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Title:
Evolution of cellular structures on oblique detonation surfaces
Author: Teng HH(滕宏辉); Ng HD; Li K(李康); Luo CT(罗长童); Jiang ZL(姜宗林)
Source: COMBUSTION AND FLAME
Issued Date: 2015-02
Volume: 162, Issue:2, Pages:470-477
Abstract: In this study, numerical simulations using the inviscid Euler equations with one-step Arrhenius chemistry model are carried out to investigate the effects of activation energy and wedge angle on the stability of oblique detonation surfaces. Two kinds of cellular structure are studied, one is featured by a single group of transverse waves traveling upstream, referred to as LRTW (left-running transverse waves), and the other is featured by additional RRTW (right-running transverse waves). The present computational simulation reveals the formation of un-reacted gas pockets behind the cellular oblique detonation. Numerical smoked foil records are produced to show the emergence of the two types of transverse waves and the evolution of the unstable cellular structure of the oblique detonation. The transverse wave dynamics, including the colliding, emerging and splitting types, are found to be similar to the normal detonation propagation, demonstrating the instability mechanism is originated from the inherent instability of cellular detonations. Statistical analysis on the cellular structure is carried out to observe quantitatively the influences of activation energy and wedge angle. Results from the parametric study show that high activation energy and low wedge angle are favorable to the LRTW formation. However, the condition for the RRTW formation is more complex. In the case of low activation energy, small wedge angle is beneficial to the RRTW formation, as to the LRTW formation. In contrary, for high activation energy, there appears one moderate wedge angle favoring the RRTW formation and giving the shortest length between the onset of both LR and RR transverse waves. For quantitative comparison, we analyze the variation of two distances with the wedge angle, one is between the detonation initiation and LRTW formation points, and the other between LRTW and RRTW formation points. Results show the latter is relatively less pronounced than the former, indicating the RRTW formation depends mainly on the activation energy and the generation of LRTW. (C) 2014 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
Keyword: Detonation ; Instability ; Cellular structure ; Transverse wave ; Numerical simulations
Language: 英语
Indexed Type: SCI ; EI
Corresponding Author: Teng, HH (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab High Temp Gas Dynam, Beijing 100190, Peoples R China.
DOI: 10.1016/j.combustflame.2014.07.021
Related URLs: 查看原文
WOS ID: WOS:000348411900015
ISSN: 0010-2180
Rank: [Teng, Honghui; Li, Kang; Luo, Changtong; Jiang, Zonglin] Chinese Acad Sci, Inst Mech, State Key Lab High Temp Gas Dynam, Beijing 100190, Peoples R China; [Ng, Hoi Dick] Concordia Univ, Dept Mech & Ind Engn, Montreal, PQ H3G 1M8, Canada
Subject: Thermodynamics ; Energy & Fuels ; Engineering
Department: LHD激波与爆轰物理
Classification: 一类
Citation statistics:
Content Type: 期刊论文
URI: http://dspace.imech.ac.cn/handle/311007/49588
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,Li K,et al. Evolution of cellular structures on oblique detonation surfaces[J]. COMBUSTION AND FLAME,2015-02-01,162(2):470-477.
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