Method for open-air performance test of aircraft engine using turbulence control panel

Abstract

The present application relates to a method for conducting an open-air performance test of an entire aircraft engine using a turbulence control screen, comprising installing the aircraft engine on a test bench, measuring and calibrating the position of the axis of the aircraft engine and its air inlet; adjusting the height and orientation of a honeycomb ball so that a circular cutout on the honeycomb ball is horizontally aligned with the air inlet of the aircraft engine, and extending the air inlet duct of the aircraft engine into the honeycomb ball through the center of an air inlet canvas; jointly debugging the aircraft engine and the turbulence control screen; measuring the pressure loss caused by the turbulence control screen on the air inlet of the aircraft engine and the uniformity of the air inlet of the aircraft engine, adjusting the distance L from the center of the honeycomb ball to the air inlet of the aircraft engine, repeatedly measuring the pressure loss caused by the turbulence control screen on the air inlet of the aircraft engine and the uniformity of the air inlet of the aircraft engine, and finding an L at which the pressure loss caused by the turbulence control screen on the air inlet of the aircraft engine is smaller and the air inlet uniformity of the aircraft engine is better; and conducting an open-air performance test of the entire aircraft engine.

Description

Technical Field

[0001] The present application belongs to the technical field of open-air performance testing of complete aircraft engines, and specifically relates to a method for conducting open-air performance testing of complete aircraft engines using a turbulence control screen. Background Art

[0002] In open-air performance tests of aircraft engines, especially those of high bypass ratio turbofan engines, the intake airflow is easily affected by the ambient wind and its ground effect, and there is greater turbulence and fluctuations, which deviate greatly from the actual intake conditions of the aircraft engine when working in the air. This causes large swings in the test data, makes it difficult to process, and results in large uncertainty in the calculation results. The accuracy and reliability of the test results are poor, making it difficult to evaluate the true performance of the aircraft engine. The window period is required to wait until a completely windless environment occurs, which will affect the test cycle.

[0003] In order to reduce the impact of turbulence during the open-air performance test of the entire aircraft engine, a turbulence control screen is designed, such as Figure 1 As shown, it includes a honeycomb ball 1, an air intake canvas 2, a mobile bracket 3, and a jack 4, wherein the honeycomb ball 1 is formed by splicing a plurality of plane honeycombs and has a rearward circular cutout; the air intake canvas 2 is annular, and the outer edge is connected to the edge of the circular cutout; the mobile bracket 3 is supported at the bottom of the honeycomb ball 1, and rollers are installed at the bottom so that it can move; there are four jacks 4 connected to the bottom of the mobile bracket 3, which can adjust the overall height of the mobile bracket 3 and its honeycomb ball 1 and the air intake canvas 2. However, at present, the turbulence control screen is mainly used to reduce the intake turbulence during the noise measurement test of the aircraft engine to reduce external interference, but there is a lack of specific use methods for the performance-related tests of large bypass ratio aircraft engines on the open-air test bench. In view of this, the present application is proposed.

[0004] It should be noted that the disclosure of the above background technology content is only used to assist in understanding the inventive concept and technical solution of the present invention, and it does not necessarily belong to the prior art of the present application. In the absence of clear evidence that the above content has been disclosed on the filing date of the present application, the above background technology should not be used to evaluate the novelty and creativity of the present application. Summary of the invention

[0005] The purpose of this application is to provide a method for conducting open-air performance tests on aircraft engines as a whole using a turbulence control screen. The method uses a turbulence control screen to conduct open-air performance tests on aircraft engines as a whole, and performs detailed design to effectively reduce the turbulence level of the aircraft engine intake, reduce pressure loss and its unevenness, and improve the accuracy and reliability of the test results.

[0006] To overcome or alleviate at least one of the known technical deficiencies.

[0007] The technical solution of this application is:

[0008] A method for conducting an open-air performance test of an aircraft engine using a turbulence control screen, comprising:

[0009] Install the aircraft engine on the test bench and measure and calibrate the position of the aircraft engine axis and its air inlet;

[0010] Adjust the height and orientation of the honeycomb ball so that the circular cutout on the honeycomb ball is aligned horizontally with the air intake of the aircraft engine, and extend the air intake of the aircraft engine into the honeycomb ball through the center of the air intake canvas;

[0011] Conduct joint debugging of aircraft engines and turbulence control panels to check whether there are any abnormalities in aircraft engines and turbulence control panels;

[0012] Measure the pressure loss caused by the turbulence control screen on the aircraft engine intake and the uniformity of the aircraft engine intake, adjust the distance L from the center of the honeycomb ball to the aircraft engine intake, repeatedly measure the pressure loss caused by the turbulence control screen on the aircraft engine intake and the uniformity of the aircraft engine intake, and find the L that makes the pressure loss caused by the turbulence control screen on the aircraft engine intake smaller and the aircraft engine intake uniformity better;

[0013] Conduct open-air performance tests on complete aircraft engines.

[0014] According to at least one embodiment of the present application, in the above-mentioned method of conducting open-air performance tests on aircraft engines using turbulence control screens, when conducting open-air performance tests on aircraft engines, ensure that the ambient wind speed is no more than 6 m / s and the ambient humidity is less than 70%.

[0015] According to at least one embodiment of the present application, in the above-mentioned method of conducting open-air performance tests of aircraft engines as a whole using a turbulence control screen, when conducting open-air performance tests of aircraft engines as a whole, when the diameter of the honeycomb sphere is 2.5 to 3.5 times the diameter of the aircraft engine air inlet and the diameter of the circular cutout on the honeycomb sphere is 0.5 to 0.7 times its diameter, the L corresponding to the cone angle of 115° to 120° between the center of the aircraft engine air inlet and the circular cutout of the honeycomb sphere is selected. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the turbulence control screen for the open-air performance test of the existing aircraft engine;

[0017] Figure 2 It is a schematic diagram of a method for conducting an open-air performance test of an aircraft engine using a turbulence control screen provided in an embodiment of the present application;

[0018] Figure 3A schematic diagram showing a comparison between a method for conducting an open-air performance test of an aircraft engine using a turbulence control screen provided in an embodiment of the present application and a conventional method, and measuring a certain test data of the aircraft engine;

[0019] in:

[0020] 1-honeycomb ball; 2-air intake canvas; 3-mobile bracket; 4-jack; 5-aircraft engine; 6-test bench.

[0021] In order to better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. In addition, the drawings are only used for illustrative purposes and should not be construed as limitations on the present application. DETAILED DESCRIPTION

[0022] In order to make the technical solution and advantages of the present application clearer, the technical solution of the present application will be further described in detail in detail and in detail in conjunction with the accompanying drawings. It can be understood that the specific embodiments described here are only partial embodiments of the present application, which are only used to explain the present application, not to limit the present application. It should be noted that, for the convenience of description, only the parts related to the present application are shown in the accompanying drawings, and other related parts can refer to the general design. In the absence of conflict, the embodiments in the present application and the technical features in the embodiments can be combined with each other to obtain new embodiments.

[0023] In addition, unless otherwise defined, the technical terms or scientific terms used in the description of this application shall be the common meanings understood by the general technicians in the field to which this application belongs. The words "upper", "lower", "left", "right", "center", "vertical", "horizontal", "inside", "outside" and other words indicating orientation used in the description of this application are only used to indicate the relative direction or positional relationship, and do not imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. When the absolute position of the described object changes, its relative positional relationship may also change accordingly, so it cannot be understood as a limitation on this application. The "first", "second", "third" and similar terms used in the description of this application are only used for descriptive purposes to distinguish different components, and cannot be understood as indicating or implying relative importance. The similar words "one", "one" or "the" used in the description of this application should not be understood as an absolute limitation on quantity, but should be understood as the existence of at least one. The similar words "including" or "comprising" used in the description of this application mean that the elements or objects appearing in front of the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0024] In addition, it should be noted that, unless otherwise clearly specified and limited, the words "installed", "connected", "connected" and similar terms used in the description of this application should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. Technical personnel in the field can understand their specific meanings in this application according to the specific circumstances.

[0025] The following is combined with Figures 1 to 3 The method provided in the present application for conducting open-air performance tests on complete aircraft engines using turbulence control screens is further described in detail.

[0026] Step 1: Install the aircraft engine 5 on the test bench 6, and measure and calibrate the position of the aircraft engine axis and its air inlet.

[0027] Step 2: adjust the height and orientation of the honeycomb ball 1 so that the circular cutout on the honeycomb ball 1 is horizontally aligned with the air inlet of the aircraft engine 5, the center of the honeycomb ball 1 is on the axis of the aircraft engine 5, and the air inlet duct of the aircraft engine 5 is extended into the honeycomb ball 1 through the center of the air inlet canvas 2. The air inlet canvas 2 is sealed between the honeycomb ball 1 and the air inlet duct of the aircraft engine 5.

[0028] Step 3: Perform joint debugging on the aircraft engine and turbulence control screen to check whether there are any abnormalities in the aircraft engine and turbulence control screen, such as whether there is severe vibration or damage. If there is any abnormality, the cause should be analyzed and corresponding improvements should be made.

[0029] Step 4: Measure the pressure loss caused by the turbulence control screen on the intake of the aircraft engine 5 and the uniformity of the intake of the aircraft engine 5. Specifically, the detection can be carried out by setting corresponding temperature, pressure and other measuring points on the periphery of the aircraft engine 5 and the air inlet.

[0030] The distance L from the center of the honeycomb sphere 1 to the air inlet of the aircraft engine 5 is adjusted, and the pressure loss caused by the turbulence control screen to the air inlet of the aircraft engine 5 and the uniformity of the air inlet of the aircraft engine 5 are repeatedly measured, and the L at which the pressure loss caused by the turbulence control screen to the air inlet of the aircraft engine 5 is smaller and the air inlet uniformity of the aircraft engine 5 is better is found, which is used as the distance from the center of the honeycomb sphere 1 to the air inlet of the aircraft engine 5 during the test.

[0031] Step 5: Conduct an open-air performance test of the entire aircraft engine. Use the flat honeycombs on the honeycomb ball 1 to break up the vortex in the intake air and perform rectification to reduce the turbulence of the aircraft engine intake air. The intake canvas 2 acts as a seal between the honeycomb ball 1 and the aircraft engine intake duct, which can reduce the leakage of the aircraft engine intake air. There is no constraint relationship between the intake canvas 2 and the aircraft engine intake duct.

[0032] In the method of using a turbulence control screen to conduct open-air performance tests on an entire aircraft engine as disclosed in the above embodiment, when conducting the test, it is necessary to ensure that the ambient wind speed is no more than 6 m / s and the ambient humidity is less than 70%. The test can be performed by setting corresponding temperature, pressure and other measuring points in the far field.

[0033] The study found that when the diameter of the honeycomb sphere 1 is 2.5 to 3.5 times the diameter of the air inlet of the aircraft engine 5 and the diameter of the circular cutout on the honeycomb sphere 1 is 0.5 to 0.7 times its diameter, the L corresponding to the cone angle between the center of the air inlet of the aircraft engine 5 and the circular cutout of the honeycomb sphere 1 is about 115° to 125°, which can reduce the pressure loss caused by the turbulence control screen on the air inlet of the aircraft engine 5 and make the air inlet of the aircraft engine 5 more uniform, meeting the test needs. When conducting the test, the L corresponding to the cone angle of 120° between the center of the air inlet of the aircraft engine 5 and the circular cutout of the honeycomb sphere 1 can be selected.

[0034] In a specific embodiment, the method for conducting an open-air performance test of an aircraft engine using a turbulence control screen provided by the present application is used to conduct a test, and a comparison of a certain test data of the aircraft engine is measured by a conventional method. Figure 3 As shown, it can be seen that the method of conducting open-air performance tests on aircraft engines using a turbulence control screen provided by the present application can significantly reduce the vibration of the test data and ensure the accuracy and reliability of the test results.

[0035] So far, the technical solution of the present application has been described in conjunction with the preferred embodiments shown in the accompanying drawings. Those skilled in the art should understand that the scope of protection of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the scope of protection of the present application.

Claims

1. A method for conducting an open-air performance test of an aircraft engine using a turbulence control screen, characterized in that: include: Installing an aircraft engine (5) on a test bench (6) and measuring and calibrating the position of the aircraft engine axis and its air inlet; The height and orientation of the honeycomb ball (1) are adjusted so that the circular cutout on the honeycomb ball (1) is aligned horizontally with the air inlet of the aircraft engine (5), and the air inlet of the aircraft engine (5) is extended into the honeycomb ball (1) through the center of the air inlet canvas (2); Conduct joint debugging of aircraft engines and turbulence control panels to check whether there are any abnormalities in aircraft engines and turbulence control panels; The pressure loss caused by the turbulence control screen on the air intake of the aircraft engine (5) and the uniformity of the air intake of the aircraft engine (5) are measured, and the distance L from the center of the honeycomb ball (1) to the air intake of the aircraft engine (5) is adjusted, and the pressure loss caused by the turbulence control screen on the air intake of the aircraft engine (5) and the uniformity of the air intake of the aircraft engine (5) are repeatedly measured, and the L at which the pressure loss caused by the turbulence control screen on the air intake of the aircraft engine (5) is small and the air intake uniformity of the aircraft engine (5) is better is found; Conduct open-air performance tests on complete aircraft engines.

2. The method for conducting an open-air performance test of an aircraft engine using a turbulence control screen according to claim 1, characterized in that: When conducting open-air performance tests on complete aircraft engines, ensure that the ambient wind speed is no more than 6m / s and the ambient humidity is less than 70%.

3. The method for conducting open-air performance test of an aircraft engine using a turbulence control screen according to claim 1, characterized in that: When conducting an open-air performance test of an entire aircraft engine, when the diameter of the honeycomb ball (1) is 2.5 to 3.5 times the diameter of the air inlet of the aircraft engine (5) and the diameter of the circular cutout on the honeycomb ball (1) is 0.5 to 0.7 times the diameter of the air inlet of the aircraft engine (5), L corresponding to the cone angle between the center of the air inlet of the aircraft engine (5) and the circular cutout of the honeycomb ball (1) is 115° to 120° is selected.

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