Numerical study on unstable surfaces of oblique detonations

CORC > 力学研究所 > 中国科学院力学研究所 > 高温气体动力学国家重点实验室

	Numerical study on unstable surfaces of oblique detonations
	Teng, Hong Hui 1; Jiang, Zong Lin 1; Ng, Hoi Dick 2
刊名	JOURNAL OF FLUID MECHANICS
	2014-04-01
通讯作者邮箱	hhteng@imech.ac.cn
卷号	744 页码:111-128
关键词	compressible flows detonation waves
ISSN号	0022-1120
通讯作者	Teng, HH (reprint author),Chinese Acad Sci, Inst Mech, State Key Lab High Temp Gas Dynam, Beijing 100190, Peoples R China
产权排序	[Teng, HH, Jiang ZL]Chinese Acad Sci, Inst Mech, State Key Lab High Temp Gas Dynam, Beijing 100190, Peoples R China; [Ng, HD]Concordia Univ, Dept Mech & Ind Engn, Montreal, PQ H3G 1M8, Canada
合作状况	国际
中文摘要	In this study, the onset of cellular structure on oblique detonation surfaces is investigated numerically using a one-step irreversible Arrhenius reaction kinetic model. Two types of oblique detonations are observed from the simulations. One is weakly unstable characterized by the existence of a planar surface, and the other is strongly unstable characterized by the immediate formation of the cellular structure. It is found that a high degree of overdrive suppresses the formation of cellular structures as confirmed by the results of many previous studies. However, the present investigation demonstrates that cellular structures also appear with degree of overdrive of 2.06 and 2.37, values much higher than similar to 1.8 suggested previously in the literature for the critical value defining the instability boundary of oblique detonations. This contradiction could be explained by the use of differently shaped walls, a straight wall used in this study and a custom-designed curved wedge system so as to induce straight oblique detonations in previous studies. Another possible reason could be due to the low and possibly insufficient resolution used in previously published studies. Hence, simulations with different grid sizes are also performed to examine the effect of resolution on the numerical solutions. Using the present results, analysis also shows that although the characteristic lengths of unstable surfaces are different when the incident Mach number changes, these length scales are proportional to tangential velocities. Hence, the interior time determined by the overdrive degree is identified, and its limitation as the instability parameter is discussed.
英文摘要	In this study, the onset of cellular structure on oblique detonation surfaces is investigated numerically using a one-step irreversible Arrhenius reaction kinetic model. Two types of oblique detonations are observed from the simulations. One is weakly unstable characterized by the existence of a planar surface, and the other is strongly unstable characterized by the immediate formation of the cellular structure. It is found that a high degree of overdrive suppresses the formation of cellular structures as confirmed by the results of many previous studies. However, the present investigation demonstrates that cellular structures also appear with degree of overdrive of 2.06 and 2.37, values much higher than similar to 1.8 suggested previously in the literature for the critical value defining the instability boundary of oblique detonations. This contradiction could be explained by the use of differently shaped walls, a straight wall used in this study and a custom-designed curved wedge system so as to induce straight oblique detonations in previous studies. Another possible reason could be due to the low and possibly insufficient resolution used in previously published studies. Hence, simulations with different grid sizes are also performed to examine the effect of resolution on the numerical solutions. Using the present results, analysis also shows that although the characteristic lengths of unstable surfaces are different when the incident Mach number changes, these length scales are proportional to tangential velocities. Hence, the interior time determined by the overdrive degree is identified, and its limitation as the instability parameter is discussed.
学科主题	Mechanics ; Physics
分类号	一类
类目[WOS]	Mechanics ; Physics, Fluids & Plasmas
研究领域[WOS]	Mechanics ; Physics
关键词[WOS]	ONE-DIMENSIONAL DETONATIONS ; IDEALIZED DETONATIONS ; 2-DIMENSIONAL DETONATIONS ; NONLINEAR STABILITY ; SHOCK-WAVES ; SIMULATIONS ; ACCURACY ; WEDGE ; COMBUSTION ; RESOLUTION
收录类别	SCI
原文出处	http://dx.doi.org/10.1017/jfm.2014.78
语种	英语
WOS记录号	WOS:000333188800008
公开日期	2014-05-05
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/48740]
专题	力学研究所_高温气体动力学国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Mech, State Key Lab High Temp Gas Dynam, Beijing 100190, Peoples R China 2.Concordia Univ, Dept Mech & Ind Engn, Montreal, PQ H3G 1M8, Canada
推荐引用方式 GB/T 7714	Teng, Hong Hui,Jiang, Zong Lin,Ng, Hoi Dick. Numerical study on unstable surfaces of oblique detonations[J]. JOURNAL OF FLUID MECHANICS,2014,744:111-128.
APA	Teng, Hong Hui,Jiang, Zong Lin,&Ng, Hoi Dick.(2014).Numerical study on unstable surfaces of oblique detonations.JOURNAL OF FLUID MECHANICS,744,111-128.
MLA	Teng, Hong Hui,et al."Numerical study on unstable surfaces of oblique detonations".JOURNAL OF FLUID MECHANICS 744(2014):111-128.