Design and verification method of standard loading assembly for performance verification of test bench

Abstract

The invention discloses a design and verification method of a standard loading assembly for performance verification of a test bed, and relates to the technical field of aero-engine tests. According to the method, a standard loading assembly with fixed performance is designed through a pressure flow curve, so that the standard loading assembly becomes a solidified standard loading unit of the test bed, and the performance of the test bed can be quantitatively verified. The method has the advantages of being simple in structure, high in metering result reliability and high in metering result traceability, and can be used as a standard loading unit of the test bed to verify the performance of the test bed.

Description

Technical Field

[0001] The invention belongs to the technical field of aero-engine testing, and in particular relates to a design and verification method of a standard loading component used for testing bench performance verification. Background Art

[0002] Aircraft engine mechanical hydraulic products are an important part of aircraft engine control systems, and their performance indicators directly affect the performance of the entire engine. Experiments and tests run through the entire production cycle from components to installation, and the test bench measurement benchmarks used in each level of testing have an important impact on the performance indicator evaluation of the tested products. In the past, when conducting aircraft engine mechanical hydraulic product test bench calibration work, standard test pieces were generally used as the loading units of the test bench. However, the standard test piece is a complex system that integrates mechanical, electrical, and hydraulic systems. Daily maintenance is complex and the maintenance cost is high. In addition, due to the multi-system coupling of the standard test piece, its measurement results are difficult to return to the accurate definition of the physical quantity, the measurement results are of low accuracy, and it is difficult to maintain the stability of the performance of the calibrated test bench. Summary of the invention

[0003] Based on the above background, a standard loading component for test bench performance verification and its design and use method are provided, which is different from the previous test bench verification method based on standard test pieces, reduces the difficulty of test bench stability verification and the maintenance cost of the verification component.

[0004] In view of this, according to one aspect of an embodiment of the present invention, a design method of a standard loading component for test bench performance verification is provided, comprising:

[0005] Step S1: Determine the performance range of the calibrated test bench, including differential pressure and flow rate;

[0006] Step S2: establishing a target pressure difference flow curve a according to the pressure difference and the flow rate, designing the structure of the throttling element of the standard loading component according to the target pressure difference flow curve a, and determining the physical parameters of the throttling element;

[0007] Step S3: processing the throttling element of the designed standard loading assembly according to the physical parameters of the throttling element, and installing it on the target test bench for testing, determining whether the processed physical parameters are out of tolerance according to the test results, and drawing the test differential pressure flow curve b;

[0008] Step S4: Compare the pressure difference flow curve b drawn by the test results with the target pressure difference flow curve a. If the comparison result is within the tolerance range, the physical parameters of the component are used as self-calibration parameters, and the test data curve b is used as the target test bench standard calibration data.

[0009] Optionally, the physical parameters of the throttling element include at least one of the Reynolds number, flow coefficient, length, throttling section length, axial length of the expansion section, throttling hole design diameter, front straight section diameter, throttling hole leading edge diameter, throttling hole trailing edge diameter and rear straight section diameter.

[0010] Optionally, step S2 also includes: establishing a flow field model according to the physical parameters of the throttling element, setting the boundary conditions of the model according to the flow rate, pressure and physical parameters of the test medium during the actual operation of the calibrated test bench, and calculating through simulation whether the pressure difference flow performance of the designed throttling element is within the tolerance range of the target pressure difference flow performance curve a.

[0011] Optionally, step S2 further includes: if the pressure difference flow rate performance is within the tolerance range of the target pressure difference flow rate performance curve a, then executing step S3.

[0012] Optionally, step S2 further includes: if it is not within the range, redesigning the physical parameters of the throttling element.

[0013] Optionally, the tolerance range of the target pressure difference flow performance curve a is determined according to the test accuracy of the calibrated test bench and / or user requirements.

[0014] According to another aspect of an embodiment of the present invention, a calibration method for a standard loading assembly for test bench performance calibration is also provided, wherein any of the above methods is used to determine the target test bench standard calibration data and the physical parameters of the throttling element of the standard loading assembly, and further comprises:

[0015] Step S5: verifying the physical parameters of the standard loading component;

[0016] Step S6: If the physical parameter verification of the standard loading component passes, then install it on the verified test bench;

[0017] Step S7: Perform performance test on the calibrated test bench and draw a pressure difference flow curve c of the standard loading component according to the test results.

[0018] Step S8: Compare the pressure difference flow curve c drawn according to the test results with the pressure difference flow curve b of the target test bench standard verification data. If the comparison result passes, it can be determined that the test bench performance verification has passed.

[0019] Optionally, step S8 also includes: if the comparison result exceeds the tolerance range, it is determined that the test bench performance verification has failed.

[0020] The standard loading component and test bench verification method proposed in the present invention are different from the existing method of using the standard test piece as the loading unit. They can ensure the reliable performance of the standard loading unit through basic physical quantities, and determine the stability of the test bench through the performance curve of the standard loading component. In addition, the verification method relies on structurally solidified components, which is simple to maintain and has low manufacturing and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Design processes for standard loading components.

[0022] Figure 2 This is a standard loading component structure diagram.

[0023] Figure 3 Verification process for test bench based on standard loading components.

[0024] Description of reference numerals:

[0025] 1- outlet joint, 2- locking nut, 3- sealing element, 4- pressure measuring point, 5- throttling element, 6- inlet joint. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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 creative work are within the scope of protection of the present invention.

[0027] According to one aspect of an embodiment of the present invention, a design method of a standard loading assembly for test bench performance verification is provided, comprising:

[0028] Step S1: Determine the performance range of the calibrated test bench, including differential pressure and flow rate;

[0029] Step S2: Establish a target pressure difference flow curve a according to the pressure difference and flow rate, design the structure of the throttling element of the standard loading component according to the target pressure difference flow curve a, and determine the physical parameters of the throttling element; use the pressure difference and flow rate in the performance range of the calibrated test bench determined in step S1 as the horizontal and vertical coordinates in the coordinate system, respectively, to establish the target pressure difference flow curve a. Design the structure of the standard loading component according to the target pressure difference flow curve:

[0030] Step S3: processing the throttling element of the designed standard loading assembly according to the physical parameters of the throttling element, and installing it on the target test bench for testing, determining whether the processed physical parameters are out of tolerance according to the test results, and drawing the test differential pressure flow curve b;

[0031] Step S4: Compare the pressure difference flow curve b drawn by the test results with the target pressure difference flow curve a. If the comparison result is within the tolerance range, the physical parameters of the component are used as self-calibration parameters, and the test data curve b is used as the target test bench standard calibration data.

[0032] Furthermore, the physical parameters of the throttling element include at least one of the Reynolds number, flow coefficient, length, throttling section length, axial length of the expansion section, throttling hole design diameter, front straight section diameter, throttling hole leading edge diameter, throttling hole trailing edge diameter and rear straight section diameter.

[0033] Furthermore, step S2 also includes: establishing a flow field model according to the physical parameters of the throttling element, setting the boundary conditions of the model according to the flow rate, pressure and physical parameters of the test medium during the actual operation of the calibrated test bench, and calculating through simulation whether the pressure difference flow performance of the designed throttling element is within the tolerance range of the target pressure difference flow performance curve a.

[0034] Furthermore, step S2 also includes: if the pressure difference flow rate performance is within the tolerance range of the target pressure difference flow rate performance curve a, then executing step S3.

[0035] Furthermore, step S2 also includes: if it is not within the range, redesigning the physical parameters of the throttling element.

[0036] Furthermore, the tolerance range of the target pressure difference flow performance curve a is determined according to the test accuracy of the calibrated test bench and / or user requirements.

[0037] According to another aspect of an embodiment of the present invention, a calibration method for a standard loading assembly for test bench performance calibration is also provided, wherein any of the above methods is used to determine the target test bench standard calibration data and the physical parameters of the throttling element of the standard loading assembly, and further comprises:

[0038] Step S5: verifying the physical parameters of the standard loading component;

[0039] Step S6: If the physical parameter verification of the standard loading component passes, then install it on the verified test bench;

[0040] Step S7: Perform performance test on the calibrated test bench and draw a pressure difference flow curve c of the standard loading component according to the test results.

[0041] Step S8: Compare the pressure difference flow curve c drawn according to the test results with the pressure difference flow curve b of the target test bench standard verification data. If the comparison result passes, it can be determined that the test bench performance verification has passed.

[0042] Furthermore, step S8 also includes: if the comparison result exceeds the tolerance range, it is determined that the test bench performance verification has failed.

[0043] Example

[0044] like Figure 1-3 As shown in the figure, the marked parameter L1 of the throttling element 5 represents the length of the throttling element, L2 represents the length of the throttling section, L3 and L4 represent the axial length of the extension section, d represents the design diameter of the throttling hole, d1 represents the diameter of the front straight section, d2 represents the diameter of the front edge of the throttling hole, d3 represents the diameter of the rear edge of the throttling hole, and d4 represents the diameter of the rear straight section.

[0045] The number of standard loading components is determined according to the performance range of the test bench being calibrated. It can be 1 piece or 1 group. The components of each standard loading component cannot be mixed and must be stored separately.

[0046] The import and export of standard loading components must be clear and cannot be reversed.

[0047] In order to make the technical means, creative features, objectives and functions of the present invention clearer and easier to understand, the present invention is further explained below in conjunction with the accompanying drawings and specific implementation methods, wherein steps S1 to S4 are the standard loading component design process, and steps S5 to S8 are the test bench performance verification process.

[0048] S1: Determine the performance range of the test bench to be tested.

[0049] S2: The pressure difference and flow rate in the performance range of the calibrated test bench determined in step S1 are used as the horizontal and vertical coordinates in the coordinate system, respectively, to establish a target pressure difference and flow rate curve a. The standard loading component is structurally designed according to the target pressure difference and flow rate curve:

[0050] (1) The number of standard loading components is determined according to the performance range of the test bench to be calibrated and can be one piece or a group.

[0051] (2) Design the structure of the throttling element 5:

[0052] The Reynolds number must be designed before structural design. In formula (1), Re is the Reynolds number, ρ and μ are the density and kinematic viscosity of the test medium, and v and L represent the flow velocity and characteristic length of the component respectively. When Re < 2000, the fluid motion is in a laminar state. Based on this,

[0053]

[0054] Therefore

[0055]

[0056] Confirm attachment Figure 2When the length of the middle throttling section is greater than 4 times the aperture (L2 / d≥4), the flow rate can be calculated by the following formula:

[0057]

[0058] in:

[0059] Q——flow rate; ΔP——pressure difference; μ——liquid kinematic viscosity; ρ——liquid density; d——hole diameter; L2——hole length.

[0060] According to the flow velocity and characteristic length limiting conditions of formula (1) and formula (2) and the calculated d value, one or a group of d values ​​can be obtained, and the parameters L1, L2, L3, L4, d1, and d4 are set respectively, wherein L2 / L3 ≥ 6 is preferred, d1 and d4 should be consistent with the inner diameters of the inlet joint 1 and the outlet joint 6 respectively, L3 and L4 generally take the same value, L1 is the total length of the throttling element 5, which should meet the installation length requirement of the throttling locking nut, and L1 is greater than or equal to the sum of L2, L3 and L4;

[0061] (3) Determine the flow coefficient: flow coefficient C z It is usually related to the design, material and fluid properties of the throttling element. An approximate flow coefficient value can be determined through experimental data.

[0062] (4) According to the actual test medium flow rate of the test bench to be verified, the Reynolds number of the throttling element of the designed standard loading assembly is calculated according to formula (1) to ensure that the medium in this section is in a laminar flow state;

[0063] (5) Use CFD simulation software to establish a flow field model according to the physical parameters of the throttling element 5, set the boundary conditions of the model according to the flow rate, pressure and physical parameters of the test medium when the calibrated test bench is actually working, and calculate through simulation whether the pressure difference flow performance of the designed throttling element is within the tolerance range of the target pressure difference flow performance curve a. If it meets the design requirements, perform physical processing and execute step S3. If it does not meet the requirements, reset the values ​​of parameters L1, L2, L3, d1, and d4. Among them, the tolerance range of the target pressure difference flow performance curve a is determined according to the test accuracy of the calibrated test bench and user requirements.

[0064] S3: Obtain test data: Install the designed standard loading component on the target test bench for testing, determine whether its processed physical parameters are out of tolerance based on the test results, and draw the test pressure difference flow curve b.

[0065] S4: Verify the performance of the component: compare the test pressure difference flow curve b drawn by the test results with the designed pressure difference flow curve a. If the comparison result is within the tolerance range, it is considered that the physical parameters of the component can be solidified, and it is used as a special standard loading component for the target test bench for test bench calibration. Its physical parameters (including: component weight, d1, d4, L2, d2, d3 of the throttling element 5) are used as its own calibration parameters, and the test data curve b is used as the standard calibration data of the target test bench.

[0066] like Figure 3 As shown, S5: Verify the physical parameters of the standard loading component: The physical parameters of the standard loading component need to be verified each time the test bench is verified. The purpose is to avoid wear, blockage, deformation, etc. of the component during repeated use, which may affect its performance.

[0067] S6: If the physical parameter verification of the standard loading component passes, it is installed on the calibrated test bench.

[0068] S7: Perform performance assessment on the calibrated test bench and draw the pressure difference flow curve c of the standard loading component based on the test results.

[0069] S8: Compare the pressure differential flow curve c drawn according to the test results with the pressure differential flow curve b of the standard calibration data of the target test bench. If the comparison result passes, it can be determined that the performance calibration of the test bench has passed. If the comparison result exceeds the tolerance range, it is determined that the performance calibration of the test bench has failed.

[0070] The above is only a specific embodiment of the present invention, and the present invention is described in detail. The unexplained part is a conventional technology. However, the protection scope of the present invention is not limited to this. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. The protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A design method for a standard loading assembly for test bench performance verification, characterized in that: include: Step S1: Determine the performance range of the calibrated test bench, including differential pressure and flow rate; Step S2: establishing a target pressure difference flow curve a according to the pressure difference and the flow rate, designing the structure of the throttling element of the standard loading component according to the target pressure difference flow curve a, and determining the physical parameters of the throttling element; Step S3: processing the throttling element of the designed standard loading assembly according to the physical parameters of the throttling element, and installing it on the target test bench for testing, determining whether the processed physical parameters are out of tolerance according to the test results, and drawing the test differential pressure flow curve b; Step S4: Compare the pressure difference flow curve b drawn by the test results with the target pressure difference flow curve a. If the comparison result is within the tolerance range, the physical parameters of the component are used as self-calibration parameters, and the test data curve b is used as the target test bench standard calibration data.

2. The method according to claim 1, characterized in that The physical parameters of the throttling element include at least one of the Reynolds number, flow coefficient, length, throttling section length, axial length of the expansion section, throttling hole design diameter, front straight section diameter, throttling hole leading edge diameter, throttling hole trailing edge diameter and rear straight section diameter.

3. The method according to claim 1, characterized in that Step S2 also includes: establishing a flow field model according to the physical parameters of the throttling element, setting the boundary conditions of the model according to the flow rate, pressure and physical parameters of the test medium during the actual operation of the calibrated test bench, and calculating through simulation whether the pressure difference flow performance of the designed throttling element is within the tolerance range of the target pressure difference flow performance curve a.

4. The method according to claim 3, characterized in that: Step S2 also includes: if the pressure difference flow rate performance is within the tolerance range of the target pressure difference flow rate performance curve a, then executing step S3.

5. The method according to claim 3, characterized in that: Step S2 also includes: if it is not within the range, redesigning the physical parameters of the throttling element.

6. The method according to claim 3, characterized in that The tolerance range of the target pressure difference flow performance curve a is determined according to the test accuracy of the calibrated test bench and / or user requirements.

7. A method for verifying a standard loading assembly for test bench performance verification, characterized in that: Determining the target test bench standard calibration data and the physical parameters of the throttling element of the standard loading assembly using any of the methods described in claims 1-6, further comprising: Step S5: verifying the physical parameters of the standard loading component; Step S6: If the physical parameter verification of the standard loading component passes, then install it on the verified test bench; Step S7: Perform performance test on the calibrated test bench and draw a pressure difference flow curve c of the standard loading component according to the test results. Step S8: Compare the pressure difference flow curve c drawn according to the test results with the pressure difference flow curve b of the target test bench standard verification data. If the comparison result passes, it can be determined that the test bench performance verification has passed.

8. The method according to claim 7, characterized in that Step S8 also includes: if the comparison result exceeds the tolerance range, it is determined that the test bench performance verification has failed.

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