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

doi:10.1016/j.combustflame.2023.113062

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

	Effect of droplet diameter on oblique detonations with partially pre-vaporized n-heptane sprays
	Teng, Honghui 2,3,4; Tian, Cheng 4; Yang, Pengfei 1; Zhao, Majie 3,4
刊名	COMBUSTION AND FLAME
	2023-12-01
卷号	258 页码:12
关键词	Liquid ODWs Partially pre-vaporized Eulerian-Lagrangian method Droplet diameter
ISSN号	0010-2180
DOI	10.1016/j.combustflame.2023.113062
通讯作者	Yang, Pengfei(young1505@foxmail.com) ; Zhao, Majie(zhaomj@bit.edu.cn)
英文摘要	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.
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]
WOS关键词	NUMERICAL-SIMULATION ; COMBUSTION ; WAVE ; PROPULSION ; INITIATION ; INJECTION ; CRITERIA ; MODEL
WOS研究方向	Thermodynamics ; Energy & Fuels ; Engineering
语种	英语
WOS记录号	WOS:001088095000001
资助机构	National Natural Science Foundation of China ; Advanced Jet Propulsion Innovation Center, Aero Engine Academy of China
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/93231]
专题	力学研究所_高温气体动力学国家重点实验室
通讯作者	Yang, Pengfei; Zhao, Majie
作者单位	1.Chinese Acad Sci, State Key Lab High Temp Gas Dynam, Inst Mech, Beijing 100190, Peoples R China 2.Aero Engine Acad China, Adv Jet Prop Innovat Ctr, Beijing 101300, Peoples R China 3.Beijing Inst Technol, Chongqing Innovat Ctr, Chongqing 401120, Peoples R China 4.Beijing Inst Technol, Sch Aerosp Engn, Beijing 100081, Peoples R China
推荐引用方式 GB/T 7714	Teng, Honghui,Tian, Cheng,Yang, Pengfei,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,Yang, Pengfei,&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.