文献类型：期刊文献

英文题名：Experimental study on temperature fluctuations on plate surface induced by coaxial-jet flow

作者：Xiong, Xue-Yao[1];Liu, Zun-Quan[1];Zhou, Guo-Yan[1];Luo, Xing[2];Tu, Shan-Tung[1]

机构：[1]East China Univ Sci & Technol, Key Lab Pressure Syst & Safety MOE, Shanghai 200237, Peoples R China;[2]Gottfried Wilhelm Leibniz Univ Hannover, Inst Thermodynam, D-30823 Garbsen, Germany

年份：2024

卷号：35

期号：5

外文期刊名：NUCLEAR SCIENCE AND TECHNIQUES

收录：;EI(收录号：20241515903206);WOS:【SCI-EXPANDED(收录号:WOS:001199419500007)】；

基金：This work was supported by the National Natural Science Foundation of China (No. 52075173) and the Overseas Expertise Introduction Project for Discipline Innovation (No. B13020).

语种：英文

外文关键词：Temperature fluctuation; Thermal striping; Coaxial jet; Thermal mixing; The upper plenum of nuclear reactor

摘要：In nuclear reactors, temperature fluctuations of fluids may cause fatigue damage to adjacent structures; this is referred to as thermal striping. Research on thermal striping in the upper plenum has mainly focused on fluid fields. Few experimental studies have been reported on solid structures in a fluid field with a coaxial jet. This study entailed an experimental study of the temperature fluctuations in the fluid and on a plate surface caused by a coaxial jet. The temperature fluctuations of the fluid and plate surfaces located at different heights were analyzed. The cause of the temperature fluctuation was analyzed using a transient temperature distribution. The results show that the mixing of the hot and cold fluids gradually becomes uniform in the positive axial direction. The average surface temperatures tended to be consistent. When the jet reaches the plate surface, the swing of the jet center, contraction and expansion of the cold jet, and changes in the jet shape result in temperature fluctuations. The intensity of the temperature fluctuation was affected by the position. More attention should be paid when the plate is located at a lower height, and between the hot and cold-fluid nozzles.