A structure for suppressing forward transmission of gas in an air-breathing pulse detonation engine

Abstract

The invention provides an air-suction type pulse detonation engine structure for suppressing fuel gas pre-transmission, and belongs to the technical field of pulse detonation engines. The structure is composed of buffering cavities (2), thorn-shaped ribs (3), pressure relief channels (4), inner duct shells (5) and an outer duct shell (6), wherein the buffering cavities (2) are small cavities defined by the inner duct shells (5) and the thorn-shaped ribs (3); the thorn-shaped ribs (3) are in a inner duct, and the roots of the thorn-shaped ribs (3) are connected with the inner sides of the inner duct shells (5); pressure relief channels (4) are the channels communicating with the inner duct and a outer duct; and the central axis of the inner duct shell, the central axis of the outer duct shell and the central axis of a detonation combustion chamber are coaxial. According to the air-suction type pulse detonation engine structure for suppressing fuel gas pre-transmission, under the condition that the air inlet flow resistance is small, fuel gas and pressure pre-transmission of the air-suction type pulse detonation engine can be effectively inhibited, meanwhile, the thrust loss of the air-suction type pulse detonation engine is reduced, and thus the engineering application of the air-suction type pulse detonation engine is further promoted.

Description

technical field [0001] The invention relates to the technical field of pulse detonation engines, in particular to a structure for suppressing forward transmission of gas in an air-breathing pulse detonation engine. Background technique [0002] Engines using detonation combustion have lower entropy increase than conventional isobaric combustion engines, and will become a common combustion method for future engines. Pulse detonation engine (Pulse Detonation Engine, PDE) is a new concept engine that uses intermittent detonation combustion to generate high temperature and high pressure gas to generate periodic thrust. Its single cycle includes four main processes: filling of fresh combustible gas mixture, ignition and formation of detonation wave, propagation of detonation wave and discharge of combustible gas. Improving the PDE operating frequency is the main research content now, and the key is to shorten the time consumed in the filling process of fresh combustible gas mixt...

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Problems solved by technology

[0005] In order to overcome the difficulty of air intake and thrust loss caused by the gas forward transmission problem in the APDE working process, and the shortcomings of the existing structure that inhibits the gas forward transmission, the air intake flow resistance is large, the present invention proposes an air-breathing pulse detonation engine to suppress the gas forward transmission The structure is arranged between the detonation combustion chamber and the intake port, which can effectively suppress the forward transmission of gas and pressure and reduce thrust loss at the same time when the intake air flow resistance is small

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