Ramjet Radial Intake Distortion Suppression Grille and Its Design Method

Abstract

The invention provides a radial air inlet distortion restraining grating of a ramjet engine and a designing method of the radial air inlet distortion restraining grating, and relates to a ramjet engine. The radial air inlet distortion restraining grating of the ramjet engine is provided with a first distortion restraining grating plate and a second distortion restraining grating plate which are stacked together coaxially, wherein the first distortion restraining grating plate consists of flexible spiral plates which surround a center drum; the second distortion restraining grating plate consists of radial scrolls of which the number is fixed; the geometric position of the second distortion restraining grating plate is fixed relative to the ramjet engine; and the first distortion restraining grating plate and the second distortion restraining grating plate are arranged on an inlet of a circular combustion chamber of the ramjet engine. The designing method of the radial air inlet distortion restraining grating comprises the following steps of determining a maximum radial distortion value DIS_R according to incoming flow conditions of different aircrafts; determining the minimum area ARmin of a ring for restraining the maximum radial distortion value DIS_R; determining the number of turns of the spiral plates of the first distortion restraining grating plate; and determining the number of the radial scrolls of the second distortion restraining grating plate. The number of the turns of the spiral plates is equal to the quotient of the area of the circle of the inlet of the circular combustion chamber and the ARmin, and the number of the radial scrolls is three times greater than that of the spiral plates of the first distortion restraining grating plate.

Description

technical field [0001] The invention relates to a ramjet engine, in particular to a ramjet engine radial 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 ensure the uni...

AI Technical Summary

Problems solved by technology

However, the current air intake grille design scheme basically adopts a single-form, fixed-geometric 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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