Development of Erosion Test Methods on Underexpanded Inert-Gas Impinging Jets Injected in Liquid Sodium
工藤 秀行 Hideyuki KUDOH 太田 淳己 Junki OHTA 杉山 憲一郎 Ken-ichiro SUGIYAMA 奈良林 直 Tadashi NARABAYASHI 大島 宏之 Hiroyuki OHSHIMA 栗原 成計 Akikazu KURIHARA
Erosion Liquid Droplet Impingement Liquid-Sodium Droplet Sodium-Cooled Fast Reactor Sodium-Water Reaction Steam Generator Underexpanded Supersonic-Jet Visualization
When a heat transfer tube wall in a steam generator of a sodium-cooled fast reactor fails, high-pressure steam leaks into low-pressure liquid sodium side. Then the high-temperature and highly corrosive reaction jet causes secondary failures of neighboring heat transfer tubes. The objective of the present study is to develop an experimental method to obtain data that is necessary to validate and improve a safety evaluation code on the sodium?water reaction. In the present paper, the methods of sodium?droplet erosion test at the position of the local structure in underexpanded inert-gas impinging jets using the visualization method, which was developed in our previous study, were reported. The erosion phenomena observed in the sodium?droplet entrained region, where intensive erosion is expected, were found to be discussed using the existing knowledge of liquid droplet impingement (LDI) obtained in water experiments.