A variable cross-section lobe ejector mixer suitable for pulse detonation engines

Abstract

The invention provides a variable-cross-section valvular injection mixer for a pulse detonation engine. The variable-cross-section valvular injection mixer is composed of ejector convex valvular parts(1), ejector concave valvular parts (2), ejector straight pipe section parts (3), cone annular baffles (4), supporting rods (5), a detonation pipe (6), and an ejector main part (7) formed by combination of the (1)-(3) parts. The inlet of an ejector is in a wave-valvular shape. The convex valvular parts (1) and the concave valvular parts (2) are periodically arranged in a stagger mode in the circumferential direction, and therefore the injection amount and the mixing effect can be improved. Most of injection airflow flows from the convex valvular structures (1). The cross sections of flowing channels gradually reduce from upstream to downstream. The forward flow resistance loss in the ejector is less than the backward flow resistance loss. High pressure gas return of the outlet of the detonation pipe (6) can be restrained. The cone annular baffles (4) are mounted at the outlet of the detonation pipe (6) to block counter-current propagation of high pressure gas. When the variable-cross-section valvular injection mixer is applied to the pulse detonation engine, forward propagation of the high pressure gas and pressure waves at engine outlet can be effectively suppressed when the inlet flow resistance is small. Negative thrust is reduced, and forward thrust is increased.

Description

technical field [0001] The invention relates to the technical field of pulse detonation engines, and relates to the design of a variable-section lobe-shaped injector mixer suitable for pulse detonation engines. Background technique [0002] Pulse Detonation Engines (PDE) is a new concept engine that uses intermittent detonation waves to generate thrust. According to whether it has its own oxidant, pulse detonation engines can be divided into air-breathing pulse detonation engines and rocket-type pulse detonation engines. Due to the potential advantages of PDE, such as high thermal cycle efficiency, simple structure, and light weight, many countries have actively carried out related research in recent years. [0003] Although PDEs have great potential advantages over existing propulsion systems, there are still many challenges and problems to realize these potential advantages. One of the key problems is how to improve the propulsion efficiency of PDE. Propulsion efficienc...

AI Technical Summary

Problems solved by technology

It is precisely because of the highly under-expansion characteristics of the PDE exhaust process that conventional gas turbine engine ejector mixers are no longer applicable, and it is urgent to develop ejector mixers with PDE as the application background

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