Multi-layer sintering net test type selection method for hypersonic wind tunnel

Abstract

The invention belongs to the technical field of hypersonic wind tunnel tests, and discloses a multilayer sintering net test type selection method for a hypersonic wind tunnel. According to the multilayer sintering net test model selection method, a total pressure distribution uniformity measurement test, a sintering net pressure loss measurement test, a pulsating pressure measurement test and a wind tunnel flow field quality comprehensive performance evaluation test are carried out; and the pressure loss, the total pressure distribution uniformity, the airflow pulsation attenuation, the flow field quality comprehensive performance improvement degree and the like of the sintering net in the stable section are measured, the performance of the sintering net in the hypersonic speed wind tunnel can be truly simulated, and the mesh number and the thickness of the sintering net selected in the hypersonic speed wind tunnel construction or transformation are finally determined according to the test evaluation result. Data obtained by the test is used as a wind tunnel operation parameter setting basis and a wind tunnel flow field quality performance technical index, and a test result of model selection evaluation can be applied to hypersonic wind tunnels with different calibers for model selection.

Description

technical field [0001] The invention belongs to the technical field of hypersonic wind tunnel tests, and in particular relates to a method for selecting a multi-layer sintered mesh for hypersonic wind tunnel tests. Background technique [0002] The hypersonic wind tunnel test is one of the main means to obtain the aerodynamic performance of the aircraft. The data obtained from the hypersonic wind tunnel test will be directly applied to the aircraft design, so the accuracy and data quality of the test data are particularly important in the entire aircraft development process. The inhomogeneity and unsteady flow of the hypersonic wind tunnel flow field have a great impact on the accuracy of the aircraft test data. Therefore, from the perspective of improving the accuracy of wind tunnel test data, the hypersonic wind tunnel needs to have the best possible flow field quality. [0003] The sintered mesh is made of multi-layer metal woven wire mesh, which is manufactured by lami...

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Problems solved by technology

[0004] However, the effects of pressure loss, total pressure distribution uniformity, noise reduction and air pulsation reduction are quite different for sintered meshes with different meshes and different thicknesses under different Mach numbers or different air flow velocities.

The airflow pressure in the stable section of the hypersonic wind tunnel can reach up to 12 MPa, and the airflow velocity can reach up to 40 m / s. The manufacturer of the sintered mesh only uses the bubble pressure test to test the air permeability of the sintered mesh, which cannot simulate the stable section of the hypersonic wind tunnel. For low-speed wind tunnels and transonic wind tunnels, the pressure loss of sintered mesh cannot be extended to hypersonic wind tunnels because of the low test air velocity, so it can be used as a hypersonic wind tunnel As a reference, for sintered mesh with a thickness of 120 mesh and 5 mm, the pressure loss measured by the low-speed wind tunnel and the transonic wind tunnel is less than 10%, while the pressure loss measured by the hypersonic wind tunnel is close to 60%.

At present, there is no pressure loss of high-speed and high-pressure airflow passing through the sintered mesh when the sintered mesh is running in a hypersonic wind tunnel, the uniformity of pressure distribution after the airflow passes through the sintered mesh, the noise reduction effect, and the degree of improvement of the comprehensive performance of the hypersonic wind tunnel flow field. the relative impact of

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