater and the air inlet of the gas warmer are connected in a pipeline way in sequence;

the third inlet of the air blender is connected with the outlet pipeline of the gas warmer, and the outlet of the air blender is connected with the air inlet pipeline of the combustion chamber;

the temperature sensor, the second pressure sensor and the third pressure sensor are all arranged in a pipeline between the outlet of the air blender and the air inlet of the combustion chamber, wherein the temperature sensor is used for measuring the temperature of the position where the temperature sensor is located, the second pressure sensor is used for measuring the static pressure of the position where the temperature sensor is located, and the third pressure sensor is used for measuring the total pressure of the position where the temperature sensor is located;

the air inlet of the vacuum tank is connected with an air outlet pipeline of the combustion chamber, the first air outlet is connected with one end pipeline of the sixth electric regulating valve, and the second air outlet is connected with one end pipeline of the vacuum pump;

The other end of the sixth electric regulating valve and the other end of the vacuum pump are connected with outside air;

the vacuum pressure gauge is arranged at a pressure measuring point of the vacuum tank and is used for measuring the pressure in the vacuum tank;

the first to third outlets of the fuel oil tank are respectively connected with inlets of the first to third fuel pumps in one-to-one correspondence;

the outlet of the first fuel pump is respectively connected with one end of the first electric oil outlet valve and one end of the first electric oil return valve through pipelines;

the other end of the first electric oil outlet valve, the first manual oil outlet valve and the fuel inlet of the fuel gas heater are connected through pipelines in sequence;

the other end of the first electric oil return valve, the first manual oil return valve and a first inlet of the fuel oil tank are connected through pipelines in sequence;

the first fuel flow meter and the first fuel supply pressure meter are arranged in a pipeline between the first manual oil outlet valve and the fuel inlet of the fuel gas heater and are respectively used for measuring the fuel flow and the oil pressure of the position where the first manual oil outlet valve and the fuel inlet of the fuel gas heater are positioned;

the outlet of the second fuel pump is respectively connected with one end of the second electric oil outlet valve and one end of the second electric oil return valve through pipelines;

the other end of the second electric oil outlet valve, the second manual oil outlet valve and the first fuel inlet of the combustion chamber are connected through pipelines in sequence;

The other end of the second electric oil return valve, the second manual oil return valve and a second inlet of the fuel oil tank are connected through pipelines in sequence;

the second fuel flow meter and the second fuel supply pressure meter are arranged in a pipeline between the second manual oil outlet valve and the fuel inlet of the fuel gas heater and are respectively used for measuring the fuel flow and the oil pressure of the position where the second manual oil outlet valve and the fuel inlet of the fuel gas heater are positioned;

the outlet of the third fuel pump is respectively connected with one end of the third electric oil outlet valve and one end of the third electric oil return valve through pipelines;

the other end of the third electric oil outlet valve, the third manual oil outlet valve and the first fuel inlet of the combustion chamber are connected through pipelines in sequence;

the other end of the third electric oil return valve, the third manual oil return valve and a third inlet of the fuel oil tank are connected through pipelines in sequence;

the third fuel flow meter and the third fuel supply pressure meter are arranged in a pipeline between the third manual oil outlet valve and the fuel inlet of the fuel gas warmer and are respectively used for measuring the fuel flow and the oil pressure of the position where the third manual oil outlet valve and the fuel gas warmer are located.

Air compressed by the air compressor enters the pressure stabilizing tank to keep the upstream pressure stable; three regulating valves for regulating the total flow of the test pipeline are arranged behind the pressure stabilizing tank, and then an air flowmeter capable of feeding back flow signals is arranged; after the air flow meter, the test main pipeline is divided into three different branches, mixing is carried out in the air mixer, uniformity of air flow entering the combustion chamber is guaranteed, a temperature sensor, a second pressure sensor and a third pressure sensor are arranged between the combustion chamber and the air mixer, and a measurement and control system collects sensor signals to realize monitoring of a combustion process; a vacuum tank is arranged behind the combustion chamber to stabilize the outlet pressure, and is communicated with a vacuum pump and used for creating a vacuum environment required by a combustion test; the vacuum tank is provided with a vacuum pressure gauge and a sixth electric regulating valve, and the pressure in the vacuum tank is regulated through the electric regulating valve, and the vacuum pressure gauge displays the vacuum degree in the tank in real time.

The first electric regulating valve is used for rough adjustment of the flow, and the second electric regulating valve is used for fine adjustment of the flow; the air flowmeter is used for measuring the total flow in a test pipeline of the system; the first electric regulating valve and the second electric regulating valve can be controlled according to the set flow value, so that flow closed-loop control is realized;

the 500 ℃ electric heater can heat the gas to 500 ℃ at the highest; the electric butterfly valve is arranged behind the 500 ℃ electric heater and is communicated with other test tables and used for preventing interference with the combustion chamber; the 200 ℃ -grade electric heater can heat the gas to 200 ℃ at most; the gas warmer can heat the gas to 800 ℃ at the highest;

DN150 is adopted in the pipeline path of the first electric regulating valve preferentially, so that a larger time-varying flow rate change can be regulated and realized; DN100 is adopted in the pipeline path of the third electric regulating valve preferentially, so that the smaller time-varying flow rate change can be regulated and realized; the second electric regulating valve and the third electric regulating valve have the same parameters, and the measurement and control system synchronously controls the two valves under the same heating power and the same gas-oil ratio of the gas warmer, so that the time-varying regulation and control of the temperature are realized.

Regulating the fuel flow by adopting a first electric oil outlet valve, a second electric oil outlet valve and a third electric oil return valve which are coupled, and using a first fuel flowmeter, a second fuel flowmeter and a third fuel flowmeter to measure the flow and feed back signals; and the first to third electric oil outlet valves and the first to third electric oil return valves are regulated according to the feedback signals, and the quick response regulation of the fuel flow is realized through PID control.

The first fuel pump, the first electric oil outlet valve, the first manual oil outlet valve, the first electric oil return valve, the first manual oil return valve, the first fuel flow meter and the first oil supply pressure meter form a first oil circuit system; the second fuel pump, the second electric oil outlet valve, the second manual oil outlet valve, the second electric oil return valve, the second manual oil return valve, the second fuel flow meter and the second oil supply pressure gauge form a second oil circuit system; the third fuel pump, the third electric oil outlet valve, the third manual oil outlet valve, the third electric oil return valve, the third manual oil return valve, the third fuel flow meter and the third oil supply pressure gauge form a third oil circuit system.

The first oil way system supplies oil to the fuel gas warmer; when the system flow signal changes, the required fuel flow is calculated according to the preset oil-gas ratio, and quick response adjustment is performed, so that the cooperative adjustment of the fuel flow and the air flow is realized, and the constant oil-gas ratio in the fuel gas warmer is ensured.

The second oil circuit system and the third oil circuit system are used for supplying oil to the test section combustion chamber in a grading and subarea manner; the control system calculates the required fuel flow according to the set oil-gas ratio and the partition oil supply proportion, and realizes the cooperative regulation of the fuel flow.

The adjusting speeds of the first to third electric oil outlet valves and the first to third electric oil return valves can be controlled by programming; different fuel flow rate change rates are realized by different combinations of the adjustment speeds; before use, the fuel flow rate change rate is calibrated for the fuel supply system; calculating a fuel flow change curve under a specific time-varying flow change rate; and combining the calibration result, programming to give out the adjustment rates of the first to third electric oil valves and the first to third electric oil return valves, and realizing the cooperative adjustment of the fuel flow and the air flow.

The oil circuit system works in the following way: the measurement and control system respectively sets the fuel flow value of each oil way, and adjusts the opening of the oil outlet valve and the oil return valve by PID control according to the fuel flow signal fed back by the flowmeter, so as to realize closed-loop control.

The first oil way system is used for supplying oil to the gas warmer and can be used for adjusting the temperature condition of the inlet of the test section, when the air flow is changed, the change of the fuel flow is adjusted according to the change of the air flow, the oil-gas ratio in the gas warmer is kept unchanged, and when the incoming flow is in a time-varying flow condition, the temperature condition is kept unchanged by the adjusting method; the opening degree adjustment of the fourth electric adjusting valve and the fifth electric adjusting valve is matched, so that the time-varying adjustment and control of the temperature of the test pipeline can be realized under the condition that the flow is unchanged.

The vacuum tank is arranged behind the air outlet of the combustion chamber, the vacuum tank is connected with the vacuum pump and the sixth electric regulating valve, the opening of the sixth electric regulating valve is precisely controlled according to the calculation error of the measurement and control system and the pressure signal fed back by the second pressure sensor at the inlet of the combustion chamber, and the negative pressure in the vacuum tank is finely adjusted in real time, so that the time-varying regulation and control of the inlet pressure of the combustion chamber are realized.

The air flow rate is adjusted by the adjusting method shown in fig. 2. The specific operation steps are as follows:

Step A.1), the operator sets a target air flow value, for example 0.5kg/s;

step A.2), after the air flows through the air flow meter, the air flow meter measures the actual air flow in the pipeline in real time, for example, 0.3kg/s;

step A.3), calculating a difference value between the actual air flow fed back by the air flow meter and a set target air flow value, and judging whether the difference value between the actual air flow and the target air flow value is larger than or equal to a preset first flow threshold value, wherein the preset flow threshold value in the embodiment is 0.1kg/s;

step A.3.1), if the difference value between the actual air flow and the target air flow value is greater than or equal to a preset difference threshold value, entering a coarse adjustment stage: controlling the opening of the first electric regulating valve to increase by a preset first opening threshold value, wherein the preset first opening threshold value adopts 20 percent;

step A.3.1), if the difference value between the actual air flow and the target air flow value is smaller than a preset difference threshold value, entering a fine tuning stage: controlling the opening of the second electric regulating valve to increase by a preset second opening threshold value, wherein the preset second opening threshold value is smaller than the preset first opening threshold value, and the preset second opening threshold value adopts 2% in the embodiment;

step A.4), repeating the step A.3) until the difference value between the actual air flow and the target air flow value is smaller than or equal to a preset second flow threshold value, stopping adjusting the first and second electric regulating valves at the moment, and completing an automatic closed-loop control process; the preset flow rate threshold in this example was 0.01kg/s.

The fuel flow is regulated by the regulating method shown in fig. 3. The adjustment methods of the three oil way systems in the system are the same, and the specific operation steps are as follows, taking the first oil way system as an example:

and B.1), checking the initial state of the oil way system, and ensuring that the first electric oil return valve is in a fully opened state and the first electric oil outlet valve is in a fully closed state.

And B.2), after the first fuel pump is opened, fuel oil enters the fuel pump from the fuel tank, and then completely flows back to the fuel tank through the oil return valve and the oil return pipeline to form oil circuit circulation, and at the moment, the fuel oil flow in the oil outlet pipeline is zero.

Step B.3), the operator sets a target fuel flow value, for example 10g/s.

Step b.4), a small opening, such as 2%, is given to the first electric outlet valve, and the first electric outlet valve, the first electric return valve, the first fuel flowmeter and the corresponding pipeline are filled with fuel, and after the fuel flows through the first fuel flowmeter, the real-time fuel flow is measured, for example, 2g/s.

And B.5), calculating a difference value between the actual fuel flow fed back by the first fuel flow meter and the set target fuel flow, and controlling the opening of the first electric oil outlet valve to increase by a preset third opening threshold value, wherein the preset third opening threshold value is 20%.

Step B.6), repeating the step B.5) until the difference value between the actual fuel flow and the target fuel flow is smaller than or equal to a preset fuel flow threshold value, and at the moment, keeping the opening of the first electric oil outlet valve unchanged to complete the automatic closed-loop control process of the fuel flow; the preset fuel flow threshold in this example is 0.01g/s.

Step B.7), if the opening of the first electric outlet valve has reached the maximum, the difference between the actual fuel flow and the target fuel flow is still greater than the fuel flow threshold, for example, the difference between the actual fuel flow and the target fuel flow is 2g/s when the first electric outlet valve is fully opened in this example, and the oil return control stage is entered.

Step B.8), according to the difference between the actual fuel flow and the target fuel flow, controlling the opening of the first electric oil return valve to reduce by a preset fourth threshold, wherein the preset fourth threshold is 5%.

Step B.9), repeating the step B.8) until the difference value between the actual fuel flow and the target fuel flow is smaller than or equal to a preset fuel flow threshold value, and keeping the opening of the first electric oil return valve unchanged at the moment to complete the automatic closed-loop control process of the fuel flow; the preset fuel flow threshold in this example is 0.01g/s.

The time-varying flow rate adjustment of air is performed by the adjustment method shown in fig. 4.

Before the time-varying flow rate of air is regulated, the relation between the air flow rate and the pressure of the surge tank is required to be calibrated, and the specific operation steps of the calibration are as follows:

step C.1), an air compressor is started, the first to sixth electric regulating valves and the manual flow regulating valve are closed, at the moment, air enters the pressure stabilizing tank, and the first pressure sensor measures the actual pressure value in the pressure stabilizing tank;

step C.2), comparing the actual pressure value fed back by the first pressure sensor with a preset target pressure value;

step C.2.1), if the actual pressure value is smaller than the target pressure value and the difference value between the target pressure value and the actual pressure value is larger than a preset differential pressure threshold value, controlling a fifth regulating valve to reduce a preset fifth opening threshold value;

step C.2.2), if the actual pressure value is larger than the target pressure value and the difference value between the actual pressure value and the target pressure value is larger than a preset differential pressure threshold value, controlling a fifth regulating valve to increase a preset fifth opening threshold value;

step C.3), repeating the step 2) until the absolute value of the difference between the actual pressure value and the target pressure value is smaller than or equal to a preset differential pressure threshold value, and finishing pressure adjustment, wherein the preset fifth opening threshold value is 10%;

Step C.4), calculating a difference value between the actual air flow fed back by the air flow meter and a preset target air flow value, and judging whether the difference value between the actual air flow and the target air flow value is larger than or equal to a preset first flow threshold value;

step C.4.1), if the difference value between the actual air flow and the target air flow value is greater than or equal to a preset difference threshold value, entering a coarse adjustment stage: controlling the opening of the first electric regulating valve to increase by a preset first opening threshold value;

step c.4.2), if the difference between the actual air flow and the target air flow is smaller than a preset difference threshold value, entering a fine tuning stage: controlling the opening of a second electric regulating valve to increase by a preset second opening threshold value, wherein the preset second opening threshold value is smaller than a preset first opening threshold value;

step C.5), repeatedly executing the step C.4) until the difference value between the actual air flow and the target air flow value is smaller than or equal to a preset second flow threshold value, completing air flow adjustment, and obtaining and recording the static pressure, the total pressure and the temperature of the air through a second pressure sensor, a third pressure sensor and a temperature sensor;

step C.6), controlling a fifth electric regulating valve to increase a preset sixth opening threshold value, and realizing time-varying flow regulation in an acceleration process, wherein the preset second opening threshold value is 20%;

Step C.7), obtaining the change of the static pressure, the total pressure and the temperature of the air through a second pressure sensor, a third pressure sensor and a temperature sensor, and calculating to obtain the actual change rate of the inlet air flow along with time by combining a gas state equation and a continuity equation;

step C.8), comparing a preset target pressure value with a maximum pressure value of the air compressor;

step C.8.1), if the preset target pressure value is smaller than the maximum pressure value of the air compressor, comparing the calculated actual air flow rate and the target air flow rate value;

step C.8.1.1), if the actual air flow rate is smaller than the target air flow rate value and the difference between the target air flow rate value and the actual air flow rate is larger than the preset air flow rate difference threshold, adjusting the preset target pressure value to increase the preset first pressure threshold, and jumping to execute the step C.1);

step C.8.1.2), if the actual air flow rate is greater than the target air flow rate value and the difference between the actual air flow rate and the target air flow rate value is greater than the preset air flow rate difference threshold, adjusting the preset target pressure value to reduce the preset first pressure threshold, and jumping to execute the step C.1);

Step C.8.2), if the preset target pressure value is greater than or equal to the maximum pressure value of the air compressor and the difference value between the actual air flow rate and the target air flow rate value is greater than the preset difference threshold value of the air flow rate, closing the fifth electric regulating valve, and performing time-varying regulation by adopting the third electric regulating valve:

step C.8.2.1), adjusting a preset target pressure value to be smaller than the maximum pressure value of the air compressor;

step C.8.2.2), opening the air compressor, and closing the first to sixth electric regulating valves and the manual flow regulating valve;

step C.8.2.3), comparing the actual pressure value fed back by the first pressure sensor with a target pressure value;

step C.8.2.3.1), if the actual pressure value is smaller than the target pressure value and the difference value between the target pressure value and the actual pressure value is larger than a preset differential pressure threshold value, controlling the third regulating valve to reduce a preset seventh opening degree threshold value;

step C.8.2.3.2), if the actual pressure value is larger than the target pressure value and the difference value between the actual pressure value and the target pressure value is larger than a preset differential pressure threshold value, controlling the third regulating valve to increase a preset seventh opening degree threshold value;

step C.8.2.4), repeating the step C.8.2.3) until the absolute value of the difference between the actual pressure value and the target pressure value is less than or equal to a preset differential pressure threshold value, and completing pressure regulation, wherein the preset seventh opening degree threshold value is 10%;

Step C.9), calculating a difference value between the actual air flow fed back by the air flow meter and a preset target air flow value, and judging whether the difference value between the actual air flow and the target air flow value is greater than or equal to a preset first flow threshold value;

step C.9.1), if the difference value between the actual air flow and the target air flow value is greater than or equal to a preset difference threshold value, entering a coarse adjustment stage: controlling the opening of the first electric regulating valve to increase by a preset first opening threshold value;

step c.9.2), if the difference between the actual air flow and the target air flow is smaller than a preset difference threshold value, entering a fine tuning stage: controlling the opening of a second electric regulating valve to increase by a preset second opening threshold value, wherein the preset second opening threshold value is smaller than a preset first opening threshold value;

step c.10), repeatedly executing the step C.9) until the difference value between the actual air flow and the target air flow value is smaller than or equal to a preset second flow threshold value, completing air flow adjustment, and obtaining and recording the static pressure, the total pressure and the temperature of the air through a second pressure sensor, a third pressure sensor and a temperature sensor;

step C.11), controlling a third electric regulating valve, and increasing a preset sixth opening threshold value to realize time-varying flow regulation in the acceleration process;

Step C.12), obtaining the change of the static pressure, the total pressure and the temperature of the air through a second pressure sensor, a third pressure sensor and a temperature sensor, and calculating to obtain the actual change rate of the inlet air flow along with time by combining a gas state equation and a continuity equation;

step C.13), comparing the calculated actual air flow rate with a target air flow rate value;

step C.13.1), if the actual air flow rate is smaller than the target air flow rate value and the difference between the target air flow rate value and the actual air flow rate is larger than the preset air flow rate difference threshold, adjusting the preset target pressure value to increase the preset first pressure threshold, and jumping to execute the step C.8.2.2);

step c.13.2), if the actual air flow rate is greater than the target air flow rate value and the difference between the actual air flow rate and the target air flow rate value is greater than the preset air flow rate difference threshold, adjusting the preset target pressure value to reduce the preset first pressure threshold, and jumping to execute step c.8.2.2).

After the steps are finished, the relation between the pressure and the air flow change rate can be arranged into curves for the fifth electric regulating valve and the third electric regulating valve respectively, and the pressure of the surge tank can be determined according to the air flow change rate required by the experiment before the experiment.

The adjustment method shown in fig. 5 is used to cooperatively adjust the fuel flow and the air flow. The specific operation steps are as follows:

setting a target inlet temperature in the measurement and control system, for example, 500 ℃;

air flow adjustment is performed in a manner referring to fig. 2, controlling the air flow to an initial flow, for example 0.5kg/s;

performing fuel flow adjustment of the first oil path system in a manner referring to fig. 3, giving an initial fuel flow, igniting the fuel warmer by using the igniter, measuring a real-time temperature, such as 400 ℃, by using the temperature sensor, and calculating a difference between the actual temperature and a target temperature;

gradually increasing the fuel flow value in the measurement and control system, regulating the fuel flow in a mode of referring to FIG. 3, measuring the temperature in real time and feeding back to the measurement and control system until the temperature reaches a set target value, recording the fuel flow and air flow at the moment and calculating the oil-gas ratio;

performing time-varying adjustment of air flow in a manner referring to fig. 4, wherein the incoming flow enters a time-varying flow stage, and the air flow continuously changes with time to form an air flow characteristic curve;

according to the air flow at different moments and the oil-gas ratio calculated previously, calculating corresponding fuel flow to obtain a fuel flow change curve;

The flow control module adjusts the opening of the first electric oil outlet valve and the opening of the first electric oil return valve in real time according to a fuel flow change curve to control the change of fuel flow;

with the cooperative time variation of the air and fuel flows, the heating value of the heater is kept constant as the gas-oil ratio is kept constant.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

While the foregoing is directed to embodiments of the present invention, other and further details of the invention may be had by the present invention, it should be understood that the foregoing description is merely illustrative of the present invention and that no limitations are intended to the scope of the invention, except insofar as modifications, equivalents, improvements or modifications are within the spirit and principles of the invention.

Claims (4)

1. The regulation and control system for the time-varying flow down-flow combustion research is characterized by comprising an air compressor, a surge tank, first to sixth electric regulating valves, a manual flow regulating valve, an air flowmeter, a 500 ℃ electric heater, an electric butterfly valve, first to second safety valves, a 200 ℃ electric heater, a gas warmer, an air blender, a temperature sensor, first to third pressure sensors, a combustion chamber, a vacuum tank, a vacuum pressure gauge, a vacuum pump, a fuel tank, first to third fuel pumps, first to third electric oil outlet valves, first to third manual oil outlet valves, first to third electric oil return valves, first to third manual oil return valves, first to third fuel flow meters and first to third oil supply pressure gauges;

the pressure stabilizing tank comprises an inlet, a pressure measuring point and an outlet;

the air blender comprises first to third inlets and an outlet, wherein the air is used for being blended by the first to third inlets and then discharged from the outlet;

the fuel gas warmer comprises an air inlet, an air outlet and a fuel oil inlet, and is used for heating air entering from the air inlet and then discharging the air from the air outlet;

The combustion chamber comprises an air inlet, an air outlet, a first fuel inlet and a second fuel inlet;

the fuel tank comprises first to third inlets and first to third outlets;

the vacuum tank comprises an air inlet, a pressure measuring point, a first air outlet and a second air outlet;

the inlet of the air compressor is connected with outside air, and the outlet of the air compressor is connected with an inlet pipeline of the pressure stabilizing tank;

the outlet of the pressure stabilizing tank is respectively connected with one end pipeline of a first electric regulating valve, a second electric regulating valve, a manual flow regulating valve and an air flowmeter, the other ends of the first electric regulating valve, the second electric regulating valve and the manual flow regulating valve are respectively connected with outside air, and the other ends of the air flowmeter are respectively connected with one end of a third electric regulating valve, one end of a fourth electric regulating valve, one end of a fifth electric regulating valve and an inlet pipeline of a second safety valve;

the first pressure sensor is arranged at a pressure measuring point of the pressure stabilizing tank;

the other end of the third electric regulating valve, the 500 ℃ electric heater and one end of the electric butterfly valve are connected in sequence through pipelines;

the other end of the electric butterfly valve is connected with a first inlet pipeline of the air blender;

The other end of the fourth electric regulating valve is respectively connected with the second inlet of the air blender and the inlet pipeline of the first safety valve;

the other end of the fifth electric regulating valve, the 200 ℃ level electric heater and the air inlet of the gas warmer are connected in a pipeline way in sequence;

the third inlet of the air blender is connected with the outlet pipeline of the gas warmer, and the outlet of the air blender is connected with the air inlet pipeline of the combustion chamber;

the temperature sensor, the second pressure sensor and the third pressure sensor are all arranged in a pipeline between the outlet of the air blender and the air inlet of the combustion chamber, wherein the temperature sensor is used for measuring the temperature of the position where the temperature sensor is located, the second pressure sensor is used for measuring the static pressure of the position where the temperature sensor is located, and the third pressure sensor is used for measuring the total pressure of the position where the temperature sensor is located;

the air inlet of the vacuum tank is connected with an air outlet pipeline of the combustion chamber, the first air outlet is connected with one end pipeline of the sixth electric regulating valve, and the second air outlet is connected with one end pipeline of the vacuum pump;

the other end of the sixth electric regulating valve and the other end of the vacuum pump are connected with outside air;

the vacuum pressure gauge is arranged at a pressure measuring point of the vacuum tank and is used for measuring the pressure in the vacuum tank;

The first to third outlets of the fuel oil tank are respectively connected with inlets of the first to third fuel pumps in one-to-one correspondence;

the outlet of the first fuel pump is respectively connected with one end of the first electric oil outlet valve and one end of the first electric oil return valve through pipelines;

the other end of the first electric oil outlet valve, the first manual oil outlet valve and the fuel inlet of the fuel gas heater are connected through pipelines in sequence;

the other end of the first electric oil return valve, the first manual oil return valve and a first inlet of the fuel oil tank are connected through pipelines in sequence;

the first fuel flow meter and the first fuel supply pressure meter are arranged in a pipeline between the first manual oil outlet valve and the fuel inlet of the fuel gas heater and are respectively used for measuring the fuel flow and the oil pressure of the position where the first manual oil outlet valve and the fuel inlet of the fuel gas heater are positioned;

the outlet of the second fuel pump is respectively connected with one end of the second electric oil outlet valve and one end of the second electric oil return valve through pipelines;

the other end of the second electric oil outlet valve, the second manual oil outlet valve and the first fuel inlet of the combustion chamber are connected through pipelines in sequence;

the other end of the second electric oil return valve, the second manual oil return valve and a second inlet of the fuel oil tank are connected through pipelines in sequence;

the second fuel flow meter and the second fuel supply pressure meter are arranged in a pipeline between the second manual oil outlet valve and the fuel inlet of the fuel gas heater and are respectively used for measuring the fuel flow and the oil pressure of the position where the second manual oil outlet valve and the fuel inlet of the fuel gas heater are positioned;

The outlet of the third fuel pump is respectively connected with one end of the third electric oil outlet valve and one end of the third electric oil return valve through pipelines;

the other end of the third electric oil outlet valve, the third manual oil outlet valve and the first fuel inlet of the combustion chamber are connected through pipelines in sequence;

the other end of the third electric oil return valve, the third manual oil return valve and a third inlet of the fuel oil tank are connected through pipelines in sequence;

the third fuel flow meter and the third fuel supply pressure meter are arranged in a pipeline between the third manual oil outlet valve and the fuel inlet of the fuel gas warmer and are respectively used for measuring the fuel flow and the oil pressure of the position where the third manual oil outlet valve and the fuel gas warmer are located.

2. The regulation and control system for time-varying incoming flow combustion studies of claim 1, wherein the first electrically operated regulator valve has a line path of DN150 and the second and third electrically operated regulator valves have a line path of DN100.

3. Air flow regulation method based on a regulation system for time-varying incoming flow combustion studies according to claim 1, characterized by comprising the steps of:

step A.1), setting a target air flow value by an operator;

step A.2), after the air flows through the air flowmeter, the air flowmeter measures the actual air flow in the pipeline in real time;

Step A.3), calculating a difference value between the actual air flow fed back by the air flow meter and a set target air flow value, and judging whether the difference value between the actual air flow and the target air flow value is larger than or equal to a preset first flow threshold value;

step A.3.1), if the difference value between the actual air flow and the target air flow value is greater than or equal to a preset difference threshold value, entering a coarse adjustment stage: controlling the opening of the first electric regulating valve to increase by a preset first opening threshold value;

step a.3.2), if the difference between the actual air flow and the target air flow is smaller than a preset difference threshold value, entering a fine tuning stage: controlling the opening of a second electric regulating valve to increase by a preset second opening threshold value, wherein the preset second opening threshold value is smaller than a preset first opening threshold value;

step a.4), repeating step a.3) until the difference between the actual air flow and the target air flow value is less than or equal to a preset second flow threshold.

4. An air time-varying flow regulation method based on a regulation system for time-varying incoming flow combustion studies as claimed in claim 1, characterized by comprising the steps of:

step C.1), an air compressor is started, the first to sixth electric regulating valves and the manual flow regulating valve are closed, at the moment, air enters the pressure stabilizing tank, and the first pressure sensor measures the actual pressure value in the pressure stabilizing tank;

Step C.2), comparing the actual pressure value fed back by the first pressure sensor with a preset target pressure value;

step C.2.1), if the actual pressure value is smaller than the target pressure value and the difference value between the target pressure value and the actual pressure value is larger than a preset differential pressure threshold value, controlling a fifth regulating valve to reduce a preset fifth opening threshold value;

step C.2.2), if the actual pressure value is larger than the target pressure value and the difference value between the actual pressure value and the target pressure value is larger than a preset differential pressure threshold value, controlling a fifth regulating valve to increase a preset fifth opening threshold value;

step C.3), repeating the step 2) until the absolute value of the difference between the actual pressure value and the target pressure value is smaller than or equal to a preset differential pressure threshold value, and finishing pressure adjustment, wherein the preset fifth opening threshold value is 10%;

step C.4), calculating a difference value between the actual air flow fed back by the air flow meter and a preset target air flow value, and judging whether the difference value between the actual air flow and the target air flow value is larger than or equal to a preset first flow threshold value;

step C.4.1), if the difference value between the actual air flow and the target air flow value is greater than or equal to a preset difference threshold value, entering a coarse adjustment stage: controlling the opening of the first electric regulating valve to increase by a preset first opening threshold value;

Step c.4.2), if the difference between the actual air flow and the target air flow is smaller than a preset difference threshold value, entering a fine tuning stage: controlling the opening of a second electric regulating valve to increase by a preset second opening threshold value, wherein the preset second opening threshold value is smaller than a preset first opening threshold value;

step C.5), repeatedly executing the step C.4) until the difference value between the actual air flow and the target air flow value is smaller than or equal to a preset second flow threshold value, completing air flow adjustment, and obtaining and recording the static pressure, the total pressure and the temperature of the air through a second pressure sensor, a third pressure sensor and a temperature sensor;

step C.6), controlling a fifth electric regulating valve to increase a preset sixth opening threshold value, and realizing time-varying flow regulation in an acceleration process, wherein the preset second opening threshold value is 20%;

step C.7), obtaining the change of the static pressure, the total pressure and the temperature of the air through a second pressure sensor, a third pressure sensor and a temperature sensor, and calculating to obtain the actual change rate of the inlet air flow along with time by combining a gas state equation and a continuity equation;

step C.8), comparing a preset target pressure value with a maximum pressure value of the air compressor;

Step C.8.1), if the preset target pressure value is smaller than the maximum pressure value of the air compressor, comparing the calculated actual air flow rate and the target air flow rate value;

step C.8.1.1), if the actual air flow rate is smaller than the target air flow rate value and the difference between the target air flow rate value and the actual air flow rate is larger than the preset air flow rate difference threshold, adjusting the preset target pressure value to increase the preset first pressure threshold, and jumping to execute the step C.1);

step C.8.1.2), if the actual air flow rate is greater than the target air flow rate value and the difference between the actual air flow rate and the target air flow rate value is greater than the preset air flow rate difference threshold, adjusting the preset target pressure value to reduce the preset first pressure threshold, and jumping to execute the step C.1);

step C.8.2), if the preset target pressure value is greater than or equal to the maximum pressure value of the air compressor and the difference value between the actual air flow rate and the target air flow rate value is greater than the preset difference threshold value of the air flow rate, closing the fifth electric regulating valve, and performing time-varying regulation by adopting the third electric regulating valve:

Step C.8.2.1), adjusting a preset target pressure value to be smaller than the maximum pressure value of the air compressor;

step C.8.2.2), opening the air compressor, and closing the first to sixth electric regulating valves and the manual flow regulating valve;

step C.8.2.3), comparing the actual pressure value fed back by the first pressure sensor with a target pressure value;

step C.8.2.3.1), if the actual pressure value is smaller than the target pressure value and the difference value between the target pressure value and the actual pressure value is larger than a preset differential pressure threshold value, controlling the third regulating valve to reduce a preset seventh opening degree threshold value;

step C.8.2.3.2), if the actual pressure value is larger than the target pressure value and the difference value between the actual pressure value and the target pressure value is larger than a preset differential pressure threshold value, controlling the third regulating valve to increase a preset seventh opening degree threshold value;

step C.8.2.4), repeating the step C.8.2.3) until the absolute value of the difference between the actual pressure value and the target pressure value is less than or equal to a preset differential pressure threshold value, and completing pressure regulation, wherein the preset seventh opening degree threshold value is 10%;

step C.9), calculating a difference value between the actual air flow fed back by the air flow meter and a preset target air flow value, and judging whether the difference value between the actual air flow and the target air flow value is greater than or equal to a preset first flow threshold value;

Step C.9.1), if the difference value between the actual air flow and the target air flow value is greater than or equal to a preset difference threshold value, entering a coarse adjustment stage: controlling the opening of the first electric regulating valve to increase by a preset first opening threshold value;

step c.9.2), if the difference between the actual air flow and the target air flow is smaller than a preset difference threshold value, entering a fine tuning stage: controlling the opening of a second electric regulating valve to increase by a preset second opening threshold value, wherein the preset second opening threshold value is smaller than a preset first opening threshold value;

step c.10), repeatedly executing the step C.9) until the difference value between the actual air flow and the target air flow value is smaller than or equal to a preset second flow threshold value, completing air flow adjustment, and obtaining and recording the static pressure, the total pressure and the temperature of the air through a second pressure sensor, a third pressure sensor and a temperature sensor;

step C.11), controlling a third electric regulating valve, and increasing a preset sixth opening threshold value to realize time-varying flow regulation in the acceleration process;

step C.12), obtaining the change of the static pressure, the total pressure and the temperature of the air through a second pressure sensor, a third pressure sensor and a temperature sensor, and calculating to obtain the actual change rate of the inlet air flow along with time by combining a gas state equation and a continuity equation;

Step C.13), comparing the calculated actual air flow rate with a target air flow rate value;

step C.13.1), if the actual air flow rate is smaller than the target air flow rate value and the difference between the target air flow rate value and the actual air flow rate is larger than the preset air flow rate difference threshold, adjusting the preset target pressure value to increase the preset first pressure threshold, and jumping to execute the step C.8.2.2);

step c.13.2), if the actual air flow rate is greater than the target air flow rate value and the difference between the actual air flow rate and the target air flow rate value is greater than the preset air flow rate difference threshold, adjusting the preset target pressure value to reduce the preset first pressure threshold, and jumping to execute step c.8.2.2).