Shock wave focused ignition detonation burner and ignition detonation method thereof

Abstract

The invention discloses an ignition and detonation combustor by utilizing shock wave focusing and an ignition and detonation method thereof, and belongs to the technical field of engines. According tothe combustor, a primary shock wave focusing chamber performs high-frequency reciprocating translational motion along with a dynamic concave cavity and is periodically connected and disconnected witha gas collecting flow guide cavity, generated shock waves are reflected in the concave cavity, focused to form a local high temperature and directly ignites combustible mixture to crack and oxidize macromolecular fuel in a high-pressure area, so that a large amount of easy-to-detonated activating groups and micromolecular gas are generated; and a secondary shock wave focusing chamber is reverselyarranged relative to the primary shock wave focusing chamber, the reflected shock waves in the primary shock wave focusing chamber are reflected again in the secondary shock wave focusing chamber, focused to form a three-wave structure to form a local high temperature and directly detonates detonation waves in the high-pressure area. The invention further provides an ignition and detonation method. According to the method, two-time shock wave focusing is adopted for ignition, so that the stability of the working process is effectively improved, and compared with a traditional shock wave focusing ignition mode, the method effectively enhances the high-frequency cyclic detonation characteristic.

Description

technical field [0001] The invention belongs to the technical field of engines, and more specifically relates to a shock wave focused ignition detonation combustor and an ignition and detonation method thereof. Background technique [0002] Pulse detonation engine is a new concept engine that uses high temperature and high pressure gas generated by pulse detonation waves to generate thrust. The pulse detonation engine has the advantages of simple structure, light weight, high thrust-to-weight ratio, and high combustion efficiency. Since the advent of this type of engine, it has attracted the interest of many researchers. Whether the potential of the pulse detonation engine can be brought into play depends on the high-frequency and reliable detonation shock wave. [0003] In the past few decades, people have done a lot of research work on detonation initiation technology. But at present, neither the direct detonation nor the deflagration-to-detonation (DDT) detonation metho...

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Problems solved by technology

[0004] Aiming at the above defects or improvement needs of the prior art, the present invention provides a shock wave focusing ignition detonation burner and its ignition method. The purpose is to adopt a dynamic and static double concave cavity shock focusing structure, which can effectively overcome the traditional shock Focus on ignition instability and reduce detonation tube layout space to improve fuel utilization

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