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Numerical study on reflection of an oblique detonation wave on an outward turning wall

机译：倾斜爆轰波对向外转动墙体的反射数值研究

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摘要

Oblique detonation waves (ODWs) have been studied widely as the basis of detonation-based hypersonic engines, but there are few studies on ODWs in a confined space. This study simulates ODW reflection on a solid wall before an outward turning corner for a simplified combustor-nozzle flow based on a two-step kinetic model. Numerical results reveal three types of ODW structures: stable, critical, and unstable. When the reflection occurs at the turning point, the stable ODW structure remains almost the same as before reflection. When the wave reflects at the wall before the turning point, either the critical structure or the unstable structure arises, which has never been investigated before. Both structures have the same initial two-section detonation surface: but the critical one becomes stationary at a certain position, while the unstable one keeps traveling upstream. By adjusting the location of the expansion wave and degree of the turning angle, the difference of the two structures is attributed to the thermal choking appearing only in the unstable structure. The thermal choking is achieved by the merging of subsonic zones, whose dependence on the various parameters is discussed.
机译：倾斜爆震波（ODWS）已被广泛研究作为基于爆炸的超音速发动机的基础，但是狭小空间中的ODWS仍有很少的研究。本研究在基于两步动力学模型的简化燃烧室喷嘴流动之前模拟了在固体壁上的OTW反射。数值结果显示了三种类型的ODW结构：稳定，致力，不稳定。当在转折点发生反射时，稳定的ODW结构保持与反射之前的几乎相同。当波在转弯之前在墙壁处反射时，产生临界结构或不稳定的结构，从未在以前进行过调查。两个结构具有相同的初始两截面爆轰表面：但是临界人在某个位置变得静止，而不稳定的则一直在上游行驶。通过调节膨胀波的位置和转动角度的程度，两个结构的差异归因于仅在不稳定结构中出现的热呼吸。通过亚音区的合并来实现热窒息，其依赖于各种参数的依赖。

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  • 来源
    《Physics of fluids》 |2020年第4期|共10页
  • 作者

    Wang Kuanliang; Zhang Zijian; Yang Pengfei; Teng Honghui;

  • 作者单位

    Beijing Inst Technol Sch Aerosp Engn Beijing 100081 Peoples R China;

    Chinese Acad Sci Inst Mech State Key Lab High Temp Gas Dynam Beijing 100190 Peoples R China;

    Chinese Acad Sci Inst Mech State Key Lab High Temp Gas Dynam Beijing 100190 Peoples R China;

    Beijing Inst Technol Sch Aerosp Engn Beijing 100081 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 流体力学;
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