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

• 作者: Bu-Er Wang Shi-Chao Zhang Zhen Wang Jiang-Tao Jia Zhi-Bin Chen
• 来源期刊: 核技术（英文版）
• 年，卷（期）: 2021,（7）
• 所属期刊栏目: NUCLEAR ENERGY SCIENCE AND ENGINEERING
• 页码范围: 72-82
• 页数: 11页
• 语种: 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 explo-sion,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.Particu-larly,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 estab-lished 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