Pulse detonation engine with ejector and method for processing main detonation tube

Abstract

The invention provides a pulse detonation engine with an ejector and a method for processing a main detonation tube. The invention is characterized in that one end of an ejector is a horn-shaped expansion section, the wall surface of the expansion section is a 1/4 arch wall surface; the relation between the radius R of an arc section and the inner diameter D of a cylindrical section is as follows: 2/5is less than or equal to R/Dis less than or equal to 3/5; the ejector and a main detonation tube are installed coaxially, the relation between the inner diameter d of the main detonation tubes and D is as follows: 2/5is less than or equal to d/Dis less than or equal to 3/5; L represents the axial distance the main detonation tube stretches into the ejector, the relation between L and d is as follows: 2is less than or equal to L/dis less than or equal to 6; a spiral channel is arranged in the tube wall of the main detonation tube. In the invention, by designing the entrance structure of the ejector, the structural relationship between the main detonation tube and the ejector and the spiral channel in the tube wall of the main detonation tube, reignited fuel oil can be fully heated inside the tube wall, which is conducive to the reduction of DDT (deflagration to detonation transition) distance, the lowering of the temperature of the main detonation tube and the lengthening of the thermal fatigue life of the main detonation tube.

Description

technical field [0001] The invention relates to the field of engines, in particular to a pulse detonation engine with an ejector and a processing method for a main detonation tube. Background technique [0002] The pulse detonation engine (PDE) is a new concept engine that uses pulse detonation waves to generate thrust. Since the pulse detonation engine is still in the initial stage of research, there are many challenges and difficulties, especially in increasing the engine thrust. aspect. At present, for a PDE with a fixed volume, there are generally two ways to improve the thrust performance: one is to increase the repetition rate, and the other is to increase the impulse per unit pulse. [0003] For the second method, the thrust can be increased by changing the structure of the intake port, detonation section, tail nozzle, etc., but according to domestic and foreign research in recent years, the thrust has not been greatly improved only by the above means . The use of ...

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