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Title:
Initiation characteristics of wedge-induced oblique detonation waves in a stoichiometric hydrogen-air mixture
Author: Teng HH(滕宏辉); Ng HD; Jiang ZL(姜宗林)
Source: PROCEEDINGS OF THE COMBUSTION INSTITUTE
Issued Date: 2017
Volume: 36, Issue:2, Pages:2735-2742
Abstract: The initiation features of two-dimensional oblique detonations from a wedge in a stoichiometric hydrogen-air mixture are investigated via numerical simulations using the reactive Euler equations with de-tailed chemistry. A parametric study is performed to analyze the effect of inflow pressure P-0 and Mach number M-0 on the initiation structure and length. The present numerical results demonstrate that the two transition patterns i.e. an abrupt transition from a multi-wave point connecting the oblique shock and the detonation surface and a smooth transition via a curved shock depend strongly on the inflow Mach number while the inflow pressure is found to have little effect on the oblique shock-to-detonation transition type. The present results also reveal a slightly more complex structure of abrupt transition type in the case of M-0 = 7.0 consisting of various chemical and gasdynamic processes in the shocked gas mixtures. The present results show quantitatively that the initiation length decreases with increasing M-0 primarily due to the in-crease of post-shock temperature. Furthermore the effect of M-0 on initiation length is independent of P-0 but given the same M-0 the initiation length is found to be inversely proportional to P-0. Theoretical analysis based on the constant volume combustion (CVC) theory is also performed and the results are close to the numerical simulations in the case of high M-0 regardless of P-0 demonstrating that the post-oblique-shock condition i.e. post-shock temperature is the key parameter affecting the initiation. At decreasing M-0 the CVC theory breaks down suggesting a switch from chemical kinetics-controlled to a wave-controlled gasdynamic process. For high inflow pressure P-0 at decreasing M-0 the CVC theoretical estimations depart from numerical results faster than those of low P-0 due to the presence of the non-monotonic effects of chemical kinetic limits in hydrogen oxidation at high pressure. (C) 2016 by The Combustion Institute. Published by Elsevier Inc.
Keyword: Oblique detonation ; Formation structure ; Hydrogen ; Shock wave ; Detailed chemistry
Language: 英语
Indexed Type: SCI ; EI
DOI: 10.1016/j.proci.2016.09.025
DOC Type: Article
WOS Subject: Thermodynamics ; Energy & Fuels ; Engineering, Chemical ; Engineering, Mechanical
WOS Subject Extended: Thermodynamics ; Energy & Fuels ; Engineering
WOS Keyword Plus: CHEMICAL-KINETICS ; COMBUSTION ; SIMULATION ; STABILITY ; ALGORITHM ; SURFACES ; WAMR
WOS ID: WOS:000397458900123
ISSN: 1540-7489
Funder: NSFC(11372333 ; 51376165)
Department: LHD激波与爆轰物理
First Institution (Yes or Not): true
Citation statistics:
Content Type: 期刊论文
URI: http://dspace.imech.ac.cn/handle/311007/60597
Appears in Collections:高温气体动力学国家重点实验室_期刊论文

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Recommended Citation:
Teng HH,Ng HD,Jiang ZL. Initiation characteristics of wedge-induced oblique detonation waves in a stoichiometric hydrogen-air mixture[J]. PROCEEDINGS OF THE COMBUSTION INSTITUTE,2017-01-01,36(2):2735-2742.
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