Effect of droplet diameter on oblique detonations with partially pre-vaporized n-heptane sprays

doi:10.1016/j.combustflame.2023.113062

	Effect of droplet diameter on oblique detonations with partially pre-vaporized n-heptane sprays
	Teng, Honghui; Tian, Cheng; Yang PF(杨鹏飞); Zhao, Majie
通讯作者	Yang, Pengfei(young1505@foxmail.com) ; Zhao, Majie(zhaomj@bit.edu.cn)
发表期刊	COMBUSTION AND FLAME
	2023-12-01
卷号	258 页码:12
ISSN	0010-2180
摘要	Liquid fuels have been widely used in propulsion systems for their higher energy density and easier storage, but there are few studies on oblique detonation engines (ODEs) using the liquid fuels. In this study, oblique detonation waves (ODWs) in partially pre-vaporized n-heptane sprays are simulated, using a hybrid Eulerian-Lagrangian algorithm with a skeletal chemical mechanism, to facilitate liquid fuels applications in ODE. A novel phenomenon has been observed, illustrating that the ODW initiation lengths in pre-vaporized n-heptane sprays firstly increase and then decrease with increasing fuel droplet diameters. It is found out that an increase of droplet diameter can increase the transferred heat amount caused by droplets evaporation and lower the inflow temperature, so leading to the increase of ODW initiation length firstly. However, extremely large droplet diameter can markedly reduce the heat transfer rate of the droplet and its surrounding mixture, and the compressed gas-stream behind oblique shock wave has a higher temperature that accelerate the induction chemical reaction and results in a decrease in the ODW initiation length. Furthermore, the unsteady oscillations of ODW initiation structures are also observed even for a steady inflow, which involves the periodic hot spots, normal detonation waves and their evolutions. Some factors causing the unsteady behavior of ODWs are tested through a sensitivity analysis method of the initiation lengths. Through the analyzation, the fluctuation of the post-shock temperatures is the main factor causing the fluctuation of initiation lengths, revealing that inhomogeneous heat loss by evaporation of dispersed liquid droplets is the main reason causing the unsteady behaviors of ODWs and the competition between heat release by chemical reactions and heat loss by evaporation determines the steadiness of ODWs.(c) 2023 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
关键词	Liquid ODWs Partially pre-vaporized Eulerian-Lagrangian method Droplet diameter
DOI	10.1016/j.combustflame.2023.113062
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:001088095000001
关键词[WOS]	NUMERICAL-SIMULATION ; COMBUSTION ; WAVE ; PROPULSION ; INITIATION ; INJECTION ; CRITERIA ; MODEL
WOS研究方向	Thermodynamics ; Energy & Fuels ; Engineering
WOS类目	Thermodynamics ; Energy & Fuels ; Engineering, Multidisciplinary ; Engineering, Chemical ; Engineering, Mechanical
资助项目	National Natural Science Foundation of China[12325206] ; National Natural Science Foundation of China[12202014] ; National Natural Science Foundation of China[12002041] ; Advanced Jet Propulsion Innovation Center, Aero Engine Academy of China[HKCX2022-01-018]
项目资助者	National Natural Science Foundation of China ; Advanced Jet Propulsion Innovation Center, Aero Engine Academy of China
论文分区	一类/力学重要期刊
力学所作者排名	1
RpAuthor	Yang, Pengfei ; Zhao, Majie
引用统计
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/93232
专题	高温气体动力学国家重点实验室
推荐引用方式 GB/T 7714	Teng, Honghui,Tian, Cheng,Yang PF,et al. Effect of droplet diameter on oblique detonations with partially pre-vaporized n-heptane sprays[J]. COMBUSTION AND FLAME,2023,258:12.
APA	Teng, Honghui,Tian, Cheng,杨鹏飞,&Zhao, Majie.(2023).Effect of droplet diameter on oblique detonations with partially pre-vaporized n-heptane sprays.COMBUSTION AND FLAME,258,12.
MLA	Teng, Honghui,et al."Effect of droplet diameter on oblique detonations with partially pre-vaporized n-heptane sprays".COMBUSTION AND FLAME 258(2023):12.

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