CN114878171A - Engine starting oil supply rule design method based on core machine - Google Patents

Engine starting oil supply rule design method based on core machine Download PDF

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CN114878171A
CN114878171A CN202210395218.6A CN202210395218A CN114878171A CN 114878171 A CN114878171 A CN 114878171A CN 202210395218 A CN202210395218 A CN 202210395218A CN 114878171 A CN114878171 A CN 114878171A
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engine
oil supply
starting
speed
fac
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王赫
李焦宇
吉思环
王军
赵明阳
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AECC Shenyang Engine Research Institute
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AECC Shenyang Engine Research Institute
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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
    • G01M15/04—Testing internal-combustion engines
    • 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
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    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation

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Abstract

The application belongs to the field of engine oil supply design, and discloses a core machine-based engine starting oil supply rule design method. R The relation between the engine starting oil supply rule and the core engine starting oil supply rule is found by the engine test run, and the relation between the engine starting oil supply rule and the core engine starting oil supply rule is found; the test risk is reduced, the test efficiency is improved, and the test cost is reduced.

Description

Engine starting oil supply rule design method based on core machine
Technical Field
The application belongs to the field of engine oil supply design, and particularly relates to a method for designing an engine starting oil supply rule based on a core engine.
Background
The core engine is the most important component of the engine, including the components and systems for maximum temperature, maximum pressure, and maximum rotational speed in the engine system. Therefore, the development of the core engine is also the most important link in the development process of the engine; in the development process, engine test work is generally carried out after complete core machine test verification is completed.
Starting is the first phase in a core or engine test process. At present, the simulation calculation precision of the transition state is limited, and the engineering application cannot be met, so the starting process of the core engine or the engine generally meets the use requirement of the test through repeated debugging, and the starting oil supply experience accumulated in the core engine test is not used for reference.
In the prior art, the core machine and the engine are respectively started and debugged, and the use requirements of the test are met by repeated debugging. The method has more problems, and the main problems are as follows: one is the high risk of testing. The starting process of the engine is very complex, cold suspension can occur due to low starting oil amount to cause starting failure, overtemperature can occur due to high starting oil amount to cause turbine ablation failure, the failures can not be recovered, and the test risk is greatly increased. Secondly, the test efficiency is low. To achieve a satisfactory starting process, a lot of time is needed to carry out a starting debugging test, the progress of other test items is influenced, and the test efficiency is reduced. Secondly, the test cost is high. The large amount of time spent in starting the debugging test inevitably increases the energy consumption cost and the personnel cost, and increases the test cost.
Therefore, how to improve the test efficiency of the engine and reduce the test risk is a problem to be solved.
Disclosure of Invention
The application aims to provide a core machine-based engine starting oil supply rule design method to solve the problems of high test risk, low test efficiency and high test cost when an existing engine in the prior art is subjected to a starting test.
The technical scheme of the application is as follows: a method for designing an engine starting oil supply rule based on a core engine comprises the following steps: performing a core engine start debugging test to obtain the core engine startFuel supply power, establishing starting fuel supply W' fac And compressor outlet pressure P' 3 Proportional and high-pressure rotor reduced rotation speed n' R Relationship f 1 (n′ R ) (ii) a Obtaining an inlet temperature T of a compressor of an engine 25 Speed n converted from low voltage 1R Relationship f 2 (n 1R ) (ii) a Determining the design rule of the starting oil supply rule of the engine according to the starting oil supply rule of the core engine, and acquiring the starting oil supply rule W of the engine fac /P 3 And a high-pressure rotor reduced rotation speed n' R Speed n converted from compressor inlet 2R25 The relational expression of (1); obtaining a conversion rotating speed n 'of a high-pressure rotor' R And the converted rotating speed n of the high-pressure compressor rotor of the engine 2R Is a relational expression f 7 (n 2R ) (ii) a According to the conversion rotating speed n 'of the high-pressure rotor' R The conversion speed n of the high-pressure compressor rotor of the engine 2R Obtaining the fuel supply law W of the engine start fac /P 3 And core engine starting fuel supply law W' fac /P′ 3 The relational expression of (1); and obtaining the starting oil supply rule of the engine.
Preferably, the engine compressor inlet temperature T 25 Speed n converted from low voltage 1R The calculation method comprises the following steps:
conversion of speed n to low-pressure rotor 1R Calculating the throttling characteristic of the engine every 5 percent of step length; obtaining the inlet temperature T of the compressor of the engine according to the calculation result of the throttling characteristic of the engine 25 Speed n converted from low voltage 1R The relationship is specifically as follows:
T 25 /T 1 ＝f 2 (n 1R )
wherein, T 1 Is the engine inlet temperature; after the engine throttling characteristic is calculated, the following results are obtained:
Figure BDA0003597103190000021
preferably, the high-pressure rotor reduced rotation speed n' R Speed n converted from compressor inlet 2R25 The relation of (A) is as follows:
Figure BDA0003597103190000031
wherein, T 25DesignPoint The inlet temperature of the compressor is a design point; the starting oil supply rule of the engine is as follows:
W′ fac /W′ 3 ＝f 6 (n′ R )＝＝W fac /W 3 ＝f 6 (n 2R25 )。
preferably, the high-pressure rotor reduced rotation speed n' R And the converted rotating speed n of the high-pressure compressor rotor of the engine 2R The relation of (A) is as follows:
Figure BDA0003597103190000032
wherein, T 1 Is the engine inlet temperature.
Preferably, the engine start fueling law W fac /P 3 And core engine starting fuel supply law W' fac /P 3 The corresponding relationship of' is:
Figure BDA0003597103190000033
wherein, T 1 Is the engine inlet temperature.
Preferably, the start-up fueling law for the engine is:
when the engine is in a low speed state during starting, then:
W fac /P 3 ＝f 1 (f 7 (n 2R ))
when the engine is in a high-speed state in the starting process, then:
W fac /P 3 ＝f 1 (f 7 (n 2R ))×(f 2 (n 1R )) 0.5 。
the application relates to an engine starting oil supply rule design based on a core machineThe method comprises the steps of finding and establishing the pressure ratio of starting oil supply to an outlet of an air compressor and the converted rotating speed n 'of a high-pressure rotor by utilizing a mature core machine starting oil supply rule' R The relation between the engine starting oil supply rule and the core engine starting oil supply rule is found by the engine test run, and the relation between the engine starting oil supply rule and the core engine starting oil supply rule is found; the test risk is reduced, the test efficiency is improved, and the test cost is reduced.
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 overall flow diagram of the present application;
FIG. 2 is a schematic illustration of the core engine start-up fueling strategy of the present application;
FIG. 3 is a schematic diagram of a relationship between a compressor inlet temperature and a low-pressure reduced rotation speed of an engine according to 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.
A method for designing an engine starting oil supply rule based on a core machine is characterized in that on the basis of a mature starting oil supply rule of the core machine, the engine starting oil supply rule based on the core machine is determined by considering the pneumatic matching relation between an engine added with a low-pressure component and the core machine.
In practical engineering application, the starting mode of a core engine or an engine is divided into an open-loop starting mode and a closed-loop starting mode, and for a newly developed engine, the open-loop starting mode is generally selected in order to ensure test safety; therefore, the method mainly aims at the design of the oil supply rule of the open-loop starting mode, and relevant parameters are defined in the table 1.
TABLE 1 parameter definitions
Figure BDA0003597103190000041
Figure BDA0003597103190000051
As shown in fig. 1, the method specifically comprises the following steps:
step S100, performing a core engine starting debugging test, acquiring the core engine starting oil supply power, and establishing starting oil supply W' fac With compressor outlet pressure P 3 'ratio and high-pressure rotor reduced speed n' R Relationship f 1 (n′ R )；
As shown in FIG. 2, the core start is generally performed under normal temperature and pressure conditions, and the core start fueling law is denoted as start fueling W' fac With compressor outlet pressure P 3 'ratio and high-pressure rotor reduced speed n' R See formula (1).
W′ fac /P′ 3 ＝f 1 (n′ R ) (1)
The schematic diagram of the start-up fueling strategy for sea level standard atmospheric conditions (temperature) is shown in fig. 1.
Step S200, obtaining the inlet temperature T of the compressor of the engine 25 Speed n converted from low voltage 1R Relationship f 2 (n 1R )；
As shown in FIG. 3, the reduced rotation speed n of the low-pressure rotor is calculated by the steady-state calculation procedure under the standard atmospheric condition at sea level 1R The engine throttle characteristics are calculated every 5% step. According to the calculation result of the throttling characteristic of the engine, the relation between the inlet temperature of the compressor of the engine and the low-pressure conversion rotating speed is obtained, and the method specifically comprises the following steps:
T 25 /T 1 ＝f 2 (n 1R ) (2)
after the engine throttling characteristic is calculated, the following results are obtained:
Figure BDA0003597103190000061
step S300, determining an engine starting oil supply rule design criterion according to a core engine starting oil supply rule, and acquiring an engine starting oil supply rule W fac /P 3 And a high-pressure rotor reduced rotation speed n' R Speed n converted from compressor inlet 2R25 The relational expression of (1);
on the basis of the mature oil supply rule of the core engine starting, the design method of the oil supply rule of the engine starting is that parameters such as a common working point, an oil-gas ratio of a main combustion chamber and the like are ensured to be consistent with the core engine in the starting process and under the same conversion rotating speed, so that the oil supply rule W of the engine starting is obtained fac /P 3 And a high-pressure rotor reduced rotation speed n' R Speed n converted from compressor inlet 2R25 The relation of (1) is specifically as follows:
Figure BDA0003597103190000062
W′ 2R25 ＝f 3 (n′ R )＝＝W 2R25 ＝f 3 (n 2R25 ) (5)
π′ c ＝f 4 (n′ R )＝＝π c ＝f 4 (n 2R25 ) (6)
W′ 2R25 ＝f 5 (n′ R )×π′ c ＝＝W 2R25 ＝f 5 (n 2R25 )×π c (7)
the starting oil supply rule of the engine is as follows:
W′ fac /W 3 ＝f 6 (n′ R )＝＝W fac /W 3 ＝f 6 (n 2R25 ) (8)。
step S400, obtaining the converted rotating speed n 'of the high-pressure rotor' R And the converted rotating speed n of the high-pressure compressor rotor of the engine 2R Is a relational expression f 7 (n 2R )；
Because the inlet total temperature T of the gas compressor 25 The response constant exists, and the conversion rotating speed n of the high-pressure compressor rotor is generally selected in the process of engine test run 2R Substitute for the converted speed n of the compressor inlet 2R25 As the control parameters, specifically:
n′ R ＝n 2R25 ＝f 7 (n 2R ) (9)
Figure BDA0003597103190000071
step S500, converting the rotating speed n 'according to the high-pressure rotor' R The conversion speed n of the high-pressure compressor rotor of the engine 2R Obtaining the fuel supply law W of the engine start fac /P 3 And core engine starting fuel supply law W' fac /P 3 ' is a relational expression;
the design method of the engine starting oil supply rule is that the oil-gas ratio of the main combustion chamber is ensured to be consistent with that of a core engine under the condition of the same conversion rotating speed in the starting process, and the details are shown in a formula (8). The method can be converted into the physical mass flow of the compressed air inlet under the condition of the same air entraining proportion, and the relational expression calculation method of the starting oil supply rule of the engine and the core machine comprises the following steps:
W fac /(W 25 ×x bleed )＝W′ fac /(W′ 25 ×x′ bleed ) (11)
converting the physical mass flow of the inlet of the gas compressor into the converted flow of the inlet of the gas compressor to obtain:
Figure BDA0003597103190000072
substituting equation (7) into:
Figure BDA0003597103190000073
extracting oil supply law parameter W fac /P 3 Obtaining the relation between the engine starting oil supply rule and the core engine starting oil supply rule, and the relation is as follows:
Figure BDA0003597103190000074
Figure BDA0003597103190000075
and step S600, obtaining an engine starting oil supply rule.
When the engine is in the low speed state during starting (n) 2R Less than or equal to 35%), inlet temperature T of air compressor 25 And engine inlet temperature T 1 And (3) basically consistent, the formulas (1), (9) and (15) are sorted and combined to obtain a starting oil supply rule, and the details are shown in a formula (16):
W fac /P 3 ＝f 1 (f 7 (n 2R )) (16)
when the engine is in the high speed state during starting (n) 2R More than 35%), inlet temperature T of compressor 25 And engine inlet temperature T 1 The relation of (2), (9) and (15) is not ignored, the starting oil supply rule is obtained by arranging and combining the formulas (1), (2), (9) and (15), and the details are shown in a formula (17):
W fac /P 3 ＝f 1 (f 7 (n 2R ))×(f 2 (n lR )) 0.5 (17)。
when the starting oil supply rule of the aircraft engine is designed, the mature core engine starting oil supply rule is utilized to find out the conditions of establishing the pressure ratio of the starting oil supply to the outlet of the air compressor and the converted rotating speed n 'of the high-pressure rotor' R The relation between the inlet temperature of the air compressor of the engine and the low-pressure conversion rotating speed is obtained through steady state calculation, and then the design rule of the engine starting oil supply rule is obtained through the core engine starting oil supply rule, and the design rule is establishedAnd then, the relation between the converted rotating speed of the high-pressure rotor and the converted rotating speed of the inlet of the compressor is found through engine test, so that the relation between the engine starting oil supply rule and the core engine starting oil supply rule is found, and the engine starting oil supply rule is established.
Has the following advantages:
1) and the test risk is reduced. The method determines the starting oil supply rule of the engine on the basis of the starting oil supply rule of the core engine test, ensures that the gas compressor and the main combustion chamber of the engine have similar working states with the core engine in the starting process, and reduces the starting test risk of the engine;
2) the test efficiency is improved. Compared with the original test method, the method does not need to be debugged repeatedly, and can be completed only once according to steps, so that the starting debugging times can be reduced, and the test efficiency can be improved;
3) the test cost is reduced. The method reduces the starting and debugging times, reduces the labor cost and the energy consumption cost, and greatly reduces the test cost.
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 (6)

1. A method for designing an engine starting oil supply rule based on a core engine is characterized by comprising the following steps:
performing a core machine starting debugging test, acquiring the core machine starting oil supply power, and establishing starting oil supply W' fac And compressor outlet pressure P' 3 Proportional and high-pressure rotor reduced rotation speed n' R Relationship f 1 (n′ R )；
Obtaining an inlet temperature T of a compressor of an engine 25 Speed n converted from low voltage 1R Relationship f 2 (n 1R )；
Determining the design rule of the starting oil supply rule of the engine according to the starting oil supply rule of the core engine, and acquiring the starting oil supply rule W of the engine fac /P 3 And a high-pressure rotor reduced rotation speed n' R Speed n converted from compressor inlet 2R25 The relational expression of (1);
obtaining a conversion rotating speed n 'of a high-pressure rotor' R And the converted rotating speed n of the high-pressure compressor rotor of the engine 2R Is a relational expression f 7 (n 2R )；
According to the conversion rotating speed n 'of the high-pressure rotor' R The conversion speed n of the high-pressure compressor rotor of the engine 2R Obtaining the fuel supply law W of the engine start fac /P 3 And core engine starting fuel supply law W' fac /P′ 3 The relational expression of (1);
and obtaining the starting oil supply rule of the engine.
2. The core engine based engine start fueling strategy design method of claim 1, wherein the engine compressor inlet temperature T 25 Speed n converted from low voltage 1R The calculation method comprises the following steps:
conversion of speed n to low-pressure rotor 1R Calculating the throttling characteristic of the engine every 5 percent of step length; obtaining the inlet temperature T of the compressor of the engine according to the calculation result of the throttling characteristic of the engine 25 Speed n converted from low voltage 1R The relationship is specifically as follows:
T 25 /T 1 ＝f 2 (n 1R )
wherein, T 1 Is the engine inlet temperature; after the engine throttling characteristic is calculated, the following results are obtained:
Figure FDA0003597103180000011
3. the core engine-based engine starting fueling strategy design method of claim 1, wherein the high pressure spool reduced speed n' R Speed n converted from compressor inlet 2R25 The relation of (A) is as follows:
Figure FDA0003597103180000021
wherein, T 25DesignPoint The inlet temperature of the compressor is a design point; the starting oil supply rule of the engine is as follows:
W′ fac /W′ 3 ＝f 6 (n′ R )＝＝W fac /W 3 ＝f 6 (n 2R25 )。
4. the core engine-based engine starting fueling strategy design method of claim 1, wherein the high pressure spool reduced speed n' R And the converted rotating speed n of the high-pressure compressor rotor of the engine 2R The relation of (A) is as follows:
Figure FDA0003597103180000022
wherein, T 1 Is the engine inlet temperature.
5. The method of claim 1, wherein the engine start fueling strategy W is defined as fac /P 3 And core engine starting oil supply rule W' fac /P′ 3 The corresponding relation is as follows:
Figure FDA0003597103180000023
wherein, T 1 Is the engine inlet temperature.
6. The method for designing the engine starting fueling law as claimed in claim 1, wherein the engine starting fueling law is as follows:
when the engine is in a low speed state during starting, then:
W fac /P 3 ＝f 1 (f 7 (n 2R ))
when the engine is in a high-speed state in the starting process, then:
W fac /P 3 ＝f 1 (f 7 (n 2R ))×(f 2 (n 1R )) 0.5 。
CN202210395218.6A 2022-04-14 2022-04-14 Engine starting oil supply rule design method based on core machine Pending CN114878171A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115593654A (en) * 2022-12-09 2023-01-13 中国航发沈阳发动机研究所（Cn） Method for verifying structural characteristics of core machine of aircraft engine
CN115753131A (en) * 2022-12-09 2023-03-07 中国航发沈阳发动机研究所 Verification method for high-temperature and high-pressure environment of core engine of aircraft engine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115593654A (en) * 2022-12-09 2023-01-13 中国航发沈阳发动机研究所（Cn） Method for verifying structural characteristics of core machine of aircraft engine
CN115753131A (en) * 2022-12-09 2023-03-07 中国航发沈阳发动机研究所 Verification method for high-temperature and high-pressure environment of core engine of aircraft engine
CN115753131B (en) * 2022-12-09 2023-09-22 中国航发沈阳发动机研究所 High-temperature high-pressure environment verification method for aircraft engine core engine

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