Method, device and computer-readable storage medium for selecting a damping network

Abstract

The present invention proposes a method, device and computer-readable storage medium for selecting a damping network. The method includes: selecting a target damping network based on a target gas temperature value and a target speed value, confirming whether the first pressure loss value obtained by the blow test calibration of the target damping network is consistent with the preset pressure value, if consistent, installing the target damping network in the engine, if inconsistent, re-executing the step of selecting the target damping network, verifying whether the gas temperature and speed of the target damping network in the engine reach 100% of the corresponding specified values ​​of the engine, if reaching 100% of the specified values, determining that the damping network is qualified, otherwise repeating the above steps until reaching 100% of the specified values ​​and stopping verification. Through the above method, the target damping network can be selected more quickly and simply, avoiding more load assembly and adjustment, and by verifying the target damping network, the qualified rate of the selected damping network can be improved, so that the selected damping network can indirectly improve the engine speed and gas temperature.

Description

Technical Field

[0001] The present invention belongs to the technical field of engines, and in particular relates to a method and device for selecting a damping network, and a computer-readable storage medium. Background Art

[0002] Currently, a 150-hour engine endurance test is a mandatory airworthiness requirement for every aircraft engine model. This airworthiness endurance test requires that engine power or thrust, gas temperature, and rotor shaft speed all reach 100% of the specified values ​​for the specific engine being tested. However, while achieving 100% of the specified values ​​for engine power or thrust is relatively easy, achieving both gas temperature and rotor shaft speed at the same time is more difficult, especially for multi-spool engines.

[0003] Existing testing methods for increasing engine gas temperature and rotor shaft speed primarily include increasing intake air temperature, bleed air, adjusting guide vane angle (vane area), retracting and extending nozzles, and anti-icing. However, these methods currently fail to meet the test requirement of simultaneously achieving 100% of the specified engine gas temperature and rotor shaft speed for all engines. Furthermore, adjusting the guide vane angle (vane area) on some engines requires reassembly, making adjustments complex and cumbersome. Summary of the Invention

[0004] In view of the above problems, the present invention proposes a method for selecting a damping network, which includes:

[0005] Select the target damping network according to the target gas temperature and speed;

[0006] Confirm whether the first pressure loss value obtained by the wind blowing test calibration of the target damping net is consistent with the preset pressure value;

[0007] If they are consistent, the target damping net is installed in the engine; if they are inconsistent, the step of selecting the target damping net is repeated;

[0008] Verify whether the gas temperature and speed of the target damping network in the engine reach 100% of the corresponding specified values ​​of the engine;

[0009] If it reaches 100% of the specified value, the damping network is determined to be qualified. Otherwise, repeat the above steps until it reaches 100% of the specified value and stop verification.

[0010] Optionally, the step of selecting a target damping network according to the target gas temperature value and the target speed value includes:

[0011] The target gas temperature value is obtained based on the difference between the gas temperature percentage of the engine performance test and the engine's corresponding specified 100%;

[0012] The speed target value is obtained according to the difference between the speed percentage of the engine performance test and the corresponding specified 100% of the engine.

[0013] Optionally, selecting a target damping network according to the target gas temperature value and the target speed value includes:

[0014] Obtaining an intake pressure loss value according to a relationship between the target gas temperature value and the target speed value;

[0015] Obtaining a pressure loss coefficient according to the intake pressure loss value;

[0016] Calculating the pressure loss coefficient of the required damping net according to the pressure loss coefficient and obtaining the mesh opening ratio of the damping net;

[0017] Calculate the mesh size and mesh wire diameter according to the mesh opening ratio;

[0018] The target damping net is obtained by selecting the mesh size and mesh wire diameter.

[0019] Optionally, before confirming whether the first pressure loss value obtained by the wind blowing test calibration of the target damping net is consistent with the preset pressure value, the method includes:

[0020] The first pressure loss value is obtained according to the conversion relationship between the target gas temperature value, the target speed value and the intake pressure loss.

[0021] Optionally, if the above conditions are consistent, installing the target damping net in the engine includes:

[0022] The air intake duct is modified according to the air intake duct structure of the engine to divide the air intake duct into two sections, and the target damping net is installed between the two sections of the air intake duct.

[0023] Optionally, the air intake duct is modified according to the structure of the engine air intake duct to divide the air intake duct into two sections, and the target damping net is installed between the two sections of the air intake duct, including:

[0024] Determining a location for installing the target damping net;

[0025] Determine the installation method of the target damping net according to its position;

[0026] The outer shape of the target damping net is modified according to the determined installation method so as to facilitate the cooperation with the air inlet when the target damping net is installed.

[0027] Optionally, determining the location for installing the target damping net includes:

[0028] If the air inlet is of regular shape, confirm the effects of gas temperature and speed, and determine the installation position of the target damping net according to the achieved effects;

[0029] Alternatively, if the air intake duct is irregular, the installation position of the target damping net is determined based on the difficulty of machining the air intake duct and whether it is convenient to install and remove the damping net.

[0030] Optionally, the verifying whether the gas temperature and the rotation speed of the target damping network in the engine reach 100% of the corresponding specified values ​​of the engine includes:

[0031] Confirm whether the engine gas temperature and speed have reached 100%;

[0032] If not, increase the engine's bleed air flow and inlet temperature, and reconfirm whether the engine's gas temperature and speed have reached 100%;

[0033] If not, the step of selecting the target damping network is executed again until the engine gas temperature and speed of the engine with the target damping network simultaneously reach 100% of the corresponding regulations of the engine, and the verification of the target damping network is stopped.

[0034] The present invention also provides a device for selecting a damping net, characterized in that it comprises:

[0035] A selection module is used to select a target damping network according to a target gas temperature value and a target speed value;

[0036] A confirmation module, configured to confirm whether a first pressure loss value obtained by the wind blowing test calibration of the target damping net is consistent with a preset pressure value;

[0037] An installation module is configured to install the target damping net in the engine if the two are consistent, and to re-execute the step of selecting the target damping net if the two are inconsistent;

[0038] A verification module, used to verify whether the gas temperature and speed of the target damping network in the engine reach 100% of the corresponding specified values ​​of the engine;

[0039] If it reaches 100% of the specified value, the damping network is determined to be qualified. Otherwise, repeat the above steps until it reaches 100% of the specified value and stop verification.

[0040] The present invention also provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and the computer program is used to execute the damping network selection method.

[0041] The damping network selection method of the present invention selects a target damping network according to a target gas temperature value and a target speed value, and verifies the target damping network finally selected, so as to determine whether the engine gas temperature and the speed reach 100% of the corresponding specified values ​​of the engine. Thus, the target damping network is selected more quickly and simply, avoiding more loaded assembly and adjustment. Moreover, by verifying the target damping network, the qualified rate of the selected damping network can be improved, so that the selected damping network can indirectly increase the engine speed and gas temperature.

[0042] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0044] Figure 1 A schematic diagram showing a method for selecting a damping network in an embodiment of the present invention is shown;

[0045] Figure 2 A schematic diagram of the installation position of the damping net in the method of selecting the damping net in an embodiment of the present invention is shown;

[0046] Figure 3 A schematic diagram of the flange edge of a method for selecting a damping net in an embodiment of the present invention is shown;

[0047] Figure 4 A schematic diagram of the damping net modification method of selecting the damping net in an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0048] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0049] like Figure 1 As shown, the present invention provides a method for selecting a damping network, the method comprising:

[0050] Step S10 selects a target damping network based on the target gas temperature and speed. Prior to this step, the target gas temperature and speed must be determined based on data obtained from the calibration engine, including fuel efficiency, temperature, and shaft speed. It should be noted that pre-test engine performance calibration is performed based on several engine data, and the target gas temperature and speed are determined by converting fuel efficiency, temperature, and speed.

[0051] In one embodiment, the step of selecting a target damping network according to the target gas temperature value and the target speed value includes:

[0052] The target gas temperature is determined based on the difference between the gas temperature percentage from the engine performance test and 100% of the engine's specified value. It should be noted that the target gas temperature to be increased is determined by the difference between the target gas temperature from the engine performance test and 100% of the engine's specified value, i.e., the difference ΔT.

[0053] The target speed value is determined based on the difference between the engine performance test speed percentage and the engine's corresponding specified value of 100%. It should be noted that the target speed to be increased is determined by the difference between the engine performance test speed percentage and the engine's corresponding specified value of 100%, i.e., the difference is ΔN.

[0054] Furthermore, the specific steps to determine the specifications and models of the damping net are as follows:

[0055] The target damping mesh is selected based on the target gas temperature and speed. The target damping includes the specification and model. It should be noted that damping meshes can have square or round holes, depending on the shape of the openings. They can also have plain or twill weaves, depending on the weave pattern. The performance of the damping mesh is determined by multiple parameters, including the number of damping mesh layers, loss coefficient, installation position, mesh diameter, and aperture ratio. The three most important parameters are: the number of damping mesh layers, the installation position, and the loss coefficient K of each damping mesh layer.

[0056] In one embodiment, selecting a target damping network according to a target gas temperature value and a target speed value includes:

[0057] The intake pressure loss value is derived from the relationship between the target gas temperature and the target speed. Specifically, the intake pressure loss value ΔP is calculated by converting the target gas temperature ΔT and the target speed ΔN, but the pressure loss must not cause engine surge. The calculation method for converting the target gas temperature ΔT and the target speed ΔN to obtain the intake pressure loss value ΔP varies depending on the engine type.

[0058] The pressure loss coefficient is obtained based on the intake pressure loss value. Specifically, the intake pressure loss value ΔP is used to obtain the pressure loss coefficient C P .

[0059] Right now

[0060] In formula (1), ρ is the air density (kg / m 3 ), ν is the incoming wind speed (m / s).

[0061] The pressure loss coefficient of the required damping network is calculated based on the pressure loss coefficient and the mesh opening ratio of the damping network is obtained. The specific algorithm is as follows:

[0062] C p =K Re {1.3×(1-β)+[(1-β) / β] 2}, formula (2)

[0063] In formula (2), β is the opening ratio of the grid, K Re is the influence coefficient of Reynolds number. When Reynolds number Re>400, the viscosity effect is small, and it is considered that K Re =1.0, the Reynolds number of air in this article is greater than 400.

[0064] The mesh size and mesh wire diameter are calculated based on the mesh opening ratio. The following algorithm can be obtained from the two formulas:

[0065]

[0066] β is the opening ratio, w is the basic size of the mesh, and d is the mesh wire diameter.

[0067] The target damping net is selected based on the mesh size and mesh wire diameter. It should be noted that, given the mesh size and mesh wire diameter, the mesh size and wire diameter that best meet the requirements can be selected based on the porosity in the preferred combination table of mesh size and wire diameter, thereby selecting the target damping net.

[0068] Step S20 confirms whether the first pressure loss value obtained from the wind test calibration of the target damping net is consistent with the preset pressure value. By confirming whether the wind test calibration results of the damping net meet the expected value, unqualified damping nets can be eliminated, improving the efficiency of damping net selection and facilitating subsequent installation and verification of the damping net.

[0069] In one embodiment, confirming whether a first pressure loss value obtained by a wind blowing test calibration of a target damping net is consistent with a preset pressure value includes:

[0070] The first pressure loss value is calculated based on the conversion relationship between the target gas temperature and speed values ​​and the intake pressure loss. By pre-determining whether the preset pressure value is equal to the intake pressure loss value, unqualified damping meshes can be eliminated in advance, avoiding wasted time and materials and improving work efficiency.

[0071] If the results are consistent, the target damping net is installed in the engine at step S30. If not, the target damping net selection step is repeated. It should be noted that even if the appropriate damping net is selected, if the installation location is not optimal, the final temperature and speed will not reach 100% of the engine's specified values. Therefore, the selection of the installation location is also very important.

[0072] In one embodiment, if the results are consistent, installing the target damping net in the engine includes:

[0073] The intake duct is modified according to the engine intake duct structure to divide the intake duct into two sections, and the target damping net is installed between the two sections. Generally, the intake duct is a one-piece structure. In order to install the damping net, the intake duct needs to be modified, that is, the intake duct is divided into two sections, and the damping net is added between the two ends. This installation method has a better effect.

[0074] In one embodiment, the air intake duct is modified according to the structure of the engine air intake duct to divide the air intake duct into two sections, and the target damping net is installed between the two sections of the air intake duct, including:

[0075] Determine the target damping net installation location. Consider whether the air intake duct has a regular shape and install it accordingly.

[0076] Determine the installation method according to the target damping net's location. The installation methods include flange (screw) connection, quick release ring (snap) connection, etc. Determine the installation method based on the difficulty of processing, installation and disassembly, cost and other factors. Figure 2 The characteristics of the air intake duct choose flange connection, that is, add flange edges on both sides of the segment, such as Figure 3 shown.

[0077] According to the determined installation method, the target damping net is modified in shape so as to facilitate the cooperation with the air inlet when the target damping net is installed. Figure 3 In this flange connection method, the damping net only needs to be cut into a slightly larger size according to the outer dimensions of the flange edge, and then processed according to the flange mounting holes. Figure 4 Finally, the segmented air intake duct and the modified damping net are connected together by screws for assembly.

[0078] In one embodiment, determining a location for installing the target damping net includes:

[0079] If the intake duct is of a regular shape, the effects of gas temperature and speed are confirmed, and the target damping net installation position is determined based on the achieved effects. That is, for a regular-shaped intake duct, the effects of gas temperature ΔT and speed ΔN are prioritized, and the damping net is installed at the intake duct location that provides the best results.

[0080] Or, if the intake duct is irregular, the target damping net installation position is determined based on the difficulty of processing the intake duct and whether it is convenient to install and remove the damping net. For irregular intake ducts, priority is given to the difficulty of processing, installation and removal. To determine the installation position of the damping net, multiple factors such as the effect of increased gas temperature ΔT and speed ΔN, processing difficulty, installation and removal should be considered comprehensively. For example, the intake duct of a certain engine (such as Figure 2 As shown in the figure, it is irregular, and the damping net is installed on the straight section, mainly considering the difficulty of processing and installation and disassembly.

[0081] Step S40 verifies whether the gas temperature and rotor shaft speed in the intake duct structure with the target damping net installed simultaneously reach 100% of the engine's corresponding specified values. If so, verification stops and the damping net is selected. Otherwise, the above steps are repeated until 100% of the specified values ​​are reached, at which point verification stops. By actually verifying whether the target damping net can simultaneously reach the target gas temperature and rotor shaft speed, the test difficulty of simultaneously reaching 100% of the engine's corresponding specified values ​​is resolved. This also provides a new method for simultaneously increasing engine speed and gas temperature testing, providing new insights for engines and significantly improving the level of engine testing technology.

[0082] In one embodiment, verifying whether the gas temperature and speed of the target damping network in the engine reach 100% of the corresponding specified values ​​of the engine includes:

[0083] Start the engine to slow speed and work for two to three minutes. Of course, before starting the engine to slow speed, you need to install the damping net in the intake duct.

[0084] Slowly increase the engine speed to maximum cruise or maximum continuous operation for four to six minutes. Warm the intake manifold and bleed air to the specified flow rate. Note whether the engine experiences surging or other abnormalities. If so, lower the engine speed, stop the engine, restart it, and repeat this process.

[0085] Slowly increase the engine power to its maximum rated power and check whether the target gas temperature and engine speed have reached 100%. If the gas temperature and speed do not reach the test target, adjust the bleed air flow and inlet temperature, and reconfirm whether the target gas temperature and engine speed have reached 100%. Note whether the engine surges or has other abnormalities. If abnormalities occur, lower the engine power, stop the engine, restart it, and repeat this process. In addition, adjust the bleed air flow to not exceed the maximum allowable bleed air volume of the engine, and the intake air heating temperature to not exceed the maximum heating temperature requirement.

[0086] If not, reselect the target damping network according to the performance verification test results and conduct the performance verification test until the target value of the engine gas temperature and the rotor shaft speed reach 100% of the corresponding specified value of the engine, and stop the selection and verification of the target damping network.

[0087] The present invention also provides a device for selecting a damping net, comprising:

[0088] A selection module is used to select a target damping network according to a target gas temperature value and a target speed value;

[0089] a calibration module, configured to confirm whether a first pressure loss value obtained by calibration of the target damping net through a wind blowing test is consistent with a preset pressure value;

[0090] Install the module, if they are consistent, install the target damping net in the engine, if they are inconsistent, repeat the step of selecting the target damping net;

[0091] Verification module, used to verify whether the gas temperature and rotor shaft speed of the engine with the target damping net installed reach 100% of the corresponding specified values ​​of the engine;

[0092] If it reaches 100% of the specified value, the damping network is determined to be qualified. Otherwise, repeat the above steps until it reaches 100% of the specified value and stop verification.

[0093] According to the above modules, the target damping network is selected and the final selected target damping network is verified. It can be determined whether the target value of the gas temperature and the speed of the rotor shaft reach 100% of the corresponding specified value of the engine at the same time. Therefore, the selected target damping network is faster and simpler, avoiding more loaded assembly and adjustment. In addition, the verified target damping network can improve the qualified rate of the selected damping network, so that the selected damping network can indirectly increase the engine speed and gas temperature.

[0094] The present invention also provides a computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program, and the computer program is used to execute any one of the damping network selection methods.

[0095] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for selecting a damping network, characterized in that: The method comprises: Select the target damping network according to the target gas temperature and speed; Confirm whether the first pressure loss value obtained by the wind blowing test calibration of the target damping net is consistent with the preset pressure value; If they are consistent, the target damping net is installed in the engine; if they are inconsistent, the step of selecting the target damping net is repeated; Verify whether the gas temperature and speed of the target damping network in the engine reach 100% of the corresponding specified values ​​of the engine; If it reaches 100% of the specified value, the damping network is determined to be qualified. Otherwise, repeat the above steps until it reaches 100% of the specified value and stop verification.

2. The method for selecting a damping network according to claim 1, characterized in that: The step of selecting a target damping network according to the target gas temperature and speed includes: The target gas temperature value is obtained based on the difference between the gas temperature percentage of the engine performance test and the engine's corresponding specified 100%; The speed target value is obtained according to the difference between the speed percentage of the engine performance test and the corresponding specified 100% of the engine.

3. The method for selecting a damping network according to claim 1, characterized in that: The selecting of a target damping network according to the target gas temperature value and the target speed value includes: Obtaining an intake pressure loss value according to a relationship between the target gas temperature value and the target speed value; Obtaining a pressure loss coefficient according to the intake pressure loss value; Calculating the pressure loss coefficient of the required damping net according to the pressure loss coefficient and obtaining the mesh opening ratio of the damping net; Calculate the mesh size and mesh wire diameter according to the mesh opening ratio; The target damping net is obtained by selecting the mesh size and mesh wire diameter.

4. The method for selecting a damping network according to claim 1, characterized in that: Before confirming whether the first pressure loss value obtained by the wind blowing test calibration of the target damping net is consistent with the preset pressure value, the method includes: The first pressure loss value is obtained according to the conversion relationship between the target gas temperature value, the target speed value and the intake pressure loss.

5. The method for selecting a damping network according to claim 1, characterized in that: If the above results are consistent, installing the target damping net in the engine includes: The air intake duct is modified according to the air intake duct structure of the engine to divide the air intake duct into two sections, and the target damping net is installed between the two sections of the air intake duct.

6. The method for selecting a damping network according to claim 5, characterized in that: The air intake duct is modified according to the structure of the engine air intake duct to divide the air intake duct into two sections, and the target damping net is installed between the two sections of the air intake duct, including: Determining a location for installing the target damping net; Determining the installation method of the target damping net according to its position; The outer shape of the target damping net is modified according to the determined installation method so as to facilitate the cooperation with the air inlet when the target damping net is installed.

7. The method for selecting a damping network according to claim 6, characterized in that: Determining the location for installing the target damping net includes: If the air inlet is of regular shape, confirm the effects of gas temperature and speed, and determine the installation position of the target damping net according to the achieved effects; Alternatively, if the air intake duct is irregular, the installation position of the target damping net is determined based on the difficulty of machining the air intake duct and whether it is convenient to install and remove the damping net.

8. The method for selecting a damping network according to claim 1, characterized in that: The verification of whether the gas temperature and the rotation speed of the target damping network in the engine reach 100% of the corresponding specified values ​​of the engine includes: Confirm whether the engine gas temperature and speed have reached 100%; If not, increase the engine bleed air flow and inlet temperature, and reconfirm whether the engine gas temperature and speed have reached 100%; If not, the step of selecting the target damping network is executed again until the engine gas temperature and speed of the engine with the target damping network simultaneously reach 100% of the corresponding regulations of the engine, and the verification of the target damping network is stopped.

9. A device for selecting a damping net, characterized in that: include: A selection module is used to select a target damping network according to a target gas temperature value and a target speed value; A confirmation module, configured to confirm whether a first pressure loss value obtained by the wind blowing test calibration of the target damping net is consistent with a preset pressure value; An installation module is configured to install the target damping net in the engine if the two are consistent, and to re-execute the step of selecting the target damping net if the two are inconsistent; A verification module, used to verify whether the gas temperature and speed of the target damping network in the engine reach 100% of the corresponding specified values ​​of the engine; If it reaches 100% of the specified value, the damping network is determined to be qualified. Otherwise, repeat the above steps until it reaches 100% of the specified value and stop verification.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and the computer program is used to execute the damping network selection method according to any one of claims 1 to 8.

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