低温氦气透平膨胀机导向叶栅的数值模拟  

Numerical simulation of flow in the nozzle of cryogenic helium turbo-expander

作　　者：李晓明[1,2] 李健 李青[1] Li Xiaoming;Li Jian;Li Qing(State Key Laboratory of Technology in Space Cryogenic Propellants, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China;University of Chinese Academy of Sciences, Beijing 100049, China;Huazhong University of Science and Technology, Wuhan 430074, China)

机构地区：[1]航天低温推进剂技术国家重点实验室中国科学院理化技术研究所,北京100190 [2]中国科学院大学,北京100049 [3]华中科技大学,武汉430074

出　　处：《低温与超导》2018年第4期1-5,共5页Cryogenics and Superconductivity

基　　金：航天低温推进剂技术国家重点实验室基金课题(SKLTSCP1604)资助

摘　　要：低温氦气透平膨胀机是大型低温氦制冷系统的关键部件,其导向叶栅对整个透平膨胀机的效率有着重要影响。采用计算流体动力学(CFD)软件CFX,运用标准k-!湍流模型,以低温氦气为工质,对所设计的透平膨胀机导向叶栅进行了全流道数值模拟。导向叶栅采用TC系列叶型。对不同叶型,不同叶片数下导向叶栅进行数值模拟。经过计算,得到了TC-2P、TC-3P、TC-4P三种叶型在设计工况下的结果,发现采用TC-2P叶型时,导向叶栅具有较好的性能,同时得到了导向叶栅性能随着叶片数的变化规律。Cryogenic helium turbo - expander is the key component of large cryogenic helium refrigeration system and the nozzle of turbo - expander plays an important role in whole turbo - expander. The full passage nozzle was simulated numerically with the computational fluid dynamics （CFD） software CFX. The standard k -εturbulence model was used and the working gas was cryogenic helium. The TC series blade profile was used in nozzle blades. In addition, the full passage CFD simulations of several nozzles with different numbers of blades and different blade profiles were carried out. After calculation, we got the simula- tion results of TC -2P, TC -3P, TC -4P at design conditions, which TC -2P, TC -3P and TC -4P were three different blade profiles. And it was found that the nozzle with TC -2P blade profile had well aerodynamic performance. And the change rule of nozzle＇ s performance with the blades changing was acquired.

关 键 词：透平膨胀机 导向叶栅 低温系统 氦气 数值计算 

分 类 号：TB657[一般工业技术—制冷工程]