Numerical analysis of supersonic jet flow and dust transport induced by air ingress in a fusion reactor

doi:10.1007/s41365-021-00912-z

	Numerical analysis of supersonic jet flow and dust transport induced by air ingress in a fusion reactor
	Wang, Bu-Er 1,2; Zhang, Shi-Chao 1; Wang, Zhen 1; Jia, Jiang-Tao 1; Chen, Zhi-Bin 1
刊名	NUCLEAR SCIENCE AND TECHNIQUES
	2021-07-01
卷号	32
关键词	Supersonic jet Radioactive dust Loss of vacuum accident Mach disk Friction velocity
ISSN号	1001-8042
DOI	10.1007/s41365-021-00912-z
通讯作者	Zhang, Shi-Chao(shichao.zhang@inest.cas.cn) ; Wang, Zhen(zhen.wang@inest.cas.cn)
英文摘要	During a loss of vacuum accident (LOVA), the air ingress into a vacuum vessel (VV) may lead to radioactive dust resuspension, migration, and even explosion, thereby posing a great threat to the safe operation of future fusion reactors; thus, it is crucial to understand the flow characteristics and radioactive dust transport behavior induced by LOVA. However, only a few studies have identified the characteristics of the highly under-expanded jet flow at a scale of milliseconds during LOVA. Particularly, the occurrence and behavior of a Mach disk is yet to be captured in existing studies. In this study, we used a more advanced model with a finer mesh and adaptive mesh strategies to capture the Mach disk in a VV during LOVA. In detail, a computational fluid dynamics-discrete phase model one-way coupled multiphase approach was established using the computational fluid dynamics code ANSYS FLUENT and applied to the analysis during the first seconds of LOVA. The results showed that air ingress into the VV behaved like a highly free under-expanded jet at the initial stage and Mach disk was formed at similar to 6 ms. Moreover, the flow field dramatically changed at the position of the Mach disk. The jet core before the Mach disk had a maximum velocity of similar to 8 Mach with the corresponding lowest static pressure (similar to 100 Pa) and temperature (few tens of K). The friction velocities in the lower part of the VV, which is an area of concern due to dust deposition, were generally larger than 15 m/s near the inlet region. Lastly, the crude prediction of the particle trajectories demonstrated the spiral trajectories of the dust following the air motion. Therefore, this study provided a basis for further safety analysis and accident prevention related to dust transport and explosion in future fusion reactors.
资助项目	National Natural Science Foundation of China[51906249] ; National Key R&D Program of China[2019YFE0191600] ; President Foundation of Hefei Institute of Physical Science, Chinese Academy of Sciences[YZJJ2019QN21]
WOS关键词	VACUUM ACCIDENT ; RESUSPENSION ; DEVICES ; FIELD ; LOVA
WOS研究方向	Nuclear Science & Technology ; Physics
语种	英语
出版者	SPRINGER SINGAPORE PTE LTD
WOS记录号	WOS:000673983000001
资助机构	National Natural Science Foundation of China ; National Key R&D Program of China ; President Foundation of Hefei Institute of Physical Science, Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/123275]
专题	中国科学院合肥物质科学研究院
通讯作者	Zhang, Shi-Chao; Wang, Zhen
作者单位	1.Chinese Acad Sci, Hefei Inst Phys Sci, Inst Nucl Energy Safety Technol, Hefei 230031, Peoples R China 2.Univ Sci & Technol China, Hefei 230026, Peoples R China
推荐引用方式 GB/T 7714	Wang, Bu-Er,Zhang, Shi-Chao,Wang, Zhen,et al. Numerical analysis of supersonic jet flow and dust transport induced by air ingress in a fusion reactor[J]. NUCLEAR SCIENCE AND TECHNIQUES,2021,32.
APA	Wang, Bu-Er,Zhang, Shi-Chao,Wang, Zhen,Jia, Jiang-Tao,&Chen, Zhi-Bin.(2021).Numerical analysis of supersonic jet flow and dust transport induced by air ingress in a fusion reactor.NUCLEAR SCIENCE AND TECHNIQUES,32.
MLA	Wang, Bu-Er,et al."Numerical analysis of supersonic jet flow and dust transport induced by air ingress in a fusion reactor".NUCLEAR SCIENCE AND TECHNIQUES 32(2021).