A Wedge Surface Structure Using Thermal Jet to Control Oblique Detonation Wave Initiation

Abstract

The invention belongs to the field of oblique detonation engines, and in particular relates to a wedge surface structure for controlling the initiation of oblique detonation waves by using heat jets. A nozzle in the same direction as the jet is provided at the end of the straight wedge surface close to the engine inlet. The detonation products of the engine are introduced and ejected from the nozzle to generate a hot jet. The ejected hot jet forms a gas wedge surface, and the gas wedge The surface induces a new oblique shock wave, which stabilizes the oblique detonation wave at the position of the jet. In the present invention, a co-direction nozzle is arranged on the basis of a straight wedge surface, and the detonation products of the engine are introduced and ejected from the nozzle. The ejected hot jet forms a gas wedge surface, and the gas wedge surface induces a new oblique excitation. The oblique detonation wave can be detonated by the temperature rise of the oblique shock wave; the wedge surface structure of the present invention can stabilize the oblique detonation wave at the optimal position through the thermal jet at a small wedge surface angle, and at the same time make the resistance Minimal, total pressure loss for optimum thrust performance.

Description

Technical field [0001] The present invention belongs to the field of oblique explosion engine, and more particularly to a wedge structure that utilizes a thermal jets to control the blast wave. Background technique [0002] The oblique explosion engine is the ideal engine with a high supersonic aircraft. The working principle of the oblique explosion engine is that the supersonic flow stream is impact compression on the wedge surface to form an oblique wave, and the temperature pressure after the inclined wave is raised, the speed is lowered, and the oblique blast wave is exploded after a segment of inducing segment. [0003] According to the operation characteristics of the oblique explosion engine, it is understood that the wedge angle cannot be too large. The excessive wedge angle can make the mixture prematurely, affect thrust performance, and excessive wedge angle increase resistance; wedge angle It is not too small because the smaller the wedge angle, the lower the post-inv...

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Problems solved by technology

[0003] According to the working characteristics of the oblique detonation engine, it can be known that the wedge angle should not be too large. Too large wedge angle will cause the mixture to dissociate prematurely and affect the thrust performance. At the same time, too large wedge angle will increase the resistance; wedge angle It cannot be too small, because the smaller the wedge angle, the lower the static temperature after the oblique shock wave, and the longer the induced length, which will increase the size of the engine and increase the weight of the engine

And if a straight wedge is used, it is difficult to control the detonation wave by changing the angle of the wedge

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