Combined pulse detonation engine detonation chamber

Abstract

The invention discloses a combined pulse detonation engine detonation chamber. An ignition combination mode of a two-stage shock wave focusing device and pre-detonation pipes is adopted. A main detonation chamber is connected with an engine, and a first pre-detonation pipe and a second pre-detonation pip are fixed on two sides of the engine, and are mounted parallelly to the main detonation chamber through a first jet pipe and a second jet pipe respectively. Detonation jet led out from pre-detonation pipe outlets by the jet pipes firstly fills the main detonation chamber and a shock wave focusing cavity via an intensively-mixed and atomized gas-oil mixture, after filling, the detonation jet led out from the pre-detonation pipes enters the detonation chamber from outlets of the jet pipes to ignite the oil-gas mixture in the detonation chamber, and deflagration waves with leading shock waves are formed to be propagated forwards. The deflagration waves form strong shock waves under the action of a flow guide ring, and the strong shock waves ignite an explosible oil-gas mixture to form detonation waves and generate high positive thrust. Initiation of explosion of the pulse detonation engine detonation chamber within a short distance is realized, so that the engine is shortened, and working frequency of the pulse detonation engine is increased.

Description

technical field [0001] The invention belongs to the technical field of detonation engines, and in particular relates to a combined pulse detonation engine detonation chamber. Background technique [0002] Propulsion systems using detonation waves to generate thrust include oblique detonation engines, rotary detonation engines, pulse detonation engines, two-stage pulse detonation engines, and the like. A pulse detonation engine is a propulsion system that uses periodic detonation waves to generate thrust. A general pulse detonation engine produces a slow combustion wave through spark plug ignition. After the slow combustion wave accelerates through obstacles, it forms a local hot spot, that is, the high temperature and high pressure area of ​​the overdriven detonation wave, and then forms a stable detonation wave that propagates forward. But it takes a long distance for the flame to accelerate to form a localized hot spot, limiting the frequency at which the engine can opera...

AI Technical Summary

Problems solved by technology

[0004] Although the operating frequency of the two-stage pulse detonation engine is very high, theoretically it can reach tens of kilohertz, but the existing experimental research shows that the combustion mode in the concave cavity is mainly deflagration, and no high-frequency detonation is formed.

There are many reasons for this, such as the combustion of the pre-combustion chamber failed to produce a high-temperature small-molecule combustible gas mixture rich in active radicals, and the concave surface of the shock-wave focusing concave cavity is not the optimal form

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