|关键词: 斜爆震波 波系结构 受限空间 演化过程 膨胀波
|Wave structure and structural evolution of oblique detonation waves in confined space
QIN Jianxiu, ZHU Dehua
China Academy of Aerospace Aerodynamics，Beijing 100074，China
|In order to study wave structure of oblique detonation wave in the confined space of a real engine， numerical simulations were carried out to investigate oblique detonation wave in confined space based on Euler equations along with a detailed chemical mechanism. The wave structure and structural evolution were analyzed with different angel of the outward turning wall. Results show that Mach stem benefits from the oblique detonation wave reflection of the wall and then propagates upstream， in which Mach stem is reduced by the expansion wave emanated from the turning point at the upper wall. Stable structure featured with high temperature recirculation zone and low temperature triangle zone are formed at the outward turning wall finally. The triangle zone comprises of the wave introduced from the turning point， recirculation zone and oblique detonation wave downstream. As the angle of the outward turning wall increases， shock wave， weak compression waves and expansion waves are formed at the turning point successively， which interact with the oblique detonation wave. The oblique detonation wave downstream of the interaction point is reduced and decoupled combustion occurs at its end.
|Key words: Oblique detonation wave Wave structure Confined space Evolution process Expansion wave