Effects of thermal stratification on detonation development in hypersonic reactive flows

doi:10.1103/PhysRevFluids.9.083202

	Effects of thermal stratification on detonation development in hypersonic reactive flows
	Yang PF(杨鹏飞)1,2 ; Yu DH(于德海)1,2; Chen, Zheng 2; Teng, Honghui 3; Ng, Hoi Dick 4
通讯作者	Teng, Honghui([email protected])
发表期刊	PHYSICAL REVIEW FLUIDS
	2024-08-09
卷号	9 期号:8 页码:18
ISSN	2469-990X
摘要	Gaseous detonation waves in a uniform mixture have been studied widely, but uniformity is seldom realized in practical applications such as detonation-based engines. Nonideal scenarios involving incomplete mixing and curved intake compression lead to the thermal stratification of reactants. Local high-temperature regions first trigger the reactant autoignition and even result in the untimely formation of a detonation wave. Using the two-dimensional Euler equations and a detailed H2-air reaction mechanism, we examine the effects of reactant thermal stratification on the autoignition wave morphology in hypersonic reactive flows. Three flow regimes, namely, the autoignition-driven reaction front, detonation wave, and decoupling shock/reaction front, are observed. These flow regimes are determined by the temperature gradient, and only a moderate temperature gradient can trigger an oblique detonation wave. The oblique detonation can stabilize in hypersonic inflows, primarily because the upstream autoignition region acts as an anchorage point. Comparisons of one- and two-dimensional autoignitions confirm that supersonic flow enhances the formation of pressure waves. An analysis of the reaction front propagation speeds reveals that the detonation development is determined by two aspects. One is the convergence of compression waves originating from thermal expansion and supersonic flows, and another is the reaction front propagation speed at the early stage, which must exceed the local sound speed to promote positive feedback between pressure waves and heat release.
DOI	10.1103/PhysRevFluids.9.083202
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:001290929000001
关键词[WOS]	HOT-SPOT ; IGNITION ; AUTOIGNITION ; PROPAGATION
WOS研究方向	Physics
WOS类目	Physics, Fluids & Plasmas
资助项目	National Natural Science Foundation of China[12202014] ; National Natural Science Foundation of China[12325206] ; National Natural Science Foundation of China[52176096] ; National Natural Science Foundation of China[52006001]
项目资助者	National Natural Science Foundation of China
论文分区	二类
力学所作者排名	1
RpAuthor	Teng, Honghui
引用统计	被引频次：2[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/96326
专题	高温气体动力学国家重点实验室
作者单位	1.Chinese Acad Sci, State Key Lab High Temp Gas Dynam, Inst Mech, Beijing 100190, Peoples R China; 2.Peking Univ, Coll Engn, Beijing 100871, Peoples R China; 3.Beijing Inst Technol, Sch Aerosp Engn, Beijing 100081, Peoples R China; 4.Concordia Univ, Dept Mech Ind & Aerosp Engn, Montreal, PQ H3G 1M8, Canada
推荐引用方式 GB/T 7714	Yang PF,Yu DH,Chen, Zheng,et al. Effects of thermal stratification on detonation development in hypersonic reactive flows[J]. PHYSICAL REVIEW FLUIDS,2024,9,8,:18.Rp_Au:Teng, Honghui
APA	杨鹏飞,于德海,Chen, Zheng,Teng, Honghui,&Ng, Hoi Dick.(2024).Effects of thermal stratification on detonation development in hypersonic reactive flows.PHYSICAL REVIEW FLUIDS,9(8),18.
MLA	杨鹏飞,et al."Effects of thermal stratification on detonation development in hypersonic reactive flows".PHYSICAL REVIEW FLUIDS 9.8(2024):18.