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Effects of inflow Mach number on oblique detonation initiation with a two-step induction-reaction kinetic model
Yang PF; Teng HH(滕宏辉); Jiang ZL(姜宗林); Ng HD
AbstractOblique detonations induced by two-dimensional, semi-infinite wedges are simulated by solving numerically the reactive Euler equations with a two-step induction-reaction kinetic model. Previous results obtained with other models have demonstrated that for the low inflow Mach number M-0 regime past a critical value, the wave in the shocked gas changes from an oblique reactive wave front into a secondary oblique detonation wave (ODW). The present numerical results not only confirm the existence of such critical phenomenon, but also indicate that the structural shift is induced by the variation of the main ODW front which becomes sensitive to M-0 near a critical value. Below the critical M-0,M-cr, oscillations of the initiation structure are observed and become severe with further decrease of M-0. For low M-0 cases, the non-decaying oscillation of the initiation structure exists after a sufficiently long-time computation, suggesting the quasi-steady balance of initiation wave systems. By varying the heat release rate controlled by k(R), the pre-exponential factor of the second reaction step, the morphology of initiation structures does not vary for M-0 = 10 cases but varies for M-0 = 9 cases, demonstrating that the effects of heat release rate become more prominent when M-0 decreases. The instability parameter chi is introduced to quantify the numerical results. Although chi cannot reveal the detailed mechanism of the structural shift, a linear relation between chi and k(R) exists at the critical condition, providing an empirical criterion to predict the structural variation of the initiation structure. (C) 2018 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
KeywordOblique detonation Induction-reaction kinetics Initiation length Initiation structure
Indexed BySCI ; EI
WOS IDWOS:000436899700020
WOS Research AreaThermodynamics ; Energy & Fuels ; Engineering, Multidisciplinary ; Engineering, Chemical ; Engineering, Mechanical
WOS SubjectThermodynamics ; Energy & Fuels ; Engineering
Funding OrganizationNational Natural Science Foundation of China NSFC [91641130, 11372333, 51376165] ; Natural Sciences and Engineering Research Council of Canada (NSERC)
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Cited Times:35[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Beijing Inst Technol, Sch Aerosp Engn, Dept Mech, Beijing 100081, Peoples R China
2.Chinese Acad Sci, Inst Mech, State Key Lab High Temp Gas Dynam, Beijing 100190, Peoples R China
3.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
4.Concordia Univ, Dept Mech Ind & Aerosp Engn, Montreal, PQ H3G 1M8, Canada
Recommended Citation
GB/T 7714
Yang PF,Teng HH,Jiang ZL,et al. Effects of inflow Mach number on oblique detonation initiation with a two-step induction-reaction kinetic model[J]. COMBUSTION AND FLAME,2018,193:246-256.
APA Yang PF,滕宏辉,姜宗林,&Ng HD.(2018).Effects of inflow Mach number on oblique detonation initiation with a two-step induction-reaction kinetic model.COMBUSTION AND FLAME,193,246-256.
MLA Yang PF,et al."Effects of inflow Mach number on oblique detonation initiation with a two-step induction-reaction kinetic model".COMBUSTION AND FLAME 193(2018):246-256.
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