Interaction of a shock train with inherent isentropic waves in a curved isolator

doi:10.1063/5.0095277

CORC > 力学研究所 > 中国科学院力学研究所 > 高温气体动力学国家重点实验室

	Interaction of a shock train with inherent isentropic waves in a curved isolator
	He, Li-hao; Chen, Hao; Yue, Lian-jie; Zhang, Qi-fan; Wu, Wan-nan
刊名	PHYSICS OF FLUIDS
	2022-06-01
卷号	34 期号:6 页码:21
ISSN号	1070-6631
DOI	10.1063/5.0095277
通讯作者	Chen, Hao(chenhao@imech.ac.cn)
英文摘要	Shock-train transitions in simplified curved isolators are carefully studied by simulation. The results show the shock-train behavior is subject to the complex pressure field created by the duct deflection, eventually presenting five modes during a backpressure-varying process. Of them, the most special one is the abrupt shock-train leap. It appears as the leading shocks interact with an adverse pressure gradient and follows a different path after a reversal of the direction the backpressure takes, which causes a shock-train hysteresis. If the curvature increases, the leap phenomenon, together with the related hysteresis, grows in number and intensity. Analysis indicates the background pressure gradients stem from the inherent left-running expansion waves and right-running compression waves. They control alternately the near-wall flow state, provoking the cyclic changes in the pressure gradient sign. Unlike the former, the latter can enhance separation through a positive feedback mechanism, rendering the shock train highly sensitive to backpressure. This is why the leap occurs. Comparing with the previously reported shock-induced leap indicates that there is a marked similarity in their behaviors, suggesting the irrelevance of the occurrence of a leap to the category of incident waves. Nevertheless, a delay in the onset usually follows a compression-wave-typed leap, which reflects that there is a triggering threshold for an incident wave. Given the fact that no local separation is provoked by the compression waves, it is speculated that the threshold should lie below the criterion for causing a separation, as opposed to the impression from the previous research. Published under an exclusive license by AIP Publishing.
资助项目	National Natural Science Foundation of China[12102440] ; National Natural Science Foundation of China[U2141220] ; National Natural Science Foundation of China[11902325]
WOS关键词	MECHANISM ; SCRAMJET ; BEHAVIOR ; MODEL ; INLET ; PATH
WOS研究方向	Mechanics ; Physics
语种	英语
WOS记录号	WOS:000876609700010
资助机构	National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/90651]
专题	力学研究所_高温气体动力学国家重点实验室
通讯作者	Chen, Hao
作者单位	Chinese Acad Sci, Inst Mech, State Key Lab High Temp Gas Dynam, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	He, Li-hao,Chen, Hao,Yue, Lian-jie,et al. Interaction of a shock train with inherent isentropic waves in a curved isolator[J]. PHYSICS OF FLUIDS,2022,34(6):21.
APA	He, Li-hao,Chen, Hao,Yue, Lian-jie,Zhang, Qi-fan,&Wu, Wan-nan.(2022).Interaction of a shock train with inherent isentropic waves in a curved isolator.PHYSICS OF FLUIDS,34(6),21.
MLA	He, Li-hao,et al."Interaction of a shock train with inherent isentropic waves in a curved isolator".PHYSICS OF FLUIDS 34.6(2022):21.