喷嘴角度对水银扩散泵抽气性能影响的DSMC模拟研究  

DSMC Simulation Study of Influence of Nozzle Angle on Pumping Performance of Mercury Diffusion Pump

作　　者：赵长莲 毛世峰[1] 刘鹏 覃世军 余羿[1] 叶民友[1] ZHAO Chang-lian;MAO Shi-feng;LIU Peng;QIN Shi-jun;YU Yi;YE Min-you(Department of Engineering and Applied Physics,University of Science and Technology of China,Hefei 230027,China;Institute of Plasma Physics,Chinese Academy of Sciences,Hefei 230031,China)

机构地区：[1]中国科学技术大学工程与应用物理系,安徽合肥230027 [2]中国科学院等离子体物理研究所,安徽合肥230031

出　　处：《真空》2020年第2期8-12,共5页Vacuum

基　　金：国家重点研发计划(2017YFE0301501);合肥物质科学技术中心创新项目培育基金(2016FXCX009)。

摘　　要：扩散泵由于其大抽速、连续稳态工作的优点,有望应用于未来聚变堆的偏滤器抽气系统中,以降低目前托卡马克装置中广泛采用的捕集式低温泵所带来的高氚存储量问题。由于氚相容性的限制,目前的商业油扩散泵无法直接应用于聚变堆中,水银将是理想的扩散泵工作介质。为了支持未来聚变堆偏滤器抽气系统的水银扩散泵设计,需要针对水银扩散泵开展设计优化研究。本文采用直接模拟蒙特卡洛方法,基于KT-150扩散泵结构,研究了喷嘴角度对水银扩散泵的抽气速度及水银返流率的影响。结果表明喷嘴角度为45°时能够达到最佳的抽气速度1.53m^3/s,同时返流率没有显著提升。Due to the high pumping speed and continuous steady state operation,the diffusion pump is expected to be applied in the divertor pumping system in future fusion reactor to reduce the high tritium inventory in the cryogenic pump,which are widely used in present tokamaks.Because the requirement of compatibility with tritium,the commercial oil diffusion pump can not be directly applied in the fusion reactor.Instead,the mercury will be the ideal working fluid.For the purpose to support the mercury diffusion pump design in the divertor pumping system of future fusion reactor,the optimization study of the mercury diffusion pump design is necessary.In this work,using the direct simulation Monte Carlo(DSMC)method,influence of the nozzle angle on the pumping speed and mercury backstreaming rate are simulated based on a KT-150 diffusion pump structure.The simulation results show that the largest pumping speed of^1.53 m^3/s is achieved when nozzle angle equals 45 degrees,while the backstreaming rate is not obviously increased.

关 键 词：偏滤器抽气 直接模拟蒙特卡洛方法 水银扩散泵 抽速 返流率 

分 类 号：TB752.3[一般工业技术—真空技术]