A standard nozzle flow setting method for an aeroengine

Abstract

The application discloses a standard nozzle flow calibration method for an aero-engine, which uses two measured nozzles in a laboratory environment as traceable standards and uses an oil line communicator to connect and calibrate, the oil line communicator is a symmetrical U-shaped pipeline, the middle part is connected with an oil supply pipeline, and the two ends of the U-shaped pipeline are provided with internal thread holes, the flow of the traceable nozzle and the working standard nozzle on the oil line communicator is compared, the relative error is calculated, and the flow value of the working standard nozzle in the simulation laboratory is converted, the application provides a reliable aero-engine fuel nozzle calibration method, the flow of the nozzle can be measured in a non-laboratory environment, the measurement is reliable and stable, and the efficiency of nozzle flow measurement is greatly improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of aero-engine detection, and particularly relates to a standard nozzle flow calibration method for an aero-engine. BACKGROUND

[0002] Currently, in the nozzle flow test process of an aero-engine, the actual flow value of the nozzle in the laboratory environment needs to be measured, and the flow calibration method of the standard nozzle used is not clearly specified. In the actual processing process, the flow value of the standard nozzle cannot be obtained in the laboratory environment, and therefore, it is urgent to provide a convenient and fast standard nozzle flow calibration method. SUMMARY

[0003] To solve the above technical problems, the application provides a standard nozzle flow calibration method for an aero-engine.

[0004] The application is implemented through the following technical solutions.

[0005] The application provides a standard nozzle flow calibration method for an aero-engine, which comprises the following steps:

[0006] Step 1: adjust the environmental conditions to the laboratory measurement environment specified by the nozzle process;

[0007] Step 2: select three nozzles processed by the same process, select two nozzles, and use a straight pipe flow device to measure the flow of the two nozzles to obtain the flow values of the corresponding nozzles, which are a and b respectively;

[0008] Step 3: use an oil line connector to connect, the oil line connector is a symmetrical U-shaped pipeline, the middle part is connected with the oil supply pipeline, and the two ends of the U-shaped pipeline are provided with internal thread holes, and the two nozzles measured are respectively installed at the two ends of the oil line connector;

[0009] Step 4: install flowmeters at the rear ends of the two nozzles respectively, open the oil supply pipeline to supply fuel, and after the fuel flow of the two nozzles installed in the oil line connector is stable, measure the flow of the two nozzles through the flowmeters respectively to obtain the flow values of the corresponding nozzles at this time, which are a' and b' respectively;

[0010] Step 5: compare the values of a / b and a' / b', if they are not the same, repeat steps 2 to 5; if they are the same, select the corresponding two nozzles as the traceable standard, the flow values of the two nozzles are a and b, and the nozzle not measured is used as the working standard and enters the next step;

[0011] Step six, select the flow value of the nozzle as a, install the nozzle as a working standard nozzle at both ends of the oil circuit connector, and install the flow meter at the rear end of the two nozzles, open the fuel supply pipeline, and measure the flow of the two nozzles through the flow meter when the fuel flow of the two nozzles installed at the oil circuit connector is stable, and the flow values of the corresponding nozzles at this time are a'' and c' respectively;

[0012] Step seven, calculate the flow of the working standard nozzle, the calculation method is as follows:

[0013] The relative error δ of the flow of the nozzle with the flow value of a relative to the flow of the working standard nozzle is δ= (c'-a'') / a'';

[0014] Then the flow c of the working standard nozzle is c=δ×a+a.

[0015] Further, the U-shaped pipeline at both ends of the oil circuit connector is provided with a needle valve for adjusting the flow size.

[0016] Further, the flow measurement in steps two, four and six uses an external direct measurement method for flow measurement.

[0017] Further, the flow meter used for flow measurement in steps two, four and six is a mass flow meter.

[0018] Further, the two nozzles of the traceable standard determined in step five are stored in a temperature environment with a temperature of 20±5℃ to reduce the change in flow value caused by deformation wear and the like.

[0019] Further, the two nozzles of the traceable standard determined in step five need to be regularly mutual calibrated, and when the mutual calibration result changes, steps two to five need to be repeated to revalue.

[0020] Further, when the fuel sprayed by the nozzle is in a non-atomized state, a turbine flow meter is used for measurement.

[0021] Further, the straight connection type pipeline connector is connected to the fuel supply pipeline at the upper end, and is provided with an internal thread at the lower end, which can be connected with the nozzle.

[0022] The beneficial effects of the present application are that through the implementation of the present application, a reliable aviation engine fuel nozzle value determination method is provided, which can measure the flow of the nozzle in a non-laboratory environment, the measurement is reliable and stable, and the efficiency of the nozzle flow measurement is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural schematic view of the oil circuit connector of the present application;

[0024] Figure 2 Figure 1 is a schematic diagram of a direct connection pipeline flow device structure of the present application;

[0025] Figure 1 is a schematic diagram of a direct connection pipeline flow device structure of the present application; DETAILED DESCRIPTION

[0026] The technical solutions of the present application are described further below, but the scope of protection is not limited to the description.

[0027] A standard nozzle flow calibration method for an aero-engine includes the following steps:

[0028] Step one, adjust the environmental conditions to the laboratory measurement environment specified by the nozzle process; use a qualified nozzle in the production process, or a designated standard part in the production as a standard for flow measurement under the same conditions as the laboratory (process specified conditions). Adjust the environmental conditions, including (pressure, pressure difference, flow rate, fuel density, ambient temperature, ambient humidity, barometric pressure change…) and other comprehensive factors;

[0029] Step two, select three nozzles of the same process, select two nozzles, and use the direct connection pipeline flow device 33 as shown in Figure 2 to measure the flow of the two nozzles respectively, obtaining the flow values of the corresponding nozzles as a and b respectively;

[0030] Step three, use the oil passage connector 11 as shown in Figure 1 to connect, the oil passage connector 11 is a symmetrical U-shaped pipeline, the middle part is connected with the oil supply pipeline, and the two ends of the U-shaped pipeline are provided with internal threaded holes, and the two nozzles measured are respectively installed at the two ends of the oil passage connector 1;

[0031] Step four, install flow meters at the rear ends of the two nozzles, open the oil supply pipeline to supply fuel, and after the fuel flow of the two nozzles installed in the oil passage connector 1 is stable, measure the flow of the two nozzles through the flow meters respectively, obtaining the flow values of the corresponding nozzles at this time as a' and b' respectively;

[0032] Step five, compare the values of a / b and a' / b', if they are not the same, repeat steps two to five; if they are the same, select the corresponding two nozzles as the traceable standard, and the flow values of the two nozzles are a and b, and the nozzle not measured is used as the working standard and enters the next step;

[0033] Step six, select the flow value of the nozzle as a, install the nozzle as a working standard nozzle at both ends of the oil circuit connector 1 respectively, and install flow meters at the rear ends of the two nozzles respectively, open the fuel supply pipeline to supply fuel, and measure the flow of the two nozzles through the flow meters respectively after the fuel flow of the two nozzles installed at the oil circuit connector 1 is stable, and the flow values of the corresponding nozzles at this time are a'' and c' respectively.

[0034] Step seven, calculate the flow of the working standard nozzle, and the calculation method is as follows:

[0035] The relative error δ of the flow of the nozzle with the flow value of a relative to the flow of the working standard nozzle is δ=(c'-a'') / a'';

[0036] Then the flow c of the working standard nozzle is c=δ×a+a.

[0037] The U-shaped pipeline at both ends of the oil circuit connector 1 is provided with a needle valve 2 for adjusting the flow size.

[0038] The flow measurement in steps two, four and six is performed by using an external direct measurement method.

[0039] The flow meter used in the flow measurement in steps two, four and six is a mass flow meter.

[0040] The two nozzles of the traceability standard determined in step five are stored in a temperature environment with a temperature of 20±5℃ to reduce the change of the flow value caused by deformation wear and the like.

[0041] The two nozzles of the traceability standard determined in step five need to be regularly mutual calibrated, and when the mutual calibration result changes, steps two to five need to be repeated to revalue.

[0042] When the fuel sprayed by the nozzle is in a non-atomized state, a turbine flow meter is used for measurement.

[0043] Figure 2 The direct connection type pipeline flow connector 3 in the oil circuit connector 1 is connected with the fuel supply pipeline at the upper end, and is provided with an internal thread at the lower end, and can be connected with the nozzle.

[0044] The present application is a measurement method close to the true flow value, which is a measurement technology close to the true value under the current conditions.

Claims

1. A standard nozzle flow setting method for an aeroengine, characterized in that It comprises the following steps: Step one, adjust the environmental conditions to the laboratory measurement environment specified by the nozzle process; Step two, select three nozzles of the same process, select two nozzles, and use a straight pipe flow device to measure the flow of the two nozzles, and obtain the flow values of the corresponding nozzles a and b; Step three, use an oil circuit connector, which is a symmetrical U-shaped pipe connected to the oil supply pipe in the middle, and the two ends of the U-shaped pipe are provided with internal threaded holes, and the two nozzles measured are installed at the two ends of the oil circuit connector; Step four, install flow meters at the rear ends of the two nozzles, open the oil supply pipe to supply fuel, and after the fuel flow of the two nozzles installed in the oil circuit connector is stable, measure the flow of the two nozzles through the flow meters, and obtain the flow values of the corresponding nozzles a' and b' at this time; Step five, compare the values of a / b and a' / b', if they are not the same, repeat steps two to five; if they are the same, select the corresponding two nozzles as the traceable standard, and the flow values of the two nozzles are a and b, and the nozzle not measured is used as the working standard, and the next step is entered; Step six, select the nozzle with flow value a, install it and the nozzle as the working standard at the two ends of the oil circuit connector, and install flow meters at the rear ends of the two nozzles, open the oil supply pipe to supply fuel, and after the fuel flow of the two nozzles installed in the oil circuit connector is stable, measure the flow of the two nozzles through the flow meters, and obtain the flow values of the corresponding nozzles a'' and c' at this time; Step seven, calculate the flow of the nozzle as the working standard, the calculation method is as follows: The relative error δ of the nozzle with flow value a relative to the working standard nozzle is δ=(c'-a'') / a''; Then the flow c of the working standard nozzle is c=δ×a+a.

2. The standard nozzle flow setting method for an aero-engine as claimed in claim 1, wherein: Each of the two U-shaped pipes at the ends of the oil circuit connector is provided with a needle valve for adjusting the flow size.

3. The standard nozzle flow setting method for an aero-engine as recited in claim 1, wherein: The flow measurement in steps two, four and six uses an external direct measurement method.

4. The standard nozzle flow setting method for an aeroengine as recited in claim 1, wherein: The flow meter used in steps two, four and six for flow measurement is a mass flow meter.

5. The standard nozzle flow setting method for an aeroengine as recited in claim 1, wherein: The two nozzles of the traceable standard determined in step five are stored in a temperature environment with a temperature of 20±5℃ to reduce the change in flow value caused by deformation wear.

6. The standard nozzle flow setting method for an aero-engine as recited in claim 1, wherein: The two nozzles of the traceable standard determined in step five need to be regularly mutual calibrated, and when the mutual calibration result changes, steps two to five need to be repeated to revalue.

7. The standard nozzle flow setting method for an aero-engine as recited in claim 1, wherein: When the fuel sprayed by the nozzle is in a non-atomized state, a turbine flow meter is used for measurement.

8. The standard nozzle flow setting method for an aero-engine as claimed in claim 1, wherein: The straight pipe flow device is connected to the oil supply pipe at the upper end and is provided with an internal thread at the lower end, which can be connected to the nozzle.

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