摘要
针对某液化装置用一级透平膨胀机进行一维热力参数设计计算并使用商业软件ANSYS进行三维数值模拟的校核。计算表明,一维设计所得结果具有一定准确性。三维校核过程中,分别使用理想气体、PR方程以及He Pak三种不同的氦气体工质物性库,三者对工质密度计算的数据存在较大差别,且压力越大差别越大;喷嘴叶片表面压力分布差别较小,温度分布差别较大;工作轮叶片表面压力分布在前缘处有一定差别,尾缘处变化曲线基本重合,温度分布同样差别较大。此次模拟校核表明,理想气体物性库与实际气体物性库的结果存在一定偏差,故对于小型低温透平膨胀机而言,即便温区在20K以上,也应使用实际气体物性库对其进行数值模拟。
The one - dimensional thermodynamic parameters of a liquefied plant expander were calculated, and commercial software ANSYS was used for three -dimensional numerical simulation correction in this paper. The results obtained by 1D design method were certain accuracy. In the three - dimensional verification process, the ideal gas, PR equation and Hepak helium gas working -fluid property library were used, and there was a big among the data calculated by the three on the density of the working - fluid, the greater the pressure, the greater the difference. The surface pressure distribution of the nozzle blade has no significant difference, while the temperature distribution has obvious distinction. It is also found that the surface pressure distri- bution of the impeller is different in leading edge, the pressure change curve of trailing - edge is basically coincident, and the temperature distribution also has distinction. The simulation results show that there is a certain difference between the ideal gas and the real gas, so for small cryogenic turbo - expander, even if the temperature is higher than 20 K, the actual working - fluid property library shall be used for numerical simulation.
作者
柯长磊
熊联友
彭楠
李空荣
刘立强
Ke Changlei;Xiong Lianyou;Peng Nan;Li Kongrong;Liu Liqiang(State Key Laboratory of Technologies in Space Cryogenic propellants,Technical Institute of Physics and Chemistry,Chinese Academy of Science,Beijing 100190,China;University of Chinese Academy of Science,Beijing 100049,China)
出处
《低温与超导》
CAS
北大核心
2018年第11期20-25,共6页
Cryogenics and Superconductivity
关键词
小型低温透平
一维热力计算
实际气体
数值模拟
Small cryogenic turbine
1D thermodynamic calculation
Real gas
Numerical simulation
