| Mechanisms of the destabilized Mach reflection of inviscid oblique detonation waves before an expansion corner | |
Zhang, Zijian1; Liu YF(刘云峰)2,3 ; Wen, Chihyung1
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| Corresponding Author | Wen, Chihyung([email protected]) |
| Source Publication | JOURNAL OF FLUID MECHANICS
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| 2022-04-11 | |
| Volume | 940Pages:39 |
| ISSN | 0022-1120 |
| Abstract | The stabilization of oblique detonation waves (ODWs) in an engine combustor is important for the successful applications of oblique detonation engines, and comprehensively understanding the effects of the inviscid reflection of ODWs on their stabilization and the relevant mechanisms is imperative to overall combustor design. In this study, the flow fields of ODW reflections in a space-confined combustor are numerically studied by solving the two-dimensional time-dependent multispecies Euler equations in combination with a detailed hydrogen combustion mechanism. The inviscid Mach reflections of ODWs before an expansion corner are emphasized with different flight Mach numbers, Ma, and different dimensionless reflection locations, zeta >= 0 (zeta = 0: the ODW reflects precisely at the expansion corner; zeta > 0: the ODW reflects off the wall before the expansion corner). Two kinds of destabilization phenomena of the inviscid Mach reflection of an ODW induced by different mechanisms are found, namely wave-induced destabilization at large zeta > 0 for moderate (not very low) Ma and inherent destabilization at any zeta > 0 for low Ma. Wave-induced destabilization is attributed to the incompatibility between the pressure ratio across the Mach stem and its relative propagation speed, which is triggered by the action of the secondary reflected shock wave or the transmitted Mach stem on the subsonic zone behind the Mach stem. Inherent destabilization is demonstrated through an in-depth theoretical analysis and is attributed to geometric choking of the flow behind the Mach stem. |
| Keyword | detonation waves |
| DOI | 10.1017/jfm.2022.226 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000780390900001 |
| WOS Keyword | ACETYLENE-OXYGEN MIXTURES ; SUPERSONIC COMBUSTION ; ADAPTIVE SIMULATIONS ; INITIATION ; PROPULSION ; TRANSITION ; WEDGE ; FLOW ; STABILIZATION ; CHALLENGES |
| WOS Research Area | Mechanics ; Physics |
| WOS Subject | Mechanics ; Physics, Fluids & Plasmas |
| Funding Project | National Natural Science Foundation of China[11772284] ; National Natural Science Foundation of China[11672312] ; National Natural Science Foundation of China[11532014] |
| Funding Organization | National Natural Science Foundation of China |
| Classification | 一类/力学重要期刊 |
| Ranking | 2 |
| Contributor | Wen, Chihyung |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/88833 |
| Collection | 高温气体动力学国家重点实验室 |
| Affiliation | 1.Hong Kong Polytech Univ, Dept Aeronaut & Aviat Engn, Kowloon, Hong Kong, Peoples R China; 2.Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China; 3.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China |
| Recommended Citation GB/T 7714 | Zhang, Zijian,Liu YF,Wen, Chihyung. Mechanisms of the destabilized Mach reflection of inviscid oblique detonation waves before an expansion corner[J]. JOURNAL OF FLUID MECHANICS,2022,940:39.Rp_Au:Wen, Chihyung |
| APA | Zhang, Zijian,刘云峰,&Wen, Chihyung.(2022).Mechanisms of the destabilized Mach reflection of inviscid oblique detonation waves before an expansion corner.JOURNAL OF FLUID MECHANICS,940,39. |
| MLA | Zhang, Zijian,et al."Mechanisms of the destabilized Mach reflection of inviscid oblique detonation waves before an expansion corner".JOURNAL OF FLUID MECHANICS 940(2022):39. |
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