A flow test method for the detection of dynamic fuel nozzles of aero-engines

Abstract

A flow test method for detecting the inspection of dynamic fuel nozzles of aero-engines. Through an oil circuit connector, the flow of the nozzle under test is measured with a standard nozzle as a reference. The oil circuit connector is a symmetric U-shaped pipeline, with the middle part connected to the oil supply pipeline. The two ends of the U-shaped pipe are provided with internal threaded holes, which can be connected to the standard fuel nozzle and the fuel nozzle to be tested. Needle valves for adjusting the flow rate are provided at both ends of the U-shaped pipe. By adjusting the needle valves, the flow velocities at both ends of the U-shaped pipe are made consistent. By comparing the flows of the nozzle under test and the working standard nozzle on the oil circuit connector and calculating the relative error, the flow value of the nozzle under test in the simulated laboratory is converted, ensuring the consistency of the processing of fuel nozzles. A solution is proposed for the problems of low accuracy and poor consistency in the inspection and testing of current fuel nozzle products, ensuring the accuracy and consistency of the inspection and measurement of aero-engine fuel nozzle products, guaranteeing the processing accuracy of fuel nozzles, and improving the combustion efficiency of aircraft engine fuel.

Description

Technical Field

[0001] The present invention belongs to the technical field of aero-engine detection, and particularly relates to a flow test method for detecting the product quality of dynamic fuel nozzles of aero-engines. Background Art

[0002] Currently, the testing technologies for aero-engine fuel nozzles are divided into two categories:

[0003] 1. By measuring the internal geometric dimensions of the fuel nozzle, problems in processing are found to ensure the consistency of the geometric dimensions of the fuel nozzle.

[0004] The consistency of geometric dimensions cannot ensure the consistency of the ejection flow rate of the fuel nozzle during actual operation. Moreover, ensuring the consistency of fuel nozzle processing by measuring geometric dimensions is too costly and poses challenges to the consistency of nozzle materials, the advancement of processing equipment, and the accuracy of measuring equipment.

[0005] 2. Under the conditions of the laboratory environment, i.e., the pressure, pressure difference, pressure, ambient temperature and humidity, fuel medium, etc. specified by the process, the flow rate of the fuel nozzle to be processed is measured. To ensure the consistency of the conditions related to the flow rate measurement of the fuel nozzle during the measurement process, or within the specified range, a standard nozzle is used to adjust the measurement system of the fuel nozzle. When the measurement result of the flow rate value of the nozzle is within the processing technology requirements range, it is considered that the conditions are reliable and the flow rate test of the nozzle can be carried out.

[0006] Since in actual measurement, the flow rate measurement of the fluid is an instantaneous dynamic value and the measurement results are not comparable. Therefore, the above two methods cannot solve the accuracy and consistency of the measurement of engine fuel nozzles. Summary of the Invention

[0007] To solve the above technical problems, the present invention provides a flow test method for detecting the product quality of dynamic fuel nozzles of aero-engines.

[0008] The present invention is achieved through the following technical solutions.

[0009] A flow test method for detecting aero-engine dynamic fuel nozzle products provided by the present invention uses an oil circuit connector for flow testing. The oil circuit connector is a symmetric U-shaped pipeline, the middle of which is connected to the oil supply pipeline. The two ends of the U-shaped pipe are provided with internal threaded holes and can be connected to the fuel nozzle standard part and the fuel nozzle to be tested. When conducting the test, the following steps are included:

[0010] Step 1, respectively install the fuel nozzle standard part and the fuel nozzle to be measured at both ends of the U-shaped pipe of the oil circuit connector;

[0011] Step 2: Install the flow meters at the rear ends of the nozzle standard part and the fuel nozzle to be measured respectively. Open the fuel supply pipeline to supply fuel. After the fuel flows stably in the fuel nozzle standard part and the fuel nozzle to be measured, measure the fuel flow rates of the fuel nozzle standard part and the fuel nozzle to be measured respectively through the flow meters, and obtain the flow rates of the fuel nozzle standard part and the fuel nozzle to be measured at this time as Q1’ and Q n ’;

[0012] Step 3: Calculate the flow rate of the fuel nozzle to be measured. The calculation method is as follows:

[0013] The flow rate Q of the nozzle to be measured n ’s relative error δ with respect to the fuel nozzle standard part is:

[0014]

[0015] Given that the flow rate of the fuel nozzle standard part is Q1, then the flow rate Q of the fuel nozzle to be measured n = δ × Q1 + Q1;

[0016] Step 4: Replace the fuel nozzle to be measured, and repeat Step 2 to Step 3 until all the fuel nozzles to be measured are tested.

[0017] Furthermore, the flow rate Q1 of the fuel nozzle standard part is the standard value measured in the laboratory environment.

[0018] Furthermore, a needle valve for adjusting the flow rate is provided on each of the two U-shaped pipelines at both ends of the oil circuit connector.

[0019] Furthermore, when selecting the fuel nozzle standard part, three nozzles of the same model with the same processing technology are used to determine the flow rate through simulating the laboratory environment, and any one of them is selected as the working standard nozzle to obtain its flow rate Q1, and the other two are used as the traceability standards in the transfer process.

[0020] Furthermore, the external direct measurement method is used for flow rate measurement in Step 2.

[0021] Furthermore, the flow meter used for flow rate measurement in Step 2 is a mass flow meter.

[0022] Furthermore, when the fuel sprayed from the fuel nozzle standard part and the fuel nozzle to be measured is in a non-atomized state, a turbine flow meter is used for measurement.

[0023] Furthermore, the fuel nozzle standard part and the fuel nozzle to be measured are of the same model.

[0024] The beneficial effects of the present invention are as follows: Through the implementation of the present invention, a new measurement method is proposed for the problems of test accuracy and consistency in the fuel nozzle flow rate test under process requirements (fixed parameters), which can ensure the accuracy and consistency of the detection and measurement results of the engine fuel nozzle. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of the oil circuit connector used in the present invention:

[0026] 1 - oil circuit connector, 2 - fuel nozzle standard part, 3 - fuel nozzle to be tested, 4 - needle valve. DETAILED DESCRIPTION OF THE INVENTION

[0027] The technical solution of the present invention will be further described below, but the scope of protection is not limited thereto.

[0028] The method of the present invention is mainly carried out according to the measurement principle of the oil circuit connector. As shown in Figure 1 the oil circuit connector 1 in the figure, which is a symmetrical U-shaped pipeline, is connected with an oil inlet pipe in the middle. The oil inlet pipe is connected with the oil supply pipeline. The two ends of the U-shaped pipe are provided with internal threaded holes, which can be connected with the fuel nozzle standard part and the fuel nozzle to be tested. Needle valves 4 are also provided on the two ends of the U-shaped pipe.

[0029] During measurement, assume there are three fuel nozzles 1, 2, and 3 of the same model. Fuel nozzle 1 is fixedly installed at one end, and fuel nozzles 2 and 3 are respectively placed at the other end. Open the needle valve to make the U-shaped pipe fully flowing. Measure the flow rates of the fuel nozzles 1 and 2 and the flow rates of the fuel nozzles 1 and 3 respectively. Assume the obtained flow rate values are a, b and a', c respectively. Calculate the relative error δ1 of fuel nozzle 2 relative to fuel nozzle 1 and the relative error δ2 of fuel nozzle 3 relative to fuel nozzle 1 respectively.

[0030]

[0031] At this time, the ratio between the flow rate values of fuel nozzle 2 and fuel nozzle 3 is:

[0032]

[0033] Subsequently, connect fuel nozzle 2 and fuel nozzle 3 to both ends of fuel nozzle 1 respectively, and adjust the needle valve 4 to ensure that the flow rate measurement results of fuel nozzle 2 and fuel nozzle 3 are consistent with the calculated values. Only then can the nozzle flow rate be measured.

[0034] As shown in Figure 1As shown in the figure, a flow test method for the dynamic fuel nozzle product detection of an aero-engine uses an oil circuit connector 1 for flow test. The oil circuit connector 1 is a symmetric U-shaped pipeline, connected to the oil supply pipeline in the middle, and internal threaded holes are provided at both ends of the U-shaped pipe, which can be connected to the fuel nozzle standard part and the fuel nozzle to be tested; when conducting the test, it includes the following steps:

[0035] Step 1, install the fuel nozzle standard part 2 and the fuel nozzle 3 to be tested at both ends of the U-shaped pipe of the oil circuit connector 1 respectively;

[0036] Step 2, install the flow meters at the rear ends of the nozzle standard part 2 and the fuel nozzle 3 to be tested respectively. Open the oil supply pipeline to supply fuel. After the fuel flow rates of the fuel nozzle standard part 2 and the fuel nozzle 3 to be tested are stable, measure the flow rates of the fuel nozzle standard part 2 and the fuel nozzle 3 to be tested through the flow meters respectively, and obtain the flow rates of the fuel nozzle standard part 2 and the fuel nozzle 3 to be tested at this time as Q1’ and Q n ’; The external direct measurement method is used for flow measurement; The flow meter used is a mass flow meter;

[0037] Step 3, calculate the flow rate of the fuel nozzle 3 to be tested. The calculation method is as follows:

[0038] The flow rate Q n ’ of the fuel nozzle 3 to be tested relative to the relative error δ of the fuel nozzle standard part 2 is:

[0039]

[0040] Given that the flow rate of the fuel nozzle standard part 2 is Q1, then the flow rate Q n of the fuel nozzle 3 to be tested = δ×Q1 + Q1; The flow rate Q1 of the fuel nozzle standard part is the standard value measured in the laboratory environment;

[0041] Step 4, replace the fuel nozzle 3 to be tested, and repeat Step 2 to Step 3 until all the fuel nozzles to be tested are completed.

[0042] A needle valve 4 for adjusting the flow rate is provided on each of the two U-shaped pipelines at both ends of the oil circuit connector 1.

[0043] When selecting the fuel nozzle standard part 2, three nozzles of the same model with the same processing technology are used to determine the flow rate through simulating the laboratory environment, and any one of them is selected as the working standard nozzle to obtain its flow rate Q1, and the other two are used as the traceability standards in the transfer process.

[0044] When the fuel sprayed by the fuel nozzle standard part 2 and the fuel nozzle 3 to be tested is in a non-atomized state, a turbine flow meter is used for measurement.

[0045] Select three nozzles of the same model with the same processing technology as the standard. Through the simulation laboratory (working conditions required by the process), set the flow rate of these three nozzles. The nozzles selected as the standard after setting are used as the standard parts for the quantity transfer basis, and compare the nozzles to be measured during processing to measure the flow rate value of the nozzle to be measured under the working conditions required by the process.

[0046] Use one of them as the working standard nozzle, and use the other two as the traceability standards for the transfer process (the traceability standards are only used to examine the repeatability and stability of the working standard nozzle).

[0047] This measurement method must ensure that the fuel nozzle standard part 2 and the fuel nozzle 3 to be measured are of the same model. If the fuel nozzle standard part 2 and the fuel nozzle 3 to be measured are not of the same model, it can also be used to examine the consistency of the fuel nozzle 3 to be measured, but the nozzle flow rate under laboratory conditions cannot be obtained.

Claims

1. A flow test method for the detection of dynamic fuel nozzles of aero-engines, characterized in that: Use an oil circuit connector for flow rate testing. The oil circuit connector is a symmetric U-shaped pipeline, with the middle connected to the oil supply pipeline. There are internal threaded holes at both ends of the U-shaped pipe, which can be connected to the fuel nozzle standard part and the fuel nozzle to be tested. When conducting the test, it includes the following steps: Step 1: Install the fuel nozzle standard part and the fuel nozzle to be tested at both ends of the U-shaped pipe of the oil circuit connector respectively. Step 2: Install the flowmeter at the rear end of the nozzle standard part and the fuel nozzle to be measured respectively. Open the fuel supply pipeline to supply fuel. After the fuel flow rates of the nozzle standard part and the fuel nozzle to be measured are stable, measure the flow rates of the nozzle standard part and the fuel nozzle to be measured through the flowmeter respectively, and obtain the flow rates of the nozzle standard part and the fuel nozzle to be measured at this time as Q1’ and Q n ’; Step 3: Calculate the flow rate of the fuel nozzle to be tested. The calculation method is as follows: The flow rate Q of the fuel injector under test n The relative error δ of the flow rate with respect to the standard fuel injector is as follows: Given that the flow rate of the known fuel nozzle standard part is Q1, then the flow rate Q of the fuel nozzle to be measured n = δ × Q1 + Q1; Step 4: Replace the fuel nozzle to be tested, and repeat Step 2 to Step 3 until all the fuel nozzles to be tested are completed.

2. The flow rate test method for the dynamic fuel nozzle product detection of an aeroengine according to claim 1, characterized in that: The flow rate Q1 of the fuel nozzle standard part is the standard value measured in the laboratory environment.

3. The flow rate test method for the dynamic fuel nozzle product detection of an aeroengine according to claim 1, characterized in that: There is a needle valve for adjusting the flow rate on each U-shaped pipeline at both ends of the oil circuit connector.

4. The flow rate test method for the dynamic fuel nozzle product detection of an aeroengine according to claim 1, characterized in that: When selecting the fuel nozzle standard part, use three nozzles of the same model with the same processing technology to determine the flow rate through simulating the laboratory environment, and select any one of them as the working standard nozzle to obtain its flow rate Q1, and the other two are used as the traceability standards in the transfer process.

5. The flow rate test method for the dynamic fuel nozzle product detection of an aeroengine according to claim 1, wherein: In Step 2, the external direct measurement method is used for flow rate measurement.

6. The flow rate test method for the dynamic fuel nozzle product detection of an aeroengine according to claim 1, characterized in that: The flow meter used in Step 2 for flow rate measurement is a mass flow meter.

7. The flow rate test method for the dynamic fuel nozzle product detection of an aeroengine according to claim 1, characterized in that: When the fuel sprayed by the fuel nozzle standard part and the fuel nozzle to be tested is in a non-atomized state, a turbine flow meter is used for measurement.

8. The flow rate test method for the dynamic fuel nozzle product detection of an aeroengine according to claim 1, wherein: The fuel nozzle standard part and the fuel nozzle to be tested are of the same model.

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