CN114705434A - Resistance characteristic test method for fuel distributor - Google Patents
Resistance characteristic test method for fuel distributor Download PDFInfo
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- CN114705434A CN114705434A CN202210434092.9A CN202210434092A CN114705434A CN 114705434 A CN114705434 A CN 114705434A CN 202210434092 A CN202210434092 A CN 202210434092A CN 114705434 A CN114705434 A CN 114705434A
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- 239000000446 fuel Substances 0.000 title claims abstract description 76
- 238000010998 test method Methods 0.000 title claims abstract description 17
- 238000012360 testing method Methods 0.000 claims abstract description 9
- 239000003921 oil Substances 0.000 claims description 31
- 239000000295 fuel oil Substances 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 abstract description 7
- 238000004458 analytical method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 230000005226 mechanical processes and functions Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/60—Efficient propulsion technologies, e.g. for aircraft
Abstract
The application provides a fuel distributor resistance characteristic test method, which maps outlet pressure of initial opening and complete opening of oil supply of each area of a distributor to inlet pressure, is convenient for test control, simultaneously adopts different nozzle areas, enables downstream pressure to be adjusted without changing the inlet pressure, keeps the opening of a valve unchanged, carries out sectional tests in different working ranges, avoids the influence of other flow paths to respectively obtain respective complete resistance characteristics, decouples the influence factors of the opening of the valve, the upstream pressure and the downstream pressure and the like, and finally obtains accurate fuel distributor resistance characteristics.
Description
Technical Field
The application belongs to the technical field of aero-engines, and particularly relates to a resistance characteristic test method for a fuel distributor.
Background
Thermal management is one of the typical technical features of advanced powered aircraft. With the increasing heat dissipation requirements of components and subsystems such as aircraft accessories, avionics systems and hydraulic systems, the aircraft absorbs a large amount of heat by using fuel oil as a cold source, so that the temperature of the fuel oil is greatly increased in the process of supplying the fuel oil to an engine from an aircraft oil tank. The improvement of the temperature of the fuel at the inlet of the engine has very bad influence on the safe work of fuel accessories of the engine, the cooling of lubricating oil and the like.
As shown in fig. 1, fuel in an aircraft fuel tank enters an engine through a booster pump, a fuel filter, a fuel controller (regulator) and a fuel distributor (including a main distributor and a boost distributor), wherein the fuel distributor is one of important components of a fuel system, the flow resistance characteristic of the fuel distributor is important for modeling of thermal management analysis, the relationship between the flow rate and the upstream and downstream pressure difference is the resistance characteristic, and the expression is as follows:
wherein G is the flow rate, F is the flow area, ρ is the density, and P isupAnd PdownThe upstream and downstream pressures.
Taking the force distributor in fig. 1 as an example, the force distributor comprises an a-area oil-break valve 11, an a-area distribution valve 12, a B-area operation valve 13 and a B-area oil-break valve 14. When the engine is in accordance with the condition that fuel supply of the B region and the A region is switched on, fuel enters from a regulator in front of a main distributor, a B region fuel cut-off valve 14 is opened, the fuel enters a B region fuel main pipe, when the pressure in the B region fuel main pipe reaches P01, a A region distribution valve 12 starts to be opened, and the fuel enters the A region fuel main pipe; when the fuel manifold pressure in zone B reaches P02, the distribution flap 12 in zone a is fully open.
Fig. 3 is a schematic diagram of the oil supply structure of the section a fuel cut-off valve and the section a distribution valve, when the section a distribution valve 12 starts to open, the fuel pressure of the chamber Q1 is balanced with the pressure of the chamber Q2 of the section a distribution valve and the elastic force of the spring 121, and the flow hole F is opened to a certain opening. At this point, fuel flows into the fuel cutoff valve cavity Q3.
The existing distributor resistance characteristic research has the following problems:
1) the valves in the distributor are complex in structure, are restricted with each other and are limited by factors such as manufacturing tolerance and the like, so that accurate resistance characteristics are difficult to obtain directly through theoretical analysis or simulation;
2) calculating formula according to the flow area of the flow hole F:
F＝(P1-P3)·Avalve door/K
In the formula, P1Fuel pressure, P, of chamber Q13Is the chamber Q3 pressure, AValve doorValve cross-sectional area, K is spring stiffness.
The area of the flow hole F is subjected to the pressure P of the incoming oil1And P3According to a general resistance characteristic test method, the pressure P of the incoming oil is varied1Thereby varying the pressure difference (P) of the incoming oil1-P2) To obtain
Because the opening area of the circulation holes F is synchronously influenced, namely the valve opening degree influencing factors and the upstream and downstream pressure and other factors are coupled and changed. Furthermore, the area A and the area B influence each other, and complete resistance characteristics cannot be obtained at a certain time of the distributor structure according to a conventional method, so that the obtained resistance characteristics of the distributor are inaccurate, and the theoretical calculation deviation of the heat pipe of the fuel system is large.
Disclosure of Invention
It is an object of the present application to provide a fuel distributor resistance characteristic test method to solve or mitigate at least one of the problems of the background art.
The technical scheme of the application is as follows: 1. a fuel distributor resistance characteristic test method comprises the following steps:
1) setting flow, pressure and temperature measuring devices at the inlet position and the outlet position of the fuel distributor, and measuring the flow, pressure and temperature values at the inlet position and the outlet position to obtain a flow, pressure and temperature value, wherein the outlet comprises an A area outlet and a B area outlet;
2) determining the initial opened inlet pressure and the fully opened inlet pressure of the distribution valve of the area A in the area A flow path through experiments;
3) determining the change range of the total inlet pressure of the distributor according to the integral working range of the fuel distributor, determining the outlet pressurized of the area A and the area B according to the working state of the engine, and determining the nozzle equivalent area of the outlets of the area A and the area B, wherein the nozzle equivalent area of the outlets of the area A is multiple, and the nozzle equivalent area of the outlets of the area B is one;
flow path resistance characteristics for the B-block oil feed structure:
4.1) supplying fuel oil by an oil supply system, wherein the oil supply pressure is a plurality of uniformly selected measuring points from the minimum inlet pressure value to the initial opening inlet pressure;
4.2) the outlet of the B-area fuel cut-off valve is communicated with a nozzle with the only equivalent area;
4.3) adjusting the instruction to enable the operation valve in the area B to control the opening degree of the oil-cut valve in the area B to be completely opened;
4.4) under each inlet pressure condition, after the data are stable, recording the temperature, pressure and flow value of each measuring point;
4.5) adjusting the pressure of a fuel inlet, and repeating the step 4.4 to obtain the resistance characteristic of the fuel-cut valve in the area B;
flow path resistance characteristics for the a-block oil feed structure:
5.1) supplying fuel oil by an oil supply system, wherein the oil supply pressure is that a plurality of measuring points are uniformly selected from the range from initial opening inlet pressure to full opening inlet pressure and the range from the full opening inlet pressure to maximum inlet pressure;
5.2) the fuel manifold in the area A is communicated with a nozzle with any equivalent area, and the fuel manifold in the area B is communicated with a nozzle with only equivalent area;
5.3) adjusting the instruction to enable the operation valve in the area B to control the opening degree of the oil-cut valve in the area B to be completely opened;
5.4) opening an oil supply system, and sequentially adjusting inlet pressure according to the oil supply pressure selected in the step 5.1;
and 5.5) recording the temperature, pressure and flow values of each measuring point under each inlet pressure condition after the data are stabilized.
5.6) adjusting the fuel inlet pressure, and repeating the step 5.5;
and 5.7) the nozzles with the other equivalent areas at the rear side of the A-area oil-break valve, repeating the step 5.4-5.6, and keeping the inlet pressure selection points in different nozzle states consistent to obtain the flow path resistance characteristic of the A-area oil-break valve under the nozzle with the equivalent area.
Furthermore, the number of the measuring points selected from the range from the initial opening inlet pressure to the full opening inlet pressure is the same as the number of the measuring points selected from the range from the full opening inlet pressure to the maximum opening inlet pressure.
Furthermore, the number of the measuring points uniformly selected from the minimum inlet pressure value to the initial opening inlet, the number of the measuring points selected from the initial opening inlet pressure to the full opening inlet pressure and the number of the measuring points selected from the full opening inlet pressure to the maximum opening inlet pressure are not less than 5.
The fuel distributor resistance characteristic test method maps the outlet pressure of initial opening and complete opening of oil supply of each area of the distributor to the inlet pressure, is convenient for test control, simultaneously adopts different nozzle areas, enables downstream pressure to be adjusted without changing the inlet pressure, keeps the opening of the valve unchanged, develops sectional tests in different working ranges, avoids other flow path influences to respectively obtain respective complete resistance characteristics, accordingly decouples factors such as the valve opening influence factor and the upstream and downstream pressures, and finally obtains accurate fuel distributor resistance characteristics.
Drawings
In order to more clearly illustrate the technical solutions provided by the present application, the following briefly introduces the accompanying drawings. It is to be expressly understood that the drawings described below are only illustrative of some embodiments of the invention.
FIG. 1 is a schematic diagram of a prior art engine fuel system.
Fig. 2 is a schematic view of a prior art fuel distributor.
Fig. 3 is a schematic view of a fuel supply mechanism in the fuel distributor of fig. 2.
Fig. 4 is a schematic diagram of a fuel distributor test of the present application.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application.
The fuel distributor resistance characteristic test method is provided for solving the problems that the resistance characteristic of a system cannot be obtained by generally changing inlet pressure and the simulation analysis accuracy of a mechanical process adopted by a distributor valve is not enough due to the influence factor of the valve flow area and the coupling of upstream and downstream differential pressure in the prior art.
The method for testing the resistance characteristic of the fuel distributor comprises the following processes or steps:
1) first, flow, pressure and temperature measuring devices are arranged at the inlet position and the outlet position of the fuel distributor, and therefore the flow, the pressure and the temperature including the inlet flow Gi, the pressure Pi and the temperature Ti, the flow Ga, the pressure Pa and the temperature Ta of the outlet area A (the area A fuel cut-off valve 11) and the flow Gb, the pressure Pb and the temperature Tb of the outlet area B (the area B fuel cut-off valve 14) are measured.
2) The initial open inlet pressure P01 and the fully open inlet pressure P02 of the zone a distributing valve 12 in the zone a flow path were determined by experiments.
3) Determining the change range of the total inlet pressure of the distributor according to the integral working range of the fuel distributor, determining that the outlets of the area A and the area B are pressed according to the working state of an engine, wherein the pressed outlets are the pressure at the outlets of the area A fuel-cut valve 11 and the area B fuel-cut valve 14, the outer sides of the area A fuel-cut valve 11 and the area B fuel-cut valve 14 are connected with a fuel manifold, and the fuel manifold is connected with a ring-shaped nozzle, wherein the flow equivalent area of a plurality of nozzles at the rear side of the area A fuel-cut valve and the flow equivalent area of nozzles at the rear side of the area B fuel-cut valve are equal.
In the following examples of the present application, the number of nozzles on the rear side of the a-block gate is five, and the equivalent areas thereof are a1, a2, A3, a4, a5, respectively, and the nozzle equivalent area on the rear side of the B-block gate is B1.
The flow path resistance characteristic test procedure for the B-block oil supply structure is as follows:
4.1) supplying fuel by an oil supply system, wherein the oil supply pressure is between the minimum inlet pressure value and P01, and a plurality of measuring points are uniformly selected, for example, 5 measuring points can be selected;
4.2) the outlet of the B-section oil-break valve 14 is communicated with a nozzle with equivalent area B1;
4.3) adjusting an instruction to ensure that the operating valve 13 in the area B controls the opening degree of the fuel cut-off valve 14 in the area B to be completely opened;
and 4.4) recording the temperature, pressure and flow values of each measuring point under each inlet pressure condition after the data are stabilized.
4.5) adjusting the pressure of a fuel inlet, and repeating the step 4.4 to obtain the resistance characteristic of the fuel-cut valve 14 in the area B;
the flow path resistance characteristic test procedure for the block a oil supply structure is as follows:
5.1) supplying fuel oil by an oil supply system, uniformly selecting a plurality of measuring points from the oil supply pressure P01 to P02, for example, selecting 5 measuring points, and uniformly selecting a plurality of measuring points from P02 to the maximum inlet pressure value, for example, also selecting 5 measuring points;
5.2) the fuel main pipe in the area A is communicated with a nozzle with the equivalent area of A1, and the fuel main pipe in the area B is communicated with a nozzle with the equivalent area of B1;
5.3) adjusting instructions to enable the B area operating valve 13 to control the opening degree of the B area fuel cut-off valve 14 to be completely opened;
5.4) opening an oil supply system, and sequentially adjusting inlet pressure Pi according to the oil supply pressure selected in the step 4.1;
and 5.5) recording the temperature, pressure and flow values of each measuring point under each inlet pressure condition after the data are stabilized.
5.6) adjusting the fuel inlet pressure, and repeating the step 5.5;
5.7) nozzles with equivalent areas A2, A3, A4 and A5 at the rear side of the A-area fuel cut-off valve, repeating the steps 5.4-5.6, and keeping inlet pressure selection points of different nozzle states consistent to obtain the flow path resistance characteristic of the A-area fuel cut-off valve 11.
The fuel distributor resistance characteristic test method maps the outlet pressure of initial opening and complete opening of oil supply of each area of the distributor to the inlet pressure, is convenient for test control, simultaneously adopts different nozzle areas, enables downstream pressure to be adjusted without changing the inlet pressure, keeps the opening of the valve unchanged, develops sectional tests in different working ranges, avoids other flow path influences to respectively obtain respective complete resistance characteristics, accordingly decouples factors such as the valve opening influence factor and the upstream and downstream pressures, and finally obtains accurate fuel distributor resistance characteristics.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within 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 (5)
1. A fuel distributor resistance characteristic test method is characterized by comprising the following steps:
1) setting flow, pressure and temperature measuring devices at the inlet position and the outlet position of the fuel distributor, and measuring the flow, pressure and temperature values at the inlet position and the outlet position to obtain a flow, pressure and temperature value, wherein the outlet comprises an A area outlet and a B area outlet;
2) determining the initial opened inlet pressure and the fully opened inlet pressure of the distribution valve of the area A in the area A flow path through experiments;
3) determining the change range of the total inlet pressure of the distributor according to the integral working range of the fuel distributor, determining the outlet pressurized of the area A and the area B according to the working state of the engine, and determining the nozzle equivalent area of the outlets of the area A and the area B, wherein the nozzle equivalent area of the outlets of the area A is multiple, and the nozzle equivalent area of the outlets of the area B is one;
flow path resistance characteristics for the B-zone oil supply structure:
4.1) supplying fuel oil by an oil supply system, wherein the oil supply pressure is a plurality of uniformly selected measuring points from the minimum inlet pressure value to the initial opening inlet pressure;
4.2) the outlet of the B-area fuel cut-off valve is communicated with a nozzle with the only equivalent area;
4.3) adjusting the instruction to enable the operation valve in the area B to control the opening degree of the oil-cut valve in the area B to be completely opened;
4.4) under each inlet pressure condition, recording the temperature, pressure and flow value of each measuring point after the data is stable;
4.5) adjusting the pressure of a fuel inlet, and repeating the step 4.4 to obtain the resistance characteristic of the fuel-cut valve in the area B;
flow path resistance characteristics for the a-block oil feed structure:
5.1) supplying fuel oil by an oil supply system, wherein the oil supply pressure is that a plurality of measuring points are uniformly selected from the range from initial opening inlet pressure to full opening inlet pressure and the range from the full opening inlet pressure to maximum inlet pressure;
5.2) the fuel manifold in the area A is communicated with a nozzle with any equivalent area, and the fuel manifold in the area B is communicated with a nozzle with only equivalent area;
5.3) adjusting the instruction to enable the operation valve in the area B to control the opening degree of the oil-cut valve in the area B to be completely opened;
5.4) opening an oil supply system, and sequentially adjusting inlet pressure according to the oil supply pressure selected in the step 5.1;
and 5.5) recording the temperature, pressure and flow values of each measuring point under each inlet pressure condition after the data are stabilized.
5.6) adjusting the fuel inlet pressure, and repeating the step 5.5;
and 5.7) the nozzles with the other equivalent areas at the rear side of the A-area oil-break valve, repeating the step 5.4-5.6, and keeping the inlet pressure selection points in different nozzle states consistent to obtain the flow path resistance characteristic of the A-area oil-break valve under the nozzle with the equivalent area.
2. The fuel distributor resistance characteristic test method of claim 1, wherein the number of the points selected between the initial open inlet pressure and the full open inlet pressure is the same as the number of the points selected between the full open inlet pressure and the maximum open inlet pressure.
3. The fuel distributor resistance characteristic test method of claim 1, wherein the number of uniformly selected measuring points from the minimum inlet pressure value to the initial opening inlet is not less than 5.
4. The fuel distributor resistance characteristic test method of claim 1, wherein the number of the selected test points from the initial open inlet pressure to the full open inlet pressure is not less than 5.
5. The fuel distributor resistance characteristic test method of claim 1, wherein the number of the selected measuring points from the full open inlet pressure to the maximum open inlet pressure is not less than 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210434092.9A CN114705434B (en) | 2022-04-24 | 2022-04-24 | Resistance characteristic test method for fuel distributor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210434092.9A CN114705434B (en) | 2022-04-24 | 2022-04-24 | Resistance characteristic test method for fuel distributor |
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| CN114705434A true CN114705434A (en) | 2022-07-05 |
| CN114705434B CN114705434B (en) | 2024-01-02 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7624720B1 (en) * | 2008-08-01 | 2009-12-01 | Ford Global Technologies, Llc | Variable set point fuel pressure regulator |
| CN104405506A (en) * | 2014-11-28 | 2015-03-11 | 哈尔滨广瀚燃气轮机有限公司 | Novel fuel regulator for ships |
| CN111927637A (en) * | 2020-08-11 | 2020-11-13 | 中国航发北京航科发动机控制系统科技有限公司 | Emergency fuel supply mechanism and emergency fuel supply method |
| CN114323621A (en) * | 2022-01-05 | 2022-04-12 | 中国航发贵阳发动机设计研究所 | Fuel manifold characteristic test system with fuel distributor and test method |
-
2022
- 2022-04-24 CN CN202210434092.9A patent/CN114705434B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7624720B1 (en) * | 2008-08-01 | 2009-12-01 | Ford Global Technologies, Llc | Variable set point fuel pressure regulator |
| CN104405506A (en) * | 2014-11-28 | 2015-03-11 | 哈尔滨广瀚燃气轮机有限公司 | Novel fuel regulator for ships |
| CN111927637A (en) * | 2020-08-11 | 2020-11-13 | 中国航发北京航科发动机控制系统科技有限公司 | Emergency fuel supply mechanism and emergency fuel supply method |
| CN114323621A (en) * | 2022-01-05 | 2022-04-12 | 中国航发贵阳发动机设计研究所 | Fuel manifold characteristic test system with fuel distributor and test method |
Non-Patent Citations (2)
| Title |
|---|
| 邸东等: "燃油总管及喷嘴特性试验研究", 航空发动机, no. 02 * |
| 陈洪潮等: "起动机加速控制器供油规律分析与改进研究", 仪表技术, no. 02 * |
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