CN114705434B - Resistance characteristic test method for fuel distributor - Google Patents
Resistance characteristic test method for fuel distributor Download PDFInfo
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- CN114705434B CN114705434B CN202210434092.9A CN202210434092A CN114705434B CN 114705434 B CN114705434 B CN 114705434B CN 202210434092 A CN202210434092 A CN 202210434092A CN 114705434 B CN114705434 B CN 114705434B
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- 239000000446 fuel Substances 0.000 title claims description 85
- 238000010998 test method Methods 0.000 title abstract description 9
- 238000012360 testing method Methods 0.000 claims abstract description 15
- 239000000295 fuel oil Substances 0.000 claims abstract description 12
- 230000001105 regulatory effect Effects 0.000 claims abstract description 9
- 239000003921 oil Substances 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 11
- 230000008859 change Effects 0.000 claims description 4
- 238000011144 upstream manufacturing Methods 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000005192 partition Methods 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 239000002828 fuel tank Substances 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000001276 controlling effect Effects 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
- 230000000694 effects Effects 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
- 230000008569 process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
-
- 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 resistance characteristic test method of a fuel oil distributor, which maps the initial opening and completely opening outlet pressure of fuel oil supply in each area of the distributor to inlet pressure, is convenient for test control, adopts different nozzle areas, enables downstream pressure to be regulated without changing inlet pressure, keeps valve opening unchanged, develops sectional tests in different working ranges, avoids other flow path influences to respectively obtain respective complete resistance characteristics, and therefore decouples valve opening influence factors, upstream pressure, downstream pressure and other factors, and finally obtains accurate resistance characteristics of the fuel oil distributor.
Description
Technical Field
The application belongs to the technical field of aeroengines, and particularly relates to a resistance characteristic test method of a fuel oil distributor.
Background
Thermal management is one of the typical technical features of advanced powered aircraft. With the increasing heat dissipation demands of components and subsystems such as aircraft accessories, avionics systems, hydraulic systems and the like, the aircraft absorbs a great amount of heat by using fuel as a cold source, so that the temperature is greatly increased in the process of supplying the fuel from an aircraft fuel tank to an engine. The improvement of the inlet fuel temperature of the engine has adverse effects on the safe operation of the fuel accessories of the engine, the cooling of the lubricating oil and the like.
As shown in fig. 1, the fuel in the fuel tank of the aircraft enters the engine through a booster pump, a fuel filter, a fuel controller (regulator) and a fuel distributor (comprising a main distributor and a stress distributor)The engine, wherein, the fuel distributor is as one of the important parts of fuel system, and its flow resistance characteristic is crucial to thermal management analysis modeling, and the relation between flow and the upstream and downstream pressure difference is the resistance characteristic, and the expression is:
wherein G is flow, F is flow area, ρ is density, P up And P down Is the pressure upstream and downstream.
Taking the force distributor in fig. 1 as an example, the force distributor comprises a zone A oil-cutting valve 11, a zone A distributing valve 12, a zone B operating valve 13 and a zone B oil-cutting valve 14. When the engine accords with the fuel supply of the B area and the A area, fuel enters from a regulator in front of the main distributor, the B area fuel cut-off valve 14 is opened, the fuel enters into a B area fuel main pipe, and when the pressure in the B area fuel main pipe reaches P01, the A area fuel cut-off valve 12 starts to be opened, and the fuel enters into the A area fuel main pipe; when the fuel manifold pressure in zone B reaches P02, zone a is fully opened to the extent that the dispensing shutter 12 is fully opened.
Fig. 3 is a schematic diagram of the oil supply structure of the area a oil shutoff valve and the area a partition valve, when the area a partition valve 12 starts to open, the fuel pressure of the cavity Q1 is balanced with the pressure of the area a partition valve inner cavity Q2 and the elastic force of the spring 121, and the flow hole F is opened to a certain opening degree. At this time, the fuel flows into the fuel cut-off shutter chamber Q3.
The existing distributor resistance characteristic research has the following problems:
1) The valve structure in the distributor is complex, the valves are mutually restricted and are limited by factors such as manufacturing tolerance, so that accurate resistance characteristics are difficult to obtain directly through theoretical analysis or simulation;
2) According to the flow area calculation formula of the flow hole F:
F＝(P 1 -P 3 )·A valve /K
Wherein P is 1 For fuel pressure, P, of chamber Q1 3 For chamber Q3 pressure, A Valve The cross-sectional area of the valve, K is the spring rate.
The area of the flow hole F receives the hydraulic pressure P 1 And P 3 If the oil pressure P is changed according to the general resistance characteristic test method 1 Thereby varying the incoming oil pressure difference (P 1 -P 2 ) ObtainingSince the opening area of the flow hole F is affected synchronously, i.e., the valve opening degree affecting factor and the upstream and downstream pressure are changed in a coupled manner. Furthermore, the area A and the area B are mutually influenced, and according to the conventional method, the complete resistance characteristic cannot be obtained when the distributor structure is fixed, so that the obtained resistance characteristic of the distributor is inaccurate, and the theoretical calculation deviation of the fuel system heat pipe is larger.
Disclosure of Invention
It is an object of the present application to provide a method of testing the resistance characteristics of a fuel dispenser to address or mitigate at least one of the problems of the background art.
The technical scheme of the application is as follows: a method of testing the resistance characteristics of a fuel dispenser comprising:
1) Setting flow, pressure and temperature measuring devices at the inlet position and the outlet position of the fuel distributor, so as to measure flow, pressure and temperature values comprising the inlet position and the outlet position, wherein the outlet comprises an area A outlet and an area B outlet;
2) Determining the inlet pressure of the initial opening and the inlet pressure of the full opening of the area A distributing valve in the area A flow path through a test;
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 outlets of the A area and the B area are pressed according to the working state of the engine, and determining equivalent areas of nozzles at the outlets of the A area and the B area, wherein the equivalent areas of the nozzles at the outlets of the A area are multiple, and the equivalent area of the nozzles at the outlets of the B area is one;
flow path resistance characteristics for zone B oil supply structure:
4.1 Fuel oil is supplied by the fuel oil supply system, and a plurality of measuring points are uniformly selected from the minimum inlet pressure value to the initial opening inlet pressure;
4.2 B), connecting the outlet of the oil-cutting valve with a nozzle with a unique equivalent area;
4.3 The opening degree of the B area fuel cut-off valve is controlled to be completely opened by the B area control valve;
4.4 Under the condition of each inlet pressure, after the data is stable, recording the temperature, pressure and flow value of each measuring point;
4.5 Regulating the pressure of the fuel inlet, and repeating the step 4.4 to obtain the resistance characteristic of the fuel cut-off valve in the zone B;
flow path resistance characteristics for zone a oil feed structure:
5.1 Fuel is supplied by the fuel supply system, and a plurality of measuring points are uniformly selected from the initial opening inlet pressure to the full opening inlet pressure and from the full opening inlet pressure to the maximum inlet pressure;
5.2 The fuel oil main pipe in the area A is communicated with a nozzle with any equivalent area, and the fuel oil main pipe in the area B is communicated with a nozzle with only equivalent area;
5.3 A regulating instruction to enable the operating valve in the area B to control the opening degree of the oil-cutting 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;
5.5 Under the condition of each inlet pressure, after the data is stable, recording the temperature, pressure and flow value of each measuring point;
5.6 Adjusting the fuel inlet pressure, and repeating the step 5.5;
5.7 And (3) repeating the steps 5.4-5.6 on the other equivalent area nozzles at the rear side of the area A oil-cutting valve, and keeping the inlet pressure selection points under different nozzle states consistent to obtain the flow path resistance characteristic of the area A oil-cutting valve under the equivalent area nozzle.
Further, the number of the measuring points selected 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 full opening inlet pressure to the maximum opening inlet pressure.
Further, the number of the evenly selected measuring points between the minimum inlet pressure value and the initial opening inlet pressure, the number of the measuring points between the initial opening inlet pressure value and the full opening inlet pressure value, and the number of the measuring points between the full opening inlet pressure value and the maximum inlet pressure value are all not less than 5.
According to the method for testing the resistance characteristics of the fuel distributor, the initial opening and the completely opened outlet pressure of the fuel supply in each area of the distributor are mapped to the inlet pressure, so that test control is facilitated, meanwhile, different nozzle areas are adopted, the downstream pressure is regulated without changing the inlet pressure, the opening degree of a valve is kept unchanged, a sectional test is carried out in different working ranges, other flow path influences are avoided, the respective complete resistance characteristics are obtained respectively, and therefore decoupling is carried out on valve opening degree influence factors, upstream pressure, downstream pressure and other factors, and finally the accurate resistance characteristics of the fuel distributor are obtained.
Drawings
In order to more clearly illustrate the technical solutions provided by the present application, the following description will briefly refer to the accompanying drawings. It will be apparent that the figures described below are only some embodiments of the present application.
FIG. 1 is a schematic diagram of a prior art engine fuel system.
Fig. 2 is a schematic diagram of a prior art fuel distributor.
Fig. 3 is a schematic diagram of a fuel supply mechanism in a region a of the fuel distributor in fig. 2.
FIG. 4 is a schematic illustration of a fuel dispenser test of the present application.
Detailed Description
In order to make the purposes, technical solutions and advantages of the implementation of the present application more clear, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the embodiments of the present application.
In order to solve the problems that the resistance characteristic of a system cannot be obtained by adopting the common change of inlet pressure and the simulation analysis accuracy of a mechanical process of a distributor valve is insufficient due to the influence factors of the valve flow area and the coupling of upstream and downstream differential pressure in the prior art, a method for testing the resistance characteristic of a fuel distributor is provided.
The method for testing the resistance characteristics of the fuel distributor comprises the following steps of:
1) First, flow rate, pressure and temperature measuring means are provided at the inlet and outlet positions of the fuel distributor, whereby flow rate Ga, pressure Pa and temperature Ta including inlet flow rate Gi, pressure Pi and temperature Ti are measured, and flow rate Gb, pressure Pb and temperature Tb of the outlet area A (area A fuel cut valve 11) and outlet area B (area B fuel cut valve 14) are obtained.
2) The initial open inlet pressure P01 and the fully open inlet pressure P02 of the zone a partition shutter 12 in the zone a flow path were experimentally determined.
3) The method comprises the steps of determining the change range of the total inlet pressure of a distributor according to the integral working range of the fuel distributor, and determining the pressure of outlets of an area A and an area B according to the working state of an engine, wherein the pressures of the outlets of the area A fuel cut-off valve 11 and the area B fuel cut-off valve 14 are respectively equal, the outer sides of the area A fuel cut-off valve 11 and the area B fuel cut-off valve 14 are connected with a fuel main pipe, and the fuel main pipe is connected with a ring-shaped nozzle, wherein the flow equivalent areas of a plurality of nozzles at the rear side of the area A fuel cut-off valve and the flow equivalent area of the nozzles at the rear side of the area B fuel cut-off valve are equal.
In the following examples of the present application, the number of nozzles on the rear side of the section a oil cut valve is five, the equivalent areas thereof are A1, A2, A3, A4, A5, respectively, and the equivalent area of the nozzles on the rear side of the section B oil cut valve is B1.
The flow path resistance characteristics test procedure for the B-zone oil supply structure is as follows:
4.1 Fuel is supplied by a fuel supply system, a plurality of measuring points are uniformly selected from the minimum inlet pressure value to P01, for example, 5 measuring points can be selected;
4.2 The outlet of the area B fuel cut-off valve 14 is connected with a nozzle with equivalent area B1;
4.3 A regulating command to make the B area operating valve 13 operate the opening degree of the B area fuel cut valve 14 to be completely opened;
4.4 Under the condition of each inlet pressure, after the data are stable, the temperature, pressure and flow value of each measuring point are recorded.
4.5 Adjusting the fuel inlet pressure, and repeating the step 4.4 to obtain the resistance characteristic of the B region fuel cut valve 14;
the flow path resistance characteristics test procedure for the zone a oil supply structure is as follows:
5.1 Fuel is supplied by the fuel supply system, the fuel supply pressure is P01 to P02, a plurality of measuring points are uniformly selected, for example, 5 measuring points are selected, and the maximum inlet pressure value is P02 to a plurality of measuring points are uniformly selected, for example, 5 measuring points are also selected;
5.2 The fuel main pipe in the area A is communicated with a nozzle with equivalent area A1, and the fuel main pipe in the area B is communicated with a nozzle with equivalent area B1;
5.3 A regulating command for controlling the opening degree of the B-zone fuel cut valve 14 to be completely opened by the B-zone operating valve 13;
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;
5.5 Under the condition of each inlet pressure, after the data are stable, the temperature, pressure and flow value of each measuring point are recorded.
5.6 Adjusting the fuel inlet pressure, and repeating the step 5.5;
5.7 The equivalent areas A2, A3, A4 and A5 of the nozzles at the rear side of the A-area oil-cutting valve are repeated for 5.4 to 5.6, and the inlet pressure points in different nozzle states are kept consistent, so that the flow path resistance characteristic of the A-area oil-cutting valve 11 is obtained.
According to the method for testing the resistance characteristics of the fuel distributor, the initial opening and the completely opened outlet pressure of the fuel supply in each area of the distributor are mapped to the inlet pressure, so that test control is facilitated, meanwhile, different nozzle areas are adopted, the downstream pressure is regulated without changing the inlet pressure, the opening degree of a valve is kept unchanged, a sectional test is carried out in different working ranges, other flow path influences are avoided, the respective complete resistance characteristics are obtained respectively, and therefore decoupling is carried out on valve opening degree influence factors, upstream pressure, downstream pressure and other factors, and finally the accurate resistance characteristics of the fuel distributor are obtained.
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 (5)
1. A method for testing the resistance characteristics of a fuel distributor, comprising:
1) Setting flow, pressure and temperature measuring devices at the inlet position and the outlet position of the fuel distributor, so as to measure flow, pressure and temperature values comprising the inlet position and the outlet position, wherein the outlet comprises an area A outlet and an area B outlet;
2) Determining the inlet pressure of the initial opening and the inlet pressure of the full opening of the area A distributing valve in the area A flow path through a test;
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 outlets of the A area and the B area are pressed according to the working state of the engine, and determining equivalent areas of nozzles at the outlets of the A area and the B area, wherein the equivalent areas of the nozzles at the outlets of the A area are multiple, and the equivalent area of the nozzles at the outlets of the B area is one;
flow path resistance characteristics for zone B oil supply structure:
4.1 Fuel oil is supplied by the fuel oil supply system, and a plurality of measuring points are uniformly selected from the minimum inlet pressure value to the initial opening inlet pressure;
4.2 B), connecting the outlet of the oil-cutting valve with a nozzle with a unique equivalent area;
4.3 The opening degree of the B area fuel cut-off valve is controlled to be completely opened by the B area control valve;
4.4 Under the condition of each inlet pressure, after the data is stable, recording the temperature, pressure and flow value of each measuring point;
4.5 Regulating the pressure of the fuel inlet, and repeating the step 4.4 to obtain the resistance characteristic of the fuel cut-off valve in the zone B;
flow path resistance characteristics for zone a oil feed structure:
5.1 Fuel is supplied by the fuel supply system, and a plurality of measuring points are uniformly selected from the initial opening inlet pressure to the full opening inlet pressure and from the full opening inlet pressure to the maximum inlet pressure;
5.2 The fuel oil main pipe in the area A is communicated with a nozzle with any equivalent area, and the fuel oil main pipe in the area B is communicated with a nozzle with only equivalent area;
5.3 A regulating instruction to enable the operating valve in the area B to control the opening degree of the oil-cutting 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;
5.5 Under the condition of each inlet pressure, after the data is stable, recording the temperature, pressure and flow value of each measuring point;
5.6 Adjusting the fuel inlet pressure, and repeating the step 5.5;
5.7 And (3) repeating the steps 5.4-5.6 on the other equivalent area nozzles at the rear side of the area A oil-cutting valve, and keeping the inlet pressure selection points under different nozzle states consistent to obtain the flow path resistance characteristic of the area A oil-cutting valve under the equivalent area nozzle.
2. The method of claim 1, wherein the number of points selected from the initial open inlet pressure to the full open inlet pressure is the same as the number of points selected from the full open inlet pressure to the maximum open inlet pressure.
3. The method for testing the resistance characteristics of a fuel dispenser according to claim 1, wherein the number of evenly selected measuring points between the minimum inlet pressure value and the initial opening inlet pressure is not less than 5.
4. The method of claim 1, wherein the number of points selected from the initial open inlet pressure to the full open inlet pressure is not less than 5.
5. The method of claim 1, wherein the number of points selected from the fully open inlet pressure to the maximum 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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| Publication Number | Publication Date |
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| CN114705434A CN114705434A (en) | 2022-07-05 |
| CN114705434B true 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 |
|---|
| 燃油总管及喷嘴特性试验研究;邸东等;航空发动机(第02期);全文 * |
| 起动机加速控制器供油规律分析与改进研究;陈洪潮等;仪表技术(第02期);全文 * |
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