Low-flow-resistant near-wall small-space annular shock wave focusing direct priming device

Abstract

The invention discloses a low-flow-resistant near-wall small-space annular shock wave focusing direct priming device which comprises a pulse detonation engine, an ignition system and feeding system. The pulse detonation engine comprises a main detonation chamber and a sealing cover, and an annular near-wall space passage is formed between the sealing cover and the main detonation chamber. The priming device has the advantages that the device is simple in structure, and the length of the pulse detonation engine is not increased; the high-temperature and high-pressure hot point generated by annular shock wave focusing is used as the ignition source of the main detonation chamber, the duration for transiting the pulse detonation engine from knock to detonation can be reduced effectively, and the flow resistance in the main detonation chamber is lowered; the annular near-wall space passage of the priming device is small and short, low in mounting space requirements, capable of generating high-intensity shock waves in a short distance and capable of effectively controlling the resistance loss of the pulse detonation engine, and the area of the annular near-wall space passage can be changed according to different detonation limits of different fuels.

Description

technical field [0001] The invention relates to the technical field of high-energy ignition, in particular to a ring-shaped shock wave focusing direct detonation device in a small space near a wall with low flow resistance. Background technique [0002] A typical working cycle of a pulse detonation engine includes four basic processes: ① The detonation chamber is filled with fresh combustible gas mixture (including the filling of insulating gas). ② Ignite and detonate. ③The detonation wave propagates to the open end of the detonation tube. ④ Expansion and exhaust process. The detonation wave is the coupling body of the leading shock wave and the chemical reaction, which has the characteristics of self-sustained propagation and strong discontinuity. The formation process of the detonation wave is very complicated, and has always been a hot spot in the field of detonation (or detonation) research. Ignition and detonation is the most important link in the PDE (pulse detonati...

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Problems solved by technology

[0004] The problem to be solved by the present invention is to provide a direct detonation device with circular shock wave focusing in a small space near the wall with low flow resistance, which can overcome the long transition distance from deflagration to detonation caused by low ignition energy in the process of indirect detonation of pulse detonation engines. Disadvantages of large flow resistance loss

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