Calculation method and device for flow field turbulence in supersonic and hypersonic wind tunnels

Abstract

Embodiments of the invention disclose a supersonic velocity and hypersonic velocity wind tunnel flow field turbulence degree calculation method and device; the method comprises the following steps ofacquiring original total pressure data after wind tunnel flow field shock waves, and decomposing the original total pressure data at each moment into pulsation-free wave-back total pressure data and actual wave-back total pressure pulsation data; according to a pre-obtained pressure pulsation conversion coefficient corresponding to the wind tunnel flow field and the actual wave-back total pressurepulsation data at each moment, calculating actual wave-front static pressure pulsation data corresponding to each actual wave-back total pressure pulsation data separately; dividing the actual wave-back total pressure pulsation data into a plurality of data segments according to the characteristic time; and calculating the average value of the wave-front static pressure of the wind tunnel flow field in the preset time period according to the average value of the pulsation-free wave-back total pressure data according to a first preset formula, and calculating the turbulence degree corresponding to each data segment according to the average value of the wave-front static pressure and the actual wave-front static pressure pulsation data according to a second preset formula. According to themethod, the calculation precision of the turbulence degree can be improved.

Description

technical field [0001] The invention relates to the technical field of wind tunnel flow field, in particular to a method and device for calculating the turbulence degree of supersonic and hypersonic wind tunnel flow field. Background technique [0002] The wind tunnel is the main equipment for aircraft and other ground simulation experiments. The aerodynamic data of the aircraft model obtained in the wind tunnel is the basis and basis for aircraft design and future flight tests. The degree of wind tunnel turbulence is a standard to measure the fluctuating degree of airflow velocity in the experimental section of the wind tunnel. In supersonic or hypersonic wind tunnels, hot wire measurements are relatively difficult, and the measurement result is the pulsation of the flow, resulting in an inaccurate assessment of the degree of turbulence. In recent years, in the development of hypersonic vehicles, it has been found that many flight tests have failed due to the flight tests ...

AI Technical Summary

Problems solved by technology

In supersonic or hypersonic wind tunnels, hot wire measurements are relatively difficult, and the result of the measurement is the pulsation of the flow, resulting in an inaccurate assessment of the degree of turbulence

In recent years, in the development of hypersonic vehicles, it has been found that many flight tests have failed due to the flight tests carried out based on the results of ground supersonic / hypersonic wind tunnel experiments

The reason is that the turbulence of the supersonic / hypersonic wind tunnel flow field is usually 1-2 orders of magnitude higher than the turbulence of the incoming flow in the real flight environment of the aircraft, resulting in a large difference between the ground wind tunnel experiment and the real flight experiment

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