Influences of incoming flow on re-initiation of cellular detonations
Influences of incoming flow on re-initiation of cellular detonations
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DOI：
10.1016/j.combustflame.2021.02.022
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发表时间：
2021-07
影响因子：
4.4
通讯作者：
Hongbing Li;W. Han;Jianling Li;W. Fan
中科院分区：
文献类型：
--
作者：
Hongbing Li;W. Han;Jianling Li;W. Fan
超声速来流条件下的爆轰起爆研究对基于爆轰波的超声速吸气式推进具有重要意义。采用基于五阶加权基本无振荡（韦诺）模型和两步反应模型的高分辨率数值模拟方法，研究了预起爆管中产生的爆轰波向半无限自由空间或受限空间传播时，来流对二次起爆的影响。结果表明，来流对爆轰波的再起爆有促进作用，这是由于来流在上游侧加强了前导激波。此外，促进的作用之间的定量比较稳定和不稳定的爆震。爆轰二次起爆对来流速度的响应是不同的，这与爆轰波的不稳定性有关。由于点火延迟时间对激波后温度变化的响应不同，非稳定爆轰比稳定爆轰更敏感。
The study of detonation initiation under supersonic incoming flow is of significance for the supersonic air-breathing propulsion based on detonation waves. By high-resolution simulations based on the 5thorder weighted essentially non-oscillatory (WENO) and a two-step reaction model, this paper addresses the effect of incoming flow on re-initiation as a detonation generated in a pre-detonator propagates into semi-infinite free or confined space. Results show that detonation re-initiation is promoted by incoming flow because the leading shock wave is strengthened at the upstream side. Furthermore, the role of the promotion is quantitatively compared between stable and unstable detonations. Responses of detonation re-initiation to incoming flow velocity are different, which associates with the instability of detonations. Since responses of ignition delay time to the variation of post-shock temperature are different, the unstable detonation is more sensitive than the stable detonation.