650MHz双cell超导腔冷氦气降温过程的非稳态数值计算  

Unsteady numerical simulation on cold helium cooling scheme of 650MHz double-cell superconducting cavity

作　　者：李梅[1,2,3] 常正则[1,2,3] 李少鹏 葛锐[1,2,3] Li Mei;Chang Zhengze;Li Shaopeng;Ge Rui(Institution of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;Key Laboratory of Partical Acceleration Physics & Technology, Chinese Academy of Sciences, Beijing 100049, China;Center for Superconducting RF and Cryogenics, Institution of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China)

机构地区：[1]中国科学院高能物理研究所,北京100049 [2]中国科学院粒子加速物理与技术重点实验室,北京100049 [3]中国科学院高能物理研究所射频超导与低温研究中心,北京100049

出　　处：《低温工程》2019年第5期1-9,共9页Cryogenics

基　　金：国家自然科学基金资助(No.11905230)

摘　　要：以650 MHz双cell超导腔为研究对象,分析超导腔在降温过程中的温度分布情况和降温规律,建立了三维流热耦合模型,并对不同入口温度、流量的工况进行了非稳态数值仿真研究,得到了650 MHz双cell超导腔壁面在降温过程中的等效对流换热系数、温度分布情况等,并分析了时间项、入口参数等对降温过程的影响规律。结果表明:超导腔在降温过程中的温度分布呈中间低两侧高的规律,最大温差和残余温差随入口温度的降低而增加。对应300 K初始温度,当入口温度从290 K降至270 K时,最大温差和一小时后的残余温差分别增长了180%和130%。另外最大温差随入口流量的增长而增长,残余温差则随入口流量的增长而降低。In this paper, 650 MHz double cell superconducting cavity was taken as the research object. The temperature distribution and cooling law of the superconducting cavity during cooling process were analyzed. A three-dimensional coupled flow-heat model was established. The unsteady numerical simulation of different inlet temperature, flow rate and pressure conditions was carried out. The equivalent convective heat transfer coefficient and temperature distribution of 650 MHz double-cell superconducting cavity during cooling process were obtained. The effects of cooling time and entrance parameters on the cooling process were analyzed. The results show that the temperature distribution of the superconducting cavity in the cooling process is low in the middle section and high on both sides. The maximum temperature difference and residual temperature difference increase with the decrease of the inlet temperature. Corresponding to the initial temperature of 300 K, when the inlet temperature drops from 290 K to 270 K, the maximum temperature difference increases by 180% and the residual temperature difference increases by 130% after one hour, respectively. In addition, the maximum temperature difference increases with the increase of the inlet flow rate, while the residual temperature difference decreases with the increase of the inlet flow rate.

关 键 词：加速器 超导腔 氦气 降温 仿真计算 

分 类 号：TL53[核科学技术—核技术及应用] TB66[一般工业技术—制冷工程]