Jet ignition device of pulse detonation engine

Abstract

The invention relates to a jet ignition device of a pulse detonation engine, which is characterized in that a jet tube is fixedly connected with a mixing chamber through a sealing clamp nut, an adjusting plug is mounted at the top end of the jet tube through a sealing nut and a clamping nut; a drain tube is arranged in a jet chamber inside the jet tube and is connected with the jet tube through a fixing rib, and the lower end of the drain tube extends into the mixing chamber; and an ignition seat is arranged on one side of the jet tube and is located at one end of an outlet of the drain tube. Compared with the time and the distance for generating detonation waves by normal ignition devices, the time and the distance for generating the detonation waves by the jet ignition device are shorter, accordingly the DDT (deflagration to detonation transition) time and distance is shortened. In this case, length of a detonation chamber can be further shortened so as to improve working frequency of the pulse detonation engine. After the detonation chamber is shortened, exhausting burden in the pulse detonation engine is reduced, so that expansion wave-beams generated from the outlet of the pulse detonation engine can catch up with pressure waves transmitted before, pressure disturbance in an air-inlet passage is reduced, and working stability of the pulse detonation engine is enhanced while better propulsive performance is achieved.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a jet ignition device for a pulse detonation engine. Background technique [0002] The pulse detonation engine is a new concept propulsion device that uses high-temperature, high-pressure gas generated by intermittent detonation waves to generate thrust. Pulse detonation engines are divided into air-breathing pulse detonation engines and rocket-type pulse detonation engines according to whether they have their own oxidant. [0003] Since direct triggering of detonation requires a huge amount of ignition energy, in terms of practicability, weak spark ignition and pre-detonation tube ignition are generally used for ignition of pulse detonation engines. The former achieves detonation combustion through the optimal design of the ignition zone and the transition from deflagration to detonation (DDT). The latter is generally by igniting the mixture in the pre-explosion tube, the gas ...

AI Technical Summary

Problems solved by technology

Although the form of weak spark ignition is simple, it requires a long DDT distance due to the small ignition energy

A longer DDT distance will limit the increase of engine frequency, which is not conducive to improving engine performance

Although the pre-detonation tube ignition has a large ignition energy and can reduce the DDT distance, this ignition method requires a pre-detonation tube to detonate the main detonation tube. The pre-detonation tube requires an additional oil and gas supply and ignition system, which increases the system The complexity of the explosion will also bring about the work matching problem of the pre-explosion tube and the main detonation tube

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