Circumferential intake distortion suppression grille for ramjet engine and its design method

Abstract

The invention discloses a ramjet circumferential air inlet distortion restraint grating and a design method thereof, relating to ramjets. The ramjet peripheral air inlet distortion restraint grating is provided with three distortion restraint grating pieces which are sequentially sleeved and laminated together in series, wherein the three distortion restraint grating pieces consist of concentric circular rings and radial banners with consistent distribution rules; the position of the first grating piece is immovable relative to the ramjet; the second grating piece and the third grating piece can rotate around a shaft which is concentric to the first grating piece; the second grating piece and the third grating piece are connected with the first grating piece by virtue of a sleeve shaft to serve as a whole so as to be arranged at the inlet of a circular section of the ramjet combustion chamber; and the second grating piece and the third grating piece are respectively controlled to rotate by virtue of an independent servo rotating motor. The design method comprises the following steps: determining the maximum circumferential distortion value DC (60); determining the minimum grating sector angle thetamin needed for restraining the maximum circumferential distortion value DC (60); determining the grating sector angles; determining the number of radial banners of the gratings; and determining the number of concentric circular rings of the gratings.

Description

technical field [0001] The invention relates to a ramjet engine, in particular to a ramjet engine circumferential intake distortion suppressing grille and a design method thereof. Background technique [0002] The ramjet is an air-breathing high-speed propulsion power device, which is widely used in high-speed aircraft such as supersonic cruise missiles and supersonic aircraft to provide jet propulsion power for them. A conventional ramjet engine consists of three major components, namely the diffuser, the combustion chamber and the tailpipe. The high-speed airflow first enters the diffuser to decelerate and diffuse, and the speed drops from supersonic to subsonic, then ignites and burns in the combustion chamber, and finally ejects from the tail nozzle to generate thrust. [0003] From the perspective of ramjet engine components, the airflow at the outlet of the diffuser will enter the combustion chamber to ignite and burn. In the real environment, it is difficult to ensur...

AI Technical Summary

Problems solved by technology

However, the current air intake grille design scheme basically adopts a single-form, geometrically fixed grille, and the small hole shape, aperture size, and clogging degree of the grille remain unchanged under different engine operating conditions

It is difficult for a distortion suppression grille with a fixed geometry to obtain a good airflow distortion suppression effect under all engine operating conditions while maintaining the minimum internal aerodynamic resistance of the engine

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