| Interaction of a shock train with inherent isentropic waves in a curved isolator | |
He LH(贺理浩) ; Chen H(陈昊); Yue LJ(岳连捷); Zhang QF(张启帆); Wu WN(邬婉楠)
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| Corresponding Author | Chen, Hao([email protected]) |
| Source Publication | PHYSICS OF FLUIDS
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| 2022-06-01 | |
| Volume | 34Issue:6Pages:21 |
| ISSN | 1070-6631 |
| Abstract | 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. |
| DOI | 10.1063/5.0095277 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000876609700010 |
| WOS Keyword | MECHANISM ; SCRAMJET ; BEHAVIOR ; MODEL ; INLET ; PATH |
| WOS Research Area | Mechanics ; Physics |
| WOS Subject | Mechanics ; Physics, Fluids & Plasmas |
| Funding Project | National Natural Science Foundation of China[12102440] ; National Natural Science Foundation of China[U2141220] ; National Natural Science Foundation of China[11902325] |
| Funding Organization | National Natural Science Foundation of China |
| Classification | 一类/力学重要期刊 |
| Ranking | 1 |
| Contributor | Chen, Hao |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/90652 |
| Collection | 高温气体动力学国家重点实验室 |
| Affiliation | Chinese Acad Sci, Inst Mech, State Key Lab High Temp Gas Dynam, Beijing 100190, Peoples R China |
| Recommended Citation GB/T 7714 | He LH,Chen H,Yue LJ,et al. Interaction of a shock train with inherent isentropic waves in a curved isolator[J]. PHYSICS OF FLUIDS,2022,34,6,:21.Rp_Au:Chen, Hao |
| APA | 贺理浩,陈昊,岳连捷,张启帆,&邬婉楠.(2022).Interaction of a shock train with inherent isentropic waves in a curved isolator.PHYSICS OF FLUIDS,34(6),21. |
| MLA | 贺理浩,et al."Interaction of a shock train with inherent isentropic waves in a curved isolator".PHYSICS OF FLUIDS 34.6(2022):21. |
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| Jp2022FA354_2022_Int（8942KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Download | |
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