用于900W/4.5K氦低温测试系统的低温喷射器设计  

Design of Cold Ejector for 900 W /4. 5 K Cryogenic System

作　　者：倪清[1] 毕延芳[1] 冯汉升[1] 康帅[1] 

机构地区：[1]中国科学院等离子体物理研究所,合肥230031

出　　处：《真空科学与技术学报》2013年第9期948-953,共6页Chinese Journal of Vacuum Science and Technology

摘　　要：低温喷射器在900 W/4.5 K氦低温测试系统分配阀箱中的应用主要功能是过冷超临界氦,通过高压低速的超临界氦流在喷管中形成的低压高速的喷射流体引射过冷槽中的氦蒸气,从而达到过冷槽的减压降温,其作用相当于抽气泵。本文对该低温喷射器的工作环境及流程进行了说明,分析了喷射器工作流体在设计工况下的可达喷射系数及其影响,工作流体压力及流量变化情况下喷射器的工况变化,最后对试验件进行了结构设计。Here, we addressed the development of the cold ejector used for sub-cooling supercritical helium, a key component in the cryogenic distribution box of the 900 W/4.5 K cryogenic System, which is a sub-project of the interna- tional thermal nuclear experimental reactor. The jet coefficient of the cold ejector under the realistic operating conditions was physically modeled, analytically approximated and calculated. The interdependence of the pressure, mass flow rate of the working fluid, structures of the ejector, and jet coefficient was theoretically evaluated. The prototyped cold ejector was designed, constructed, and to be tested. The preliminary results show that the jet coefficient can be up to 1.15 under the required working conditions. The cold ejector remains to be improved and optimized by experimental study.

关 键 词：低温系统 过冷槽 喷射器 分配阀箱 

分 类 号：TB661[一般工业技术—制冷工程] TB79