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Evolution of cellular structures on oblique detonation surfaces
Teng HH(滕宏辉); Ng HD; Li K(李康); Luo CT(罗长童); Jiang ZL(姜宗林); Teng, HH (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab High Temp Gas Dynam, Beijing 100190, Peoples R China.
AbstractIn 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.
KeywordDetonation Instability Cellular Structure Transverse Wave Numerical Simulations
Subject AreaThermodynamics ; Energy & Fuels ; Engineering
Indexed BySCI ; EI
WOS IDWOS:000348411900015
Funding OrganizationThe research is supported by The National Natural Science Foundation of China NSFC Nos. 11372333 and 51376165; and the Natural Sciences and Engineering Research Council of Canada (NSERC).
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Cited Times:57[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorTeng, HH (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab High Temp Gas Dynam, Beijing 100190, Peoples R China.
Recommended Citation
GB/T 7714
Teng HH,Ng HD,Li K,et al. Evolution of cellular structures on oblique detonation surfaces[J]. COMBUSTION AND FLAME,2015,162(2):470-477.
APA Teng HH,Ng HD,Li K,Luo CT,Jiang ZL,&Teng, HH .(2015).Evolution of cellular structures on oblique detonation surfaces.COMBUSTION AND FLAME,162(2),470-477.
MLA Teng HH,et al."Evolution of cellular structures on oblique detonation surfaces".COMBUSTION AND FLAME 162.2(2015):470-477.
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