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

文献类型：期刊论文

作者Teng, Honghui2,3,4; Tian, Cheng4; Yang, Pengfei1; Zhao, Majie3,4; Yang PF(杨鹏飞)
刊名COMBUSTION AND FLAME
出版日期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
DOI10.1016/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.
WOS关键词NUMERICAL-SIMULATION ; COMBUSTION ; WAVE ; PROPULSION ; INITIATION ; INJECTION ; CRITERIA ; MODEL
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
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,&杨鹏飞.(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.

入库方式： OAI收割

来源：力学研究所

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