Noise reduction method for weapon cabin of supersonic aircraft on basis of turbulent flow on front-edge surface

Abstract

A noise reduction method for a weapon cabin of a supersonic aircraft on the basis of turbulent flow on a front-edge surface includes steps of (1), acquiring the flight speed, the incoming flow density, the incoming flow temperature, an incoming flow viscosity coefficient and the thickness of a boundary layer of the front-edge surface of the weapon cabin according to the flight condition of the supersonic aircraft, and computing an incoming Reynolds number on the basis of the thickness of the boundary layer of the front-edge surface of the weapon cabin; (2), selecting a fundamental-frequency disturbance sheet; (3), computing the ratio of the length to the depth of the supersonic aircraft according to the length, the depth and the width of the weapon cabin of the supersonic aircraft, reducing the thickness H of the fundamental-frequency disturbance sheet by 10-20% if the ratio is larger than 4, or increasing the thickness H of the fundamental-frequency disturbance sheet by 10-20% if the ratio is not larger than 4; and (4), fixing the fundamental-frequency disturbance sheet on the supersonic aircraft to complete noise reduction for the weapon cabin of the supersonic aircraft on the basis of the turbulent flow on the front-edge surface. The noise reduction method has the advantage that the problem of severe self-sustained oscillation of pressure of the inside of the cabin after the buried weapon cabin is opened during supersonic flight of the supersonic aircraft can be effectively solved.

Description

technical field [0001] The invention relates to a noise reduction method for a weapon compartment of a supersonic aircraft based on turbulence on the surface of the leading edge, which is used for reducing severe noise and self-sustaining pressure oscillation in the weapon compartment when the aircraft with a built-in weapon compartment flies at supersonic speed. Background technique [0002] Weapon embedding is an inevitable development trend of supersonic vehicle weapon carrying methods. figure 1 It is a schematic diagram of the fighter's internal weapon bay and weapon mounts. The figure describes the structural composition of the weapon bay when the door is opened. When the aircraft is flying at supersonic speed, after opening the weapon compartment, as indicated figure 2 (a), the high-speed airflow flows over the surface of the weapon compartment and mixes with the air in the compartment to form a shear layer, and the shear layer vortices interact with the rear edge of...

AI Technical Summary

Problems solved by technology

[0003] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art, to provide a noise reduction method for the weapon compartment of a supersonic aircraft based on the turbulence of the leading edge surface, and to solve the problem of opening the rear compartment of the buried weapon compartment when the supersonic aircraft is flying at supersonic speed The problem of severe self-sustained oscillation of internal pressure

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