A two-phase high-frequency pre-explosion device

Abstract

The invention provides a two-phase high-frequency pre-detonator. The two-phase high-frequency pre-detonator comprises a pneumatic valve and a detonation duct, wherein a fuel and air distribution and mixing device, a flame diffusion device, an intensified combustion device A, an intensified combustion device B and a shock reflection device are sequentially installed in the denotation duct along the flowing direction of air and fuel, the distance L1 between the front end surface of the fuel and air distribution and mixing device and the front end surface of the denotation duct is 1.0-2.0D, an ignition groove is processed on the wall surface of the denotation duct between the fuel and air distribution and mixing device and the flame diffusion device, the distance L2 between the rear end surface of the fuel and air distribution and mixing device and the front end surface of the ignition groove is 0.5-0.7D, and the distance L3 between the rear end surface of the ignition groove and the front end of the flame diffusion device is 1.0-1.2D. The two-phase high-frequency pre-detonator has the advantage that the conversion from slow combustion to denotation is realized in a short distance by reasonably designing the internal structure of a denotation chamber, optimizing all major parts and installation positions and adopting a combined method of intensified combustion and shock reflection.

Description

technical field [0001] The invention relates to a two-phase high-frequency pre-explosion device, in particular to a pre-explosion device for a gas / liquid two-phase pulse detonation engine working above 80 Hz, and belongs to the technical field of pulse detonation engines. Background technique [0002] A pulse detonation engine (Pulse Detonation Engine, PDE) is a power device that releases chemical energy in a detonation combustion wave mode. The triggering of the detonation wave is realized in two ways, one is a direct trigger method, and the other is an indirect trigger method. Direct triggering requires an ignition energy of the order of 105J, and the use of traditional electric igniters cannot meet the direct triggering of high-frequency detonation waves; indirect triggering of detonation is achieved through the transition from slow combustion to detonation (Deflagration to Detonation Transition, DDT for short), and DDT Processes require long distances in smooth tubes. ...

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Problems solved by technology

"Acta Aeronautica Sinica" Volume 30 (2009) No. 3 has a report on "Experimental Research on Pre-explosion Tube Pulse Detonation Prototype". The main problem of the pre-explosion tube device is that the internal structure of the detonation tube is complex and the flow resistance is large. , resulting in a working frequency of only 66.7Hz, and the diameter of the pre-detonator tube is only 30mm, which is difficult to apply to large-diameter PDE detonation triggers

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