A turbine engine fuel system starved oil test device and method

Abstract

The present application belongs to the technical field of aero-engine performance test, and particularly relates to a turbine engine fuel system oil deficiency test device and test method. The present application makes the fuel in the turbine engine fuel system reach the specified oil deficiency state quickly without reducing the cleanliness of the engine fuel system; the oil deficiency starting test does not consume the firework, saves resources, and shortens the test cycle.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of aero-engine performance test, and particularly relates to a turbine engine fuel system oil loss test device and test method. BACKGROUND

[0002] The turbine engine has a long storage period. As the storage time increases, the sealing performance of the sealing member decreases, the oil loss amount of the oil seal in the fuel system increases, a large amount of oil is lost from the oil seal, and engine starting failure is caused. In order to determine the influence of engine oil loss on starting, verify improvement measures, etc., a large number of oil loss state starting tests need to be performed. After the fuel system of the engine is filled with oil, the relevant fuel pipeline is removed, the fuel in the pipeline is discharged, and then assembly is realized to achieve an oil loss state. The oil loss amount cannot be controlled, the oil loss position is limited, the pyrotechnics are consumed each time the oil loss starting test is performed, the test period is long, and a large amount of waste is caused. Moreover, the test purpose cannot be achieved. Therefore, an efficient engine fuel system oil loss test method with controllable oil loss amount and unrestricted oil loss position needs to be designed. SUMMARY

[0003] OBJECTIVE OF THE INVENTION

[0004] The existing turbine engine fuel system oil loss test technology cannot control the oil loss amount, the oil loss position is limited, pyrotechnics are consumed each time the oil loss starting test is performed, the test period is long, a large amount of waste is caused, and the test purpose cannot be achieved. The purpose of the present application is to quickly achieve the required oil loss state in the specified position of the turbine engine fuel system without reducing the cleanliness grade of the fuel system, and to be used for turbine engine fuel system oil loss starting test. The oil loss starting test does not consume pyrotechnics, saves resources, and shortens the test period.

[0005] TECHNICAL SCHEME

[0006] The present application designs a turbine engine fuel system oil loss test device. The test device comprises a gas supply assembly, an oil supply assembly, and a plurality of detection interfaces. Any one detection interface comprises a first interface and a second interface, which are both preset on the engine fuel system. The first interface is the interface of the oil loss position of the engine fuel system, and the second interface is the interface of the oil collection position of the engine fuel system.

[0007] During the test, the oil supply assembly supplies full fuel to the engine fuel system. One end of the gas supply assembly is connected to a high-purity nitrogen gas source, and the other end is connected to the first interface and delivers a certain amount of high-purity nitrogen gas to the engine fuel system. At the same time, the second interface is connected to a fuel collection device for quantitative detection.

[0008] Further, the gas supply assembly comprises a high-purity nitrogen cylinder, a pressure regulating valve and a stop valve connected in sequence through conduits, the outlet of the stop valve is connected to the interface of the oil deficiency part of the engine fuel system, the outlet of the pressure regulating valve is provided with a pressure gauge for detecting the gas pressure delivered to the engine fuel system; the pressure regulating valve is used for regulating the delivery gas pressure.

[0009] Further, a filter is arranged on the pipeline between the pressure regulating valve and the stop valve, for further filtering the impurities in the delivered gas, to ensure the purity of the gas delivered into the engine fuel system.

[0010] Further, the oil supply assembly comprises an oil supply pipe and an electromagnetic valve, one end of the oil supply pipe is connected to the oil supply end of the vehicle platform, and the other end is connected to the engine fuel system for oil supply, and the electromagnetic valve is arranged on the oil supply pipe and is in a closed state after oil supply is completed, to ensure that the engine fuel system forms a sealed cavity.

[0011] On the basis of the design of the above-mentioned test device, the application further provides a turbine engine fuel system oil deficiency test, and the test method comprises the following steps:

[0012] Step S1, the engine test vehicle makes the sealed cavity of the fuel system full of fuel;

[0013] Step S2, the outlet of the high-purity nitrogen cylinder is connected to an air filter, the outlet of the air filter is connected to a stop valve, and then the stop valve and the outlet valve of the nitrogen cylinder are opened in sequence, the outlet pressure of the nitrogen cylinder is maintained, the pipeline is closed after the air in the pipeline is discharged, and the pipeline is filled with nitrogen;

[0014] Step S3, the outlet of the stop valve is connected to the interface of the oil deficiency part of the engine fuel system, and then the interface of the engine fuel system for collecting fuel is opened, and a collection conduit is connected;

[0015] Step S4, the stop valve is opened, the outlet pressure of the nitrogen cylinder is adjusted to (0.01-0.04) Mpa, and the fuel discharged from the engine fuel system is collected and measured to a specified amount by using a measuring cup;

[0016] Step S5, the stop valve is closed, the connection between the stop valve and the interface is disconnected, the interface of the engine fuel system for collecting fuel is blocked, and the interface of the engine fuel system connected to the stop valve is blocked;

[0017] Step S6, the outlet of the stop valve is connected to the interface of another oil deficiency part of the engine fuel system, and then another interface of the engine fuel system for collecting fuel is opened, and a collection conduit is connected; steps S4 to S5 are repeated until the fuel in the engine fuel system reaches a specified oil deficiency state.

[0018] Further, the detection interface can be two or more, and the number of detection interfaces is determined according to the oil deficiency position and the oil deficiency amount in the engine fuel system; until the fuel in the engine fuel system reaches the specified oil deficiency state, i.e., the collected fuel amount meets the specified requirement.

[0019] Further, in the above test method, the electromagnetic valve fuel pollution degree, the nitrogen purity, the filtration precision, and the fuel pollution degree all need to meet the test requirements.

[0020] The present application has the following beneficial technical effects:

[0021] The turbine engine oil deficiency test method can make the fuel in the turbine engine fuel system reach the specified oil deficiency state quickly without reducing the cleanliness of the engine fuel system; the oil deficiency start test does not consume pyrotechnics, saves resources, and shortens the test cycle.

[0022] The test method can quickly and accurately realize quantitative oil deficiency in the specified position of the engine fuel system; the air filter is used to specially clean and control the nitrogen, which does not reduce the cleanliness grade of the fuel system; the electromagnetic valve is installed at the inlet of the engine fuel system, and the engine fuel system forms a sealed cavity after the electromagnetic valve is closed, thereby avoiding the interference of the external environment. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The figure is a structural principle diagram of a turbine engine fuel system oil deficiency test device. DETAILED DESCRIPTION

[0024] The present application provides a turbine engine fuel system oil deficiency test method aiming at the oil deficiency state that needs to be reached before the oil deficiency start test of the turbine engine fuel system, and the test method is performed on the basis of the test device as shown in Figure 1 The test device includes a high-purity nitrogen cylinder for air supply, a pressure regulating valve, a pressure gauge, a filter, a stop valve, a two-position two-way electromagnetic valve, and oil and air supply pipelines, and the specific test process is as follows:

[0025] Step one: a two-position two-way normally closed electromagnetic valve is used, the electromagnetic valve flow is not less than the engine fuel consumption, and the electromagnetic valve fuel pollution degree is not worse than GJB 420B-7B / 7C / 7D / 7E / 7F grade.

[0026] Step two: a high-purity nitrogen cylinder (nitrogen requirement is not less than “High-purity nitrogen” GB / T 8980) is used, the outlet pressure can be adjusted within 0.01 MPa-0.4 MPa, an air filter with a filtration precision of not more than 10 μm is used, a stop valve and a plurality of conduits are used; the stop valve and the conduits are cleaned, and the fuel pollution degree of the stop valve and the conduits is not worse than GJB 420B-7B / 7C / 7D / 7E / 7F grade;

[0027] Step three, install an electromagnetic valve at the fuel inlet of the fuel system of the turbine engine, which forms a sealed cavity in the fuel system of the engine when closed;

[0028] Step four, fill the sealed cavity in the fuel system of the engine with fuel during engine test run;

[0029] Step five, connect the outlet of the nitrogen cylinder to an air filter, and the outlet of the air filter to a stop valve. Then, open the stop valve and the outlet valve of the nitrogen cylinder in sequence, and set the outlet pressure of the nitrogen cylinder to (0.01-0.04) MPa. After removing the air in the pipeline, close the stop valve, and fill the pipeline with nitrogen.

[0030] Step six, connect the outlet of the stop valve to the interface at the oil deficiency site of the fuel system of the engine (which should be designed and processed in advance), and then unscrew or open the interface of the fuel system for collecting fuel, and connect the collection conduit.

[0031] Step seven, open the stop valve, set the outlet pressure of the nitrogen cylinder to (0.01-0.04) MPa, and use a measuring cup to collect and measure the fuel discharged from the fuel system of the engine to the specified amount.

[0032] Step eight, close the stop valve, screw the cover on the interface of the fuel system for collecting fuel, and remove the stop valve, screw the cover on the interface of the fuel system connected to the stop valve.

[0033] Step nine, connect the outlet of the stop valve to the interface at another oil deficiency site of the fuel system of the engine (which should be designed and processed in advance), and then unscrew or open another interface of the fuel system for collecting fuel, and connect the collection conduit. Repeat steps seven to eight until the fuel in the fuel system of the engine reaches the specified oil deficiency state.

[0034] Embodiment

[0035] For example, as shown in the following table, the oil deficiency test of the fuel system of a certain turbine engine is carried out, and the specific implementation process is as follows. Figure 1

[0036] a. Select a two-position two-way normally closed electromagnetic valve with a flow rate of (0-500) L / h, and the fuel pollution degree of the electromagnetic valve is not worse than GJB 420B-7B / 7C / 7D / 7E / 7F level.

[0037] b. Select a high-purity nitrogen cylinder (the nitrogen meets the requirements of "High-purity Nitrogen" GB / T 8980), and the outlet pressure is adjusted to 0.01-0.4 MPa. Select an air filter with a filtration precision of not more than 10 μm, a stop valve, and five conduits. Clean the stop valve and the conduits, and the fuel pollution degree of the stop valve and the conduits is not worse than GJB 420B-7B / 7C / 7D / 7E / 7F level.​

[0038] c. Install electromagnetic valve at fuel inlet of fuel system of turbine engine;

[0039] d. Run engine to 95% of rated speed, and fill the sealed cavity of fuel system with fuel by hot running;

[0040] e. Connect air filter to outlet of nitrogen cylinder, and connect stop valve to outlet of air filter. Open stop valve and outlet valve of nitrogen cylinder in sequence, and set pressure of outlet of nitrogen cylinder to (0.01-0.02) Mpa. Close stop valve after removing air in pipeline.

[0041] f. Connect outlet of stop valve to interface 1 (previously designed and processed) at fuel system of engine, and unscrew interface 2 at fuel system of engine for collecting fuel, and connect collecting pipeline.

[0042] g. Open stop valve, and set pressure of outlet of nitrogen cylinder to (0.01-0.02) Mpa. Collect and measure fuel discharged from fuel system of engine to G1 ml by measuring cup.

[0043] h. Close stop valve, screw plug to interface 2 at fuel system of engine for collecting fuel, remove stop valve, and screw plug to interface 1 at fuel system of engine connected to stop valve.

[0044] i. Connect outlet of stop valve to interface 3 (previously designed and processed) at fuel system of engine for collecting fuel, and unscrew interface 4 at fuel system of engine for collecting fuel, and connect collecting pipeline. Repeat steps g to h until fuel in fuel system of engine reaches (G1+G2) ml.

[0045] In the above embodiment, G1 and G2 refer to fuel deficiency at two positions in fuel system of engine. Fuel deficiency at interface 1 and interface 3 respectively meets the requirement. Fuel deficiency is usually the minimum fuel consumption of corresponding position of engine during start-up according to experience of engine. Total fuel deficiency at interface 3 also meets the requirement. Interface 1 and interface 2 refer to inlets of nitrogen at positions for establishing fuel deficiency, which are usually selected at higher positions. Interface 3 and interface 4 refer to outlets of fuel at positions for establishing fuel deficiency, which are usually selected at lower positions.

[0046] The above specific embodiments or cases are only used to explain and illustrate the technical solutions of the present application, and are not intended to limit the present application, and the parts not described in detail are regarded as conventional technical means or public common knowledge in the art; it should be understood by those skilled in the art that based on the design idea of the present application, the technical solutions recorded in the foregoing embodiments can be adaptively modified, or part or all of the technical features can be replaced by equivalents, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A turbine engine fuel system starved oil test apparatus, characterized by, The test device comprises a gas supply assembly, an oil supply assembly, and a plurality of groups of detection interfaces; any one group of detection interfaces comprises a first interface and a second interface, which are both preset on the engine fuel system; the first interface is an interface of an oil deficiency position of the engine fuel system, and the second interface is an interface of a fuel collection position of the engine fuel system; During the test, the oil supply assembly supplies full fuel to the engine fuel system; one end of the gas supply assembly is connected to a high-purity nitrogen gas source, and the other end is connected to the first interface and used for conveying a certain amount of high-purity nitrogen gas to the engine fuel system; meanwhile, the second interface is connected to a fuel collection device for quantitative detection.

2. The turbine engine fuel system starved oil test apparatus of claim 1, wherein, The gas supply assembly comprises, in sequence through a pipeline, a high-purity nitrogen gas cylinder, a pressure regulating valve, and a stop valve; the outlet of the stop valve is connected to the interface of the oil deficiency position of the engine fuel system; the outlet of the pressure regulating valve is provided with a pressure gauge for detecting the gas pressure conveyed to the engine fuel system; and the pressure regulating valve is used for adjusting the gas pressure.

3. The turbine engine fuel system starved oil test apparatus of claim 2, wherein, A filter is further arranged on the pipeline between the pressure regulating valve and the stop valve, which is used for further filtering impurities in the conveyed gas and ensuring the purity of the gas conveyed into the engine fuel system.

4. The turbine engine fuel system starved oil test apparatus of claim 1, wherein, The oil supply assembly comprises an oil supply pipeline and an electromagnetic valve; one end of the oil supply pipeline is connected to a vehicle platform fuel supply end, and the other end is connected to the engine fuel system for oil supply; and the electromagnetic valve is arranged on the oil supply pipeline and is in a closed state after oil supply is completed to ensure that the engine fuel system forms a sealed cavity.

5. The turbine engine fuel system starved oil test apparatus of claim 1, wherein, The first interface is arranged at a higher position of the engine fuel system, and the second interface is arranged at a lower position of the engine fuel system.

6. The turbine engine fuel system starved oil test apparatus of claim 1, wherein, The fuel collection device is a measuring cup connected to the second interface through a collection pipeline.

7. A method of testing a turbine engine fuel system for a lack of fuel, the method comprising: The test method comprises the following steps: Step S1: the engine is tested to make the sealed cavity of the fuel system full of fuel; Step S2: the outlet of the high-purity nitrogen gas cylinder is connected to an air filter, the outlet of the air filter is connected to the stop valve, the stop valve and the outlet valve of the nitrogen gas cylinder are opened in sequence, the outlet pressure of the nitrogen gas cylinder is maintained, the pipeline is closed after air in the pipeline is discharged, and the pipeline is filled with nitrogen; Step S3: the outlet of the stop valve is connected to the interface of the oil deficiency position of the engine fuel system, the interface of the fuel collection position of the engine fuel system is opened, and a collection pipeline is connected; Step S4: the stop valve is opened, the outlet pressure of the nitrogen gas cylinder is set to (0.01-0.04) Mpa, and the fuel discharged from the engine fuel system is collected and measured to a specified amount by using a measuring cup; Step S5: the stop valve is closed, the connection between the stop valve and the interface is disconnected, the interface of the fuel collection position of the engine fuel system is blocked, and the interface of the engine fuel system connected to the stop valve is blocked; Step S6: the outlet of the stop valve is connected to another interface of the oil deficiency position of the engine fuel system, another interface of the fuel collection position of the engine fuel system is opened, and a collection pipeline is connected; steps S4 to S5 are repeated until the fuel in the engine fuel system reaches a specified oil deficiency state.

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