A Pressure Backpropagation Suppression Structure for Pulse Detonation Engines

Abstract

The invention provides a pulsed detonation engine pressure back-propagation suppression structure comprising a loop sleeve and a multi-stage pressure attenuation device; the multi-stage pressure attenuation device comprises a front end attenuator and a back end attenuator, and the middle stage number is adjustable to form a multi-stage adjustable structure; an attenuator reduces back-propagation pressure by expanding a channel; the loop sleeve is used to connect and fix the attenuator; the loop sleeve also forms a resonant cavity and an external flow channel with the attenuator; and incoming flow is divided into the inner and the outer parts through an air-dividing cap, and the resonant cavity communicates with outer air flow through an air inlet groove and communicates with an inner flowchannel of the attenuator through dilute wave holes. According to the pulsed detonation engine pressure back-propagation suppression structure, a plurality of back-propagation pressure decay methods are formed by the ingenious combination of structures; the current back-propagation suppression theory is comprehensively operated, such as bluff body reflection, expansion channel decompression, resonant cavity dissipation, and the like; and the attenuation distance of the back-propagation pressure is short, the attenuation effect of the back-propagation pressure is good, the back-propagation pressure and back-flow gas of a detonation tube can be reliably suppressed, and the good application effect based on a certain incoming flow pressure head is possessed.

Description

technical field [0001] The invention belongs to the field of pulse detonation engines, and relates to a structure for suppressing pressure reverse transmission of pulse detonation engines. Background technique [0002] A pulse detonation engine (Pulse Detonation Engine, PDE for short) is a pulse jet engine that uses periodic detonation waves to generate thrust. The thermodynamic process of pulse detonation engine is similar to constant volume cycle, so it has high thermal efficiency. The advantage of the pulse detonation engine is that the combustion process is rapid and the energy density is high. Due to its broad application prospects and excellent potential performance, it has attracted many scholars at home and abroad to study and discuss. Pulse detonation engines are divided into air-breathing pulse detonation engine (APDE for short) and pulse detonation rocket engine (Pulse Detonation Rocket Engine, PDRE for short) according to the source of oxidant. Among them, the...

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Problems solved by technology

However, in the working environment of high temperature, high pressure and high frequency, mechanical valves are prone to mechanical fatigue, resulting in damage to the valve, and reliability is not guaranteed; at the same time, the response speed of the mechanical valve also greatly limits the increase in operating frequency

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