CN111734534A - Engine fuel supply flow control system and control method thereof - Google Patents
Engine fuel supply flow control system and control method thereof Download PDFInfo
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- CN111734534A CN111734534A CN202010527591.3A CN202010527591A CN111734534A CN 111734534 A CN111734534 A CN 111734534A CN 202010527591 A CN202010527591 A CN 202010527591A CN 111734534 A CN111734534 A CN 111734534A
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- supply flow
- orifice
- flow control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C9/00—Controlling gas-turbine plants; Controlling fuel supply in air- breathing jet-propulsion plants
- F02C9/26—Control of fuel supply
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C9/00—Controlling gas-turbine plants; Controlling fuel supply in air- breathing jet-propulsion plants
- F02C9/26—Control of fuel supply
- F02C9/32—Control of fuel supply characterised by throttling of fuel
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Flow Control (AREA)
Abstract
The invention discloses an engine fuel supply flow control system and a control method thereof, wherein the control method comprises the following steps: the method comprises the following steps of arranging a proportional valve and an orifice on an oil pipeline, and controlling the output of supply flow by regulating the pressure difference between the front end and the rear end of the orifice through the proportional valve, wherein the calculation formula of the supply flow is as follows:
wherein Q is the supply flow rate through the orifice; a is the throttle area of the throttle hole; cd is a flow coefficient; rho is the fuel density; the differential pressure Δ P is therefore the differential pressure across the orifice. The engine fuel supply flow control method provided by the invention is proved by test and verification that the supply flow control relation adopting the control method completely accords with the control rule, and has good operability and accuracy; the control system has simple structure and design, relatively low cost and can treat pollutantsA less sensitive flow control system is required, and the method has good popularization and application values.
Description
Technical Field
The invention relates to the technical field of turbine engines, in particular to a fuel supply flow control system of a turbine engine and a control method thereof.
Background
In the digital electronic control system of the aircraft engine, a fuel metering system belongs to an actuating mechanism subsystem of a control system and is mainly used for realizing the fuel flow metering function for combustion of the engine. The fuel metering system is an important component of an aircraft engine control system, and is required to supply fuel under all operating conditions of the engine and regulate the flow of fuel supplied to the engine combustion chamber according to instructions from an electronic controller. The working state of the aircraft engine generally comprises a starting process, a slow-moving state, a cruising state, a takeoff state and the like, the requirements of a combustion chamber on fuel flow are different in different states, the fuel demand in the cruising state is far less than that in the takeoff state, the working duration is longest, and the aircraft engine is a state which needs to be considered in the design of the aircraft engine.
In order to ensure the stable operation of the aircraft and the engine, the supply amount of the fuel system needs to be accurately controlled, and the rotating speed of the engine is accurately controlled. At present, the fuel flow control of an engine is mainly controlled by a servo flow valve, the servo control precision is high, but the system structure is complex, the cost is high, and the requirement on the cleanliness of oil is high; the flow control system has high requirements on use and maintenance, can be carried out by very specialized personnel, and can influence the normal work of the system because pollutants easily cause the clamping stagnation of a servo valve in the use and maintenance process.
For example, published patent CN10318886A discloses a fuel metering system based on a dual gear pump and a matching method thereof, the fuel metering system includes a dual gear pump composed of a small flow gear pump and a large flow gear pump, the dual gear pump performs oil return through an oil return valve, the oil return valve includes a first valve for adjusting oil return of the large flow gear pump, opening of the first valve in the oil return valve is automatically controlled through a differential pressure valve, input ends of the differential pressure valve are respectively connected to an inlet end and an outlet end of the metering valve, so that pressure difference of the metering valve is fed back to the oil return valve, and opening adjustment of the oil return valve is performed.
Published patent CN107701344A discloses an intelligent fuel pump with metering control function, which comprises: the intelligent control unit converts the differential pressure into real-time flow and controls the rotating speed of the servo motor according to the deviation of expected flow and real-time flow so as to enable the gear pump to pump out required fuel quantity, and the oil path selection control valve is used for gating a main oil path and an auxiliary oil path of a fuel nozzle to meet the requirement of oil supply with less flow in the starting process of an engine.
However, the above-mentioned published patent CN10318886A has the defects of complex structure, high cost, high difficulty in maintenance and debugging, etc.; the published patent CN107701344A also has the disadvantages of complex structure, high cost, complex control system, relatively low reliability, high requirement for system maintenance, etc. Therefore, a flow control system that has a simple structure, relatively low cost, high reliability, and that can achieve precise flow control with a simple control system and is less sensitive to contaminant requirements would be preferred.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in order to solve the problems in the prior art, a fuel supply flow control system of a turbine engine and a control method thereof are provided.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect of the present invention, there is provided a method for controlling a fuel supply flow rate of an engine, comprising the steps of providing a proportional valve and an orifice in a fuel delivery line, and controlling an output of the supply flow rate by adjusting a differential pressure between front and rear ends of the orifice by the proportional valve, wherein the supply flow rate is calculated by the following formula:
wherein Q is the supply flow rate through the orifice; a is the throttle area of the throttle hole; cd is a flow coefficient; rho is the fuel density; the differential pressure Δ P is therefore the differential pressure across the orifice.
Further, in the engine fuel supply flow rate control method, the pressure difference Δ P increases as the opening degree of the proportional valve increases.
Further, in the engine fuel supply flow rate control method, a square root of the differential pressure Δ P is in a proportional relationship with the supply flow rate Q.
Further, in the engine fuel supply flow rate control method, the proportional valve is controlled by an electric signal of a proportional amplifier.
The second aspect of the invention provides an engine fuel supply flow control system according to the method, which comprises a fuel tank and a fuel spray nozzle communicated with the fuel tank through a fuel delivery pipeline, and further comprises a controller, and an oil pump, a proportional valve and a throttling hole which are sequentially arranged on the fuel delivery pipeline, wherein:
and the front end and the rear end of the throttle hole are respectively provided with a first pressure sensor and a second pressure sensor, and the first pressure sensor, the second pressure sensor and the proportional valve are electrically connected with the controller.
Furthermore, in the engine fuel supply flow control system, a filter is arranged on the oil delivery pipeline at the front end or the rear end of the oil pump.
Furthermore, in the engine fuel supply flow control system, an electromagnetic valve is arranged on a fuel delivery pipeline between the proportional valve and the throttling hole.
Furthermore, on the engine fuel supply flow control system, a flow meter is arranged on an oil conveying pipeline between the throttling hole and the oil injection nozzle.
Furthermore, in the engine fuel supply flow control system, a safety valve is arranged on a fuel delivery pipeline between the oil pump and the proportional valve.
Further, in the engine fuel supply flow control system, the controller is a PID controller.
By adopting the technical scheme, compared with the prior art, the invention has the following technical effects:
the main technical scheme of the engine fuel supply flow control method is that the output of the supply flow is controlled by regulating the pressure difference of the front end and the rear end of the throttling hole through the proportional valve, and the test and verification prove that the supply flow control relation adopting the control method completely accords with the control rule and has good operability and accuracy; and the control system has simple structural design, relatively low cost and low requirement on pollutants, and has good popularization and application values.
Drawings
FIG. 1 is a schematic diagram of an engine fuel supply flow control system according to the present invention;
FIG. 2 is a graph of differential pressure versus supply flow for an engine fuel supply flow control system of the present invention at a 0.7mm orifice;
FIG. 3 is a graph of differential pressure versus supply flow for an engine fuel supply flow control system of the present invention with a 1mm orifice;
FIG. 4 is a graph of differential pressure versus supply flow for an engine fuel supply flow control system of the present invention with an orifice of 1.2 mm;
wherein the reference symbols are:
1-oil tank, 2-oil pump, 3-filter, 4-proportional valve, 5-solenoid valve, 6-orifice, 7-first pressure sensor, 8-second pressure sensor, 9-flowmeter, 10-oil nozzle, and 11-safety valve.
Detailed Description
The present invention will be described in detail and specifically with reference to the following examples to facilitate better understanding of the present invention, but the following examples do not limit the scope of the present invention.
Example 1
The embodiment provides a method for controlling the fuel supply flow of an engine, which adopts the main technical scheme that a proportional valve and an orifice are arranged on a fuel delivery pipeline, the output of the supply flow is controlled by regulating the pressure difference between the front end and the rear end of the orifice through the proportional valve, and the calculation formula of the supply flow is as follows:
wherein Q is the supply flow rate through the orifice; a is the throttle area of the throttle hole; cd is a flow coefficient; rho is the fuel density; the differential pressure Δ P is therefore the differential pressure across the orifice.
When the engine fuel supply flow control system provided by the embodiment works, an oil pump sucks oil from an oil tank and sends the oil to an inlet of a proportional valve through an oil conveying pipeline, and a safety valve is arranged between the oil pump and the proportional valve; the safety valve is set to the maximum pressure of the system, and the excessive flow exceeding the pressure overflows from the safety valve and returns to the oil tank; the proportional valve is controlled by an electric signal of the proportional amplifier and is used for adjusting the pressure difference delta P between the two ends of the throttling hole, the opening degree of the proportional valve is controlled by the signal of the proportional amplifier, and the larger the opening degree of the proportional valve is, the larger the pressure difference is generated between the two ends of the throttling hole; the larger the pressure difference is, the larger the flow rate of the fuel passing through the throttling hole is, the larger the flow rate of the fuel supplied by an engine fuel nozzle is, and the rotating speed of the engine is correspondingly increased, and vice versa.
Example 2
Referring to fig. 1, the present embodiment provides an engine fuel supply flow control system according to the method, including a fuel tank 1 and an oil nozzle 10 communicated with the fuel tank through a fuel delivery pipeline, and further including a controller, and an oil pump 2, a proportional valve 4 and an orifice 6 sequentially installed on the fuel delivery pipeline, wherein: the front end and the rear end of the throttle hole 6 are respectively provided with a first pressure sensor 7 and a second pressure sensor 8, the pressure at the front end and the rear end of the throttle hole 6 is monitored in real time through the first pressure sensor 7 and the second pressure sensor 8 to obtain a pressure difference delta P, and the first pressure sensor 7, the second pressure sensor 8 and the proportional valve 4 are electrically connected with the controller. The proportional valve 4 is controlled by the controller via an electrical signal of a proportional amplifier for the pressure difference deltap across the orifice 6, the opening of the proportional valve 4 being controlled by the signal of the proportional amplifier, the larger the opening of the proportional valve 4, the larger the pressure difference across the orifice 6.
Referring to fig. 1, in the present embodiment, a filter 3 is installed on the oil delivery pipeline at the front end or the rear end of the oil pump 2, and impurities in the fuel oil are filtered by the filter 3. Preferably, the filter 3 is installed on an oil delivery line at the rear end of the oil pump.
Referring to fig. 1, in the present embodiment, an electromagnetic valve 5 is installed on the oil pipeline between the proportional valve 4 and the orifice 6, and the electromagnetic valve 5 is electrically connected to the controller, and the on/off of the electromagnetic valve is controlled by the controller.
Referring to fig. 1, in the present embodiment, a flow meter 9 is installed on the oil pipeline between the throttle 6 and the oil nozzle 10, the flow meter 9 is electrically connected to the controller, the flow meter 9 measures the flow rate of the fuel flowing through the throttle 6 in real time, and transmits the measured data to the controller for analysis. The flow meter 9 adopts an electromagnetic flow meter or an ultrasonic flow meter.
Referring to fig. 1, in the present embodiment, a safety valve 11 is installed on the oil delivery pipeline between the oil pump 2 and the proportional valve 4, the maximum pressure that the engine fuel supply flow control system of the present embodiment can bear is set to the maximum pressure of the safety valve 11, and when the oil pump 2 supplies oil to the oil injection nozzle, the excess flow exceeding the preset pressure will overflow from the safety valve 11 back to the oil tank 2, so as to ensure the safety of the system and the accuracy of the supply flow control.
Further, the controller employed in the present embodiment is a PID controller, which is a linear controller that performs process control based on an error e (t) between the supply flow rate set value Q (t) and the actual supply flow rate output value Q '(t) as Q (t) -Q' (t). In the embodiment, the differential pressure delta P at two ends of the throttling hole is taken as a control object, the actual supply flow is measured by the flowmeter in real time, the measured value delta P is fed back to the PID controller, the controller outputs an electric signal control u (t) of the proportional amplifier to the PID controller through PID regulation operation according to an error value e (t), and the PID controller regulates the differential pressure parameter delta P at the front end and the rear end of the throttling hole influencing the supply flow according to the electric signal u (t) of the output proportional amplifier.
The supply flow rate at an orifice diameter of 0.7mm was tested based on the control method described in example 1 and the control system described in example 2 above. In the testing process, a first pressure sensor and a second pressure sensor are respectively arranged at the front end and the rear end of the throttling hole 6 and used for monitoring the pressure difference at the front end and the rear end of the throttling hole 6, and 1 flowmeter 9 is arranged at the rear end of the throttling hole 6 and used for monitoring the actual flow passing through.
1. Test conditions
The orifice diameter is 0.7mm, a is 0.38mm2,Cd＝0.75，ρ＝813.8Kg/m3；
2. verification process
By adopting the control method and the control system described in the above embodiment 1 and embodiment 2, the pressure difference and the flow rate are recorded under different pressure conditions, and the formula is used
The accuracy, precision and specificity experiments are carried out, and the test results are shown in the following table:
TABLE-supply-flow-rate test data for an orifice diameter of 07mm
3. Evaluation criteria
The relationship curve of the square root of the pressure difference and the supply flow as shown in figure 2 is drawn through the obtained monitoring data, and the flow control relationship of the system is completely in accordance with the control rule through the curve shown in figure 2, so that the system has good operability.
Based on the control method described in example 1 and the control system described in example 2, the supply flow rate was measured at an orifice diameter of 1 mm. In the testing process, a first pressure sensor and a second pressure sensor are respectively arranged at the front end and the rear end of the throttling hole 6 and used for monitoring the pressure difference at the front end and the rear end of the throttling hole 6, and 1 flowmeter 9 is arranged at the rear end of the throttling hole 6 and used for monitoring the actual flow passing through.
1. Test conditions
The diameter of the orifice is 1mm, A is 0.79mm2, Cd is 0.64, rho is 813.8Kg/m3；
2. Verification process
By adopting the control method and the control system described in the above embodiment 1 and embodiment 2, the pressure difference and the flow rate are recorded under different pressure conditions, and the formula is used
The accuracy, precision and specificity tests are carried out, and the test results are as followsShown in Table II:
data for measuring supply flow rate when diameter of orifice of meter two is 1mm
3. Evaluation criteria
The relationship curve of the square root of the pressure difference and the supply flow as shown in figure 3 is drawn through the obtained monitoring data, and the flow control relationship of the system is completely in accordance with the control rule through the curve shown in figure 3, so that the system has good operability.
The supply flow rate at an orifice diameter of 1.2mm was tested based on the control method described in example 1 and the control system described in example 2 above. In the testing process, a first pressure sensor and a second pressure sensor are respectively arranged at the front end and the rear end of the throttling hole 6 and used for monitoring the pressure difference at the front end and the rear end of the throttling hole 6, and 1 flowmeter 9 is arranged at the rear end of the throttling hole 6 and used for monitoring the actual flow passing through.
1. Test conditions
The diameter of the orifice is 1.2mm, A is 1.13mm2, Cd is 0.61, rho is 813.8Kg/m3；
2. Verification process
By adopting the control method and the control system described in the above embodiment 1 and embodiment 2, the pressure difference and the flow rate are recorded under different pressure conditions, and the formula is used
Accuracy, precision and specificity experiments are carried out, and the test results are shown in the following table three:
data for measuring supply flow rate when diameter of orifice of Meter-Tri orifice is 1.2mm
3. Evaluation criteria
The relation curve of the pressure difference and the supply flow as shown in figure 4 is drawn through the obtained monitoring data, and the flow control relation of the system is completely in accordance with the control rule through the curve as shown in figure 4, so that the system has good operability.
The embodiments of the present invention have been described in detail, but the embodiments are merely examples, and the present invention is not limited to the embodiments described above. Any equivalent modifications and substitutions to those skilled in the art are also within the scope of the present invention. Accordingly, equivalent changes and modifications made without departing from the spirit and scope of the present invention should be covered by the present invention.
Claims (10)
1. A fuel supply flow control method for an engine is characterized in that a proportional valve and an orifice are arranged on a fuel delivery pipeline, the output of the supply flow is controlled by adjusting the pressure difference of the front end and the rear end of the orifice through the proportional valve, and the calculation formula of the supply flow is as follows:
wherein Q is the supply flow rate through the orifice; a is the throttle area of the throttle hole; cd is a flow coefficient; rho is the fuel density; the differential pressure Δ P is therefore the differential pressure across the orifice.
2. The engine fuel supply flow control method according to claim 1, characterized in that the larger the opening degree of the proportional valve, the larger the differential pressure Δ P.
3. The engine fuel supply flow control method of claim 1, wherein a square root of said pressure differential Δ Ρ is directly proportional to said supply flow rate Q.
4. The engine fuel supply flow control method of claim 1, wherein the proportional valve is controlled by an electrical signal of a proportional amplifier.
5. An engine fuel supply flow control system according to the method of any one of claims 1 to 4, comprising a fuel tank (1) and a fuel injector (10) communicating therewith via a delivery line, characterized by comprising a controller and, in sequence, an oil pump (2), a proportional valve (4), and an orifice (6) arranged on said delivery line, wherein:
and a first pressure sensor (7) and a second pressure sensor (8) are respectively arranged at the front end and the rear end of the throttle hole (6), and the first pressure sensor (7), the second pressure sensor (8) and the proportional valve (4) are electrically connected with the controller.
6. The engine fuel supply flow control system according to claim 1, characterized in that a filter (3) is provided in a fuel delivery line at a front end or a rear end of the oil pump (2).
7. An engine fuel supply flow control system according to claim 1, characterized in that a solenoid valve (5) is provided in the fuel line between the proportional valve (4) and the orifice (6).
8. An engine fuel supply flow control system according to claim 1, characterized in that a flow meter (9) is provided in the fuel line between the orifice (6) and the injector (10).
9. An engine fuel supply flow control system according to claim 1, characterized in that a safety valve (11) is provided in the delivery line between the oil pump (2) and the proportional valve (4).
10. The engine fuel supply flow control system of claim 1, wherein the controller is a PID controller.
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| CN202010527591.3A CN111734534A (en) | 2020-06-11 | 2020-06-11 | Engine fuel supply flow control system and control method thereof |
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| CN202010527591.3A CN111734534A (en) | 2020-06-11 | 2020-06-11 | Engine fuel supply flow control system and control method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112747799A (en) * | 2020-12-23 | 2021-05-04 | 上海重塑能源科技有限公司 | Fuel fluid parameter calculation method and gaseous fuel supply system |
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| CN109519291A (en) * | 2018-12-31 | 2019-03-26 | 南岳电控（衡阳）工业技术股份有限公司 | A kind of high pressure co-rail system inlet metering valve flow control system and control method |
| CN110579252A (en) * | 2019-09-23 | 2019-12-17 | 中国科学院工程热物理研究所 | High-reliability fuel metering device driven by stepping motor |
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2020
- 2020-06-11 CN CN202010527591.3A patent/CN111734534A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101200108A (en) * | 2006-12-15 | 2008-06-18 | 北京中拓机械有限责任公司 | Fluid flow control system of gas foaming agent |
| CN103591990A (en) * | 2013-11-25 | 2014-02-19 | 中国航空工业集团公司沈阳发动机设计研究所 | Gas turbine fuel oil metering method based on electric pump |
| CN107078321A (en) * | 2014-08-19 | 2017-08-18 | 瓦特燃料电池公司 | A variety of reformable fuel delivery systems and method for fuel cell |
| CN109519291A (en) * | 2018-12-31 | 2019-03-26 | 南岳电控（衡阳）工业技术股份有限公司 | A kind of high pressure co-rail system inlet metering valve flow control system and control method |
| CN110579252A (en) * | 2019-09-23 | 2019-12-17 | 中国科学院工程热物理研究所 | High-reliability fuel metering device driven by stepping motor |
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| CN112747799A (en) * | 2020-12-23 | 2021-05-04 | 上海重塑能源科技有限公司 | Fuel fluid parameter calculation method and gaseous fuel supply system |
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