CN116025471A - Dual gear pump oil supply system architecture and dual mode conversion method - Google Patents
Dual gear pump oil supply system architecture and dual mode conversion method Download PDFInfo
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- CN116025471A CN116025471A CN202310098492.1A CN202310098492A CN116025471A CN 116025471 A CN116025471 A CN 116025471A CN 202310098492 A CN202310098492 A CN 202310098492A CN 116025471 A CN116025471 A CN 116025471A
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- Y02T10/10—Internal combustion engine [ICE] based vehicles
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Abstract
The application provides a dual gear pump oil supply system architecture and a dual mode conversion method, which belong to the technical field of aeroengine fuel and control systems, and specifically comprise an oil tank, a low-pressure centrifugal pump, a dual gear pump, a one-way valve, an oil return valve, a metering device, a sensor, a pipeline and the like, wherein the dual gear pump oil supply system architecture has a dual oil return function, and a first oil return pipeline is arranged between the metering device and the oil tank to be conducted so that excess fuel returns to the oil tank after metering; the second oil return pipeline is arranged between the inlet and the outlet of the second gear pump, and an electric control oil return valve is arranged in the middle of the pipeline. The system has two oil supply working modes: the first is that the first gear pump with small flow independently supplies oil, and the second gear pump with large flow works in idle load; the second is the first gear pump and the second parallel oil supply, and the second oil return pipeline is closed. The two oil supply working modes are converted by adopting the control method based on the characteristic model of the small gear pump, so that the flight service time of the engine is more than 95% and is in the first oil supply working mode.
Description
Technical Field
The application relates to the field of aero-engine fuel and control systems, in particular to a dual gear pump fuel supply system architecture and a dual mode conversion method.
Background
In an aeroengine, a fuel oil supply system belongs to a key energy supply subsystem, and is mainly used for realizing the fuel oil supply function required by engine combustion and simultaneously ensuring the temperature rise and the power consumption of the fuel oil system.
Because the aero-engine has great difference of fuel flow requirements under different flight conditions, the adjustable range of the fuel flow is wider, and the working point of the fuel pump always deviates far from the optimal performance point by adopting a wide-range large-flow single-pump fuel supply, the temperature rise and the power consumption of the fuel system are increased, waste is generated, the heat exchange and the heat sink management of the fuel/lubricating oil system are not facilitated, and potential safety hazards are brought to the engine.
From the analysis of a typical flight profile of an aeroengine, the high-flow fuel supply working time is obviously lower and approximately accounts for 1% -5% of the total flight mission time, and when a fuel system is designed, in order to ensure the fuel flow requirement of the maximum state, the rated state of a fuel pump is often required to be designed at a high state point, the long-time working state of the engine is a cruising state, and the fuel flow requirement of the state accounts for about 38% of the maximum flow requirement, so that the fuel pump works in an unrated state for a long time, the efficiency is lower, the temperature rise is increased, the oil return amount is larger, and larger power consumption and energy loss are caused. If the state adopts a small-flow single pump to work at the optimal performance point, the oil return is reduced by about 50-70%, the temperature rise of the fuel system can be reduced, and the power consumption of the pump is reduced. Therefore, it is necessary to optimally design the fuel system architecture so that the fuel pump always operates at approximately the optimal performance point while meeting the main fuel supply requirements.
The main combustion system generally adopts a gear pump, belongs to a quantitative pump, and when the required flow of a combustion chamber is far smaller than the oil supply flow of the pump, a large amount of redundant fuel oil needs to be returned to an inlet of the fuel system with lower pressure, so that the temperature of the inlet fuel oil is increased due to heat generation, the pressure boost of the fuel pump also generates temperature rise, the temperature rise is further aggravated, the overall balance temperature of the fuel system is higher, the abrasion of the gear pump is aggravated due to long-time circulation, and the gear pump is damaged under severe conditions. In addition, too high a temperature of the fuel will reduce the thermal stability of the fuel, and a heat sink is easily formed in the fuel, which may cause the filter of the engine to be blocked, causing the failure of the engine fuel supply system, and affecting the safety and reliability of the aircraft.
Disclosure of Invention
In view of the above, the application provides a dual gear pump oil supply system architecture and a dual mode conversion method, which solve the problems of large energy loss and high fuel temperature rise under most working conditions of a fuel oil supply system in the prior art, effectively improve the heat exchange capacity of the fuel oil system, and improve the safety and reliability of airplane flight.
On one hand, the oil supply system architecture of the duplex gear pump provided by the application adopts the following technical scheme:
a dual gear pump oil supply system architecture, comprising:
an oil tank for storing an oil source;
the double gear pump comprises a first gear pump and a second gear pump, the flow rate of the first gear pump is smaller than that of the second gear pump, the first gear pump and the second gear pump are both connected with an output pipe of an oil tank, and the first gear pump and the second gear pump are mutually connected in parallel;
the metering device is characterized in that an outlet of the first gear pump is connected with the metering device through a first pipeline, an outlet of the second gear pump is connected with the metering device through a second pipeline, a one-way valve is arranged on the second pipeline, the metering device calculates fuel supply quantity of the combustion chamber according to a throttle lever, a high-pressure rotating speed of the engine and an inlet temperature of the engine after converging fuel of the first gear pump and the second gear pump, the hydraulic valve is driven to open through an actuating mechanism to supply fuel to the main combustion chamber, and the one-way valve is conducted when the outlet pressure of the second gear pump is not less than the pressure of the first gear pump, otherwise, the one-way valve is not conducted.
Optionally, the output tube of oil tank passes through low pressure centrifugal pump and connects first gear pump and second gear pump, the import of first gear pump and second gear pump is connected to the output tube of low pressure centrifugal pump.
Optionally, the outlet of the second gear pump is provided with two paths of outputs, one path of output is communicated with the metering device, the other path of output is provided with an oil return valve, and the outlet of the oil return valve is communicated with the inlet of the duplex gear pump.
Optionally, a first oil return pipeline communicated with an oil tank output pipe is arranged on the metering device.
Optionally, temperature sensors are arranged on the output pipe of the oil tank and the output pipe of the metering device.
Optionally, a pressure sensor is arranged on a pipeline between the outlet of the first gear pump and the inlet of the metering device, and the outlet pressure of the first gear pump is measured.
On the other hand, the dual-mode conversion method of the oil supply system architecture of the duplex gear pump provided by the application adopts the following technical scheme:
the dual-mode conversion method of the dual-gear pump oil supply system architecture comprises the dual-gear pump oil supply system architecture, and the dual-mode conversion method of the dual-gear pump oil supply system architecture comprises the following steps:
step 1, a first gear pump model is established, wherein wfre=f (N2, pf 1), wherein N2 is the engine speed percentage, and Pf1 is the first gear pump post pressure;
and 5, calculating the temperature rise of the fuel system, setting a temperature rise threshold, and outputting an electric signal for opening the oil return valve when the following formula is satisfied, wherein the calculation formula is as follows: delta T f ＝(T f -T fin )≥T f0 ；
Wherein: t (T) f For measuring the outlet fuel temperature, T fin For fuel system inlet temperature, T f0 Is a temperature rise threshold;
and (3) outputting an oil return valve opening control instruction according to the conclusion obtained in the step (4) and the step (5) if one of the steps is satisfied, so that the dual gear pump oil supply system works in a single pump working mode, and otherwise works in a dual pump working mode.
Optionally, in the step 2, the theoretical oil supply flow WfRe (t) under the current rotation speed and the pressure of the first gear pump is calculated in real time by adopting an interpolation method.
Optionally, in the step 3, a relative variation of a difference between WfDem (t) at the current time t and WfRe (t) calculated by the first gear pump model is less than or equal to a set threshold W 0 Subtracting 0.03, to a dual pump mode of operation.
In summary, the present application includes the following beneficial technical effects:
the dual gear pump oil supply system architecture and the dual conversion method can adjust the working mode of the dual gear pump according to the fuel flow requirement of the engine, and compared with mechanical hydraulic adjustment, the dual gear pump oil supply system architecture and the dual conversion method have the advantages that the operability is obviously improved, and the self-adaption capability is enhanced.
Experiments prove that under the single pump working mode (independent oil supply of the first gear pump), the power consumption of the duplex gear pump is up to 14kW, the temperature of the fuel system rises by 16 ℃ (no fuel/lubricating oil radiator), and the power consumption of independent oil supply of the large-flow gear pump in a relatively wide range is 35kW and the temperature of the fuel system rises by 52 ℃ are obviously reduced; the advantages of power consumption and temperature rise of the duplex gear pump are not obvious in the double pump working mode (oil supply by the duplex gear pump in parallel). The utilization rate of the single pump working mode of the whole life cycle of the engine is as high as 95%, power consumption and temperature rise in most working time are reduced, and the method has great advantages under the condition that the weight of the system is not increased (the weight of the integrated duplex gear pump is not increased).
The dual gear pump oil supply system architecture has higher reliability. Under the condition of one pump failure, the other pump can still ensure the operation of the engine under the low working condition, thereby improving the reliability of the fuel system and ensuring the flight safety.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of a dual gear pump oil supply system architecture;
fig. 2 is a control logic block diagram of a dual mode switching method for a dual gear pump oil supply system architecture.
Reference numerals illustrate: 1. an oil tank; 2. a low pressure centrifugal pump; 3. a duplex gear pump; 31. a first gear pump; 32. a second gear pump; 4. a metering device; 6. an oil return valve; 7. a one-way valve; 8. a second oil return pipe; 9. a first oil return pipe; 10. a second pipeline; 11. a first pipeline; 12. a temperature sensor; 14. a pressure sensor.
Detailed Description
Embodiments of the present application are described in detail below with reference to the accompanying drawings.
Other advantages and effects of the present application will become apparent to those skilled in the art from the present disclosure, when the following description of the embodiments is taken in conjunction with the accompanying drawings. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. The present application may be embodied or carried out in other specific embodiments, and the details of the present application may be modified or changed from various points of view and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
It is noted that various aspects of the embodiments are described below within the scope of the following claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the present application, one skilled in the art will appreciate that one aspect described herein may be implemented independently of any other aspect, and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number of the aspects set forth herein. In addition, such apparatus may be implemented and/or such methods practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.
It should also be noted that the illustrations provided in the following embodiments merely illustrate the basic concepts of the application by way of illustration, and only the components related to the application are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.
In addition, in the following description, specific details are provided in order to provide a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects may be practiced without these specific details.
The embodiment of the application provides a duplex gear pump oil supply system architecture.
The embodiment of the application provides a duplex gear pump oil supply system architecture.
As shown in fig. 1, a dual gear pump oil supply system architecture includes:
and the oil tank 1 stores an oil source.
The low-pressure centrifugal pump 2 is used for slightly pressurizing fuel oil (pressurizing 0.5-1.5 MPa), an inlet is connected with the oil tank 1, and an outlet is connected with the duplex gear pump 3;
the duplex gear pump 3 comprises a first gear pump 31 and a second gear pump 32, wherein the rated oil supply flow of the first gear pump 31 is far smaller than that of the second gear pump 32, the rated flow ratio is about 1:3, the inlets of the first gear pump 31 and the second gear pump 32 are connected with the output pipe of the low-pressure centrifugal pump 2, the first gear pump 31 and the second gear pump 32 are mutually connected in parallel, and share a transmission shaft to form an integrated combined pump, and the weight of the combined pump is equal to that of the independent high-flow oil supply gear pump;
and the metering device 4 receives the oil supply of the duplex gear pump 3 and adjusts the fuel flow to the main combustion chamber according to the control instruction. In the duplex gear pump 3, the outlet of the first gear pump 31 is connected with a metering device through a pipeline 11, the outlet of the second gear pump 32 is connected with the metering device 4 through a pipeline 10, and a one-way valve 7 is arranged on the pipeline 10. The control instruction is a control system output instruction. The metering device 4 discharges the excess fuel after metering to the return chamber and returns to the tank inlet line via the first return line 9.
The system is not limited to accessories such as fuel filters, radiators, throttle valves, differential pressure valves, collecting valves and the like which are added for realizing other auxiliary functions.
The outlet of the second gear pump 32 is connected with two pipelines, one pipeline is communicated with the metering device 4, the middle is provided with a one-way valve 7, the other pipeline is connected with the inlet of the second gear pump, and the pipeline 8 is provided with an oil return valve 6. The oil return valve 6 can receive a control command to perform the on/off function of the second oil return pipe 8. The oil return valve 6 adopts a normally open electromagnetic unloading valve, and is in a normally open state when no control electric signal is received, namely the fuel system works in a first oil supply working mode. The control system calculates and compares the parameters of the fuel pressure Pf1, the temperature Tf, the fuel supply flow WfDem, the engine speed N2 and the like to output an on or off control command which acts on the normally open electromagnetic unloading valve. The first oil supply operation mode is when the oil return valve 6 is conductive, and the second oil supply operation mode is when the oil return valve 6 is non-conductive.
The fuel metering device 4 calculates the fuel supply amount WfDem of the combustion chamber according to the throttle lever PLA, the high-pressure rotating speed N2 of the engine and the inlet temperature T2 of the engine, and drives the opening of the hydraulic valve through the actuating mechanism to supply fuel to the main combustion chamber according to the WfDem, and if the combined fuel supply amount is larger than the WfDem, the redundant fuel is discharged into the oil return cavity.
A pressure sensor 14 is provided in the line between the outlet of the first gear pump 31 and the inlet of the metering device 4 to measure the outlet pressure of the first gear pump 31.
The dual-mode conversion algorithm integrated in the control system calculates and outputs a control instruction of whether the oil return valve 6 is needed or not according to the fuel temperature rise delta Tf, the post-pump pressure Pf1, the oil supply flow WfRe and the engine rotating speed N2, if the control instruction is on, the normally open electromagnetic unloading valve is powered off, the second oil return pipeline 8 is conducted, the inlet and outlet pipelines of the second gear pump 32 are communicated and hardly pressurized, the power consumption is minimum, and the temperature rise of the second gear pump 32 is very small due to the proportional relation between the pressurized and the temperature rise, so that the system enters the first oil supply working mode; simultaneously, the check valve 7 is closed due to the pressure reduction after the second gear pump 32, so that the fuel oil flowing back through the metering device 4 is prevented; if the control command is off, the normally open electromagnetic unloading valve is electrified, the second oil return pipeline 8 is not conducted, the second gear pump 32 starts to boost pressure, the check valve 7 is opened when the pressure of the second gear pump 32 exceeds a threshold value, at the moment, the second gear pump 32 and the first gear pump 31 supply oil to the main combustion chamber through the metering device 4 at the same time, and the system enters a second oil supply working mode.
The embodiment of the application also discloses a dual-mode conversion method of the oil supply system architecture of the duplex gear pump.
As shown in fig. 2, a dual mode conversion method of a dual gear pump oil supply system architecture, where the dual gear pump oil supply system architecture is the dual gear pump oil supply system architecture, the dual mode conversion method of the dual gear pump oil supply system architecture includes:
step 1, a first gear pump model is established, wfre=f (N2, pf 1), wherein N2 is the engine speed percentage and Pf1 is the first gear pump post pressure.
And 2, calculating the theoretical oil supply flow WfRe (t) of the first gear pump at the current rotating speed and the pressure in real time.
and step 4, outputting an oil return valve control instruction according to the judgment result in the step 3.
And 5, calculating the temperature rise (1007 in fig. 2) of the fuel system, setting a temperature rise threshold, and outputting an oil return valve opening electric signal when the following formula is satisfied, wherein the calculation formula is as follows: delta T f ＝(T f -T fin )≥T f0 。
Wherein: t (T) f For measuring the outlet fuel temperature, T fin For fuel system inlet temperature, T f0 Is a temperature rise threshold.
And (3) outputting an oil return valve opening control instruction according to the conclusion obtained in the step (4) and the step (5) if one of the steps is satisfied, so that the dual gear pump oil supply system works in a single pump working mode, and otherwise works in a dual pump working mode.
((Tf-Tfin)≥Tf 0 or(WfRe-WfDem)/WfRe≥W 0 )＝true
Step 1 a calculation model of the WfRe parameter is formulated by the small flow gear pump pressure-speed-flow characteristics (1003 in fig. 2). The model is obtained according to the performance test data of the small-flow gear pump, and the model data after normalization treatment is shown in table 1.
TABLE 1 calculation model for WfRe of first gear pump
In the step 2, the theoretical oil supply flow WfRe (t) under the current rotating speed and pressure of the first gear pump is calculated in real time by adopting a nearest neighbor interpolation method.
Nearest neighbor interpolation calculation formula:
wherein: t represents the current moment, N represents the number of samples of the array [ N2 (i), pf1 (i), wfRe (i) ] in the model, i represents the number of the array of the ith sample, and p represents the relative importance of the remote samples of the estimated point, and 4 is generally taken. WfRe (t) represents the theoretical oil supply flow to the first gear pump at time t, N2 (t) represents the percentage of the measured engine speed at time t, and Pf1 (t) represents the measured outlet pressure of the first gear pump at time t.
In step 3, the relative variation of the difference between WfDem (t) at the current time t and WfRe (t) calculated by the first gear pump model is less than or equal to a set threshold W 0 Subtracting 0.03, the operation mode is converted into a double pump operation mode, and the following formula is adopted:
in engineering practice, the threshold value W in step 3 0 The threshold may be adjusted based on experimental verification results or fuel pump performance degradation for adjustable parameters.
The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions easily conceivable by those skilled in the art within the technical scope of the present application should be covered in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (9)
1. A dual gear pump oil supply system architecture, comprising:
an oil tank for storing an oil source;
the double gear pump comprises a first gear pump and a second gear pump, the flow rate of the first gear pump is smaller than that of the second gear pump, the first gear pump and the second gear pump are both connected with an output pipe of an oil tank, and the first gear pump and the second gear pump are mutually connected in parallel;
the metering device is characterized in that an outlet of the first gear pump is connected with the metering device through a first pipeline, an outlet of the second gear pump is connected with the metering device through a second pipeline, a one-way valve is arranged on the second pipeline, the metering device calculates fuel supply quantity of the combustion chamber according to a throttle lever, a high-pressure rotating speed of the engine and an inlet temperature of the engine after converging fuel of the first gear pump and the second gear pump, the hydraulic valve is driven to open through an actuating mechanism to supply fuel to the main combustion chamber, and the one-way valve is conducted when the outlet pressure of the second gear pump is not less than the pressure of the first gear pump, otherwise, the one-way valve is not conducted.
2. The dual gear pump oil supply system architecture of claim 1, wherein the output pipe of the oil tank is connected to the first gear pump and the second gear pump through a low pressure centrifugal pump, and the output pipe of the low pressure centrifugal pump is connected to inlets of the first gear pump and the second gear pump.
3. The oil supply system architecture of the duplex gear pump according to claim 1, wherein the outlet of the second gear pump is provided with two paths of outputs, one path of output is communicated with the metering device, the other path of output is provided with an oil return valve, and the outlet of the oil return valve is communicated with the inlet of the duplex gear pump.
4. The oil supply system architecture of the duplex gear pump according to claim 1, wherein a first oil return pipeline communicated with an oil tank output pipe is arranged on the metering device.
5. The dual gear pump oil supply system architecture of claim 1, wherein temperature sensors are provided on the output pipe of the oil tank and the output pipe of the metering device.
6. The dual gear pump oil supply system architecture of claim 1, wherein a pressure sensor is disposed on a line between an outlet of the first gear pump and an inlet of the metering device to measure the first gear pump outlet pressure.
7. A dual mode conversion method of a dual gear pump oil supply system architecture, wherein the dual gear pump oil supply system architecture comprises the dual gear pump oil supply system architecture of any one of claims 1 to 6, the dual mode conversion method of the dual gear pump oil supply system architecture comprising:
step 1, a first gear pump model is established, wherein wfre=f (N2, pf 1), wherein N2 is the engine speed percentage, and Pf1 is the first gear pump post pressure;
step 2, calculating theoretical oil supply flow WfRe (t) of the first gear pump at the current rotating speed and pressure in real time;
step 3, calculating the relative variation of the difference value of the WfDem (t) at the current moment t and the WfRe (t) calculated by the first gear pump model according to the control system in real time, and setting a threshold value W 0 When greater than W 0 Outputting an instruction for conducting an oil return valve;
step 4, outputting an oil return valve control instruction according to the judgment result of the step 3;
and 5, calculating the temperature rise of the fuel system, setting a temperature rise threshold, and outputting an electric signal for opening the oil return valve when the following formula is satisfied, wherein the calculation formula is as follows: delta T f ＝(T f -T fin )≥T f0 ；
Wherein: t (T) f For measuring the outlet fuel temperature, T fin For fuel system inlet temperature, T f0 Is a temperature rise threshold;
and (3) outputting an oil return valve opening control instruction according to the conclusion obtained in the step (4) and the step (5) if one of the steps is satisfied, so that the dual gear pump oil supply system works in a single pump working mode, and otherwise works in a dual pump working mode.
8. The dual-mode switching method of the dual-gear pump oil supply system architecture according to claim 7, wherein in the step 2, the theoretical oil supply flow WfRe (t) under the current rotation speed and the pressure of the first gear pump is calculated in real time by adopting an interpolation method.
9. The dual-mode switching method of dual-gear pump oil supply system architecture according to claim 7, wherein in the step 3, a relative variation of a difference between WfDem (t) at a current time t and WfRe (t) calculated by the first gear pump model is less than or equal to a set threshold W 0 Subtracting 0.03, to a dual pump mode of operation.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116291895A (en) * | 2023-05-19 | 2023-06-23 | 成都凯天电子股份有限公司 | Missile fuel system capable of meeting high altitude use and design method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116291895A (en) * | 2023-05-19 | 2023-06-23 | 成都凯天电子股份有限公司 | Missile fuel system capable of meeting high altitude use and design method thereof |
| CN116291895B (en) * | 2023-05-19 | 2023-10-24 | 成都凯天电子股份有限公司 | Missile fuel system capable of meeting high altitude use and design method thereof |
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