氢透平膨胀机叶栅流场数值模拟与试验验证  

Numerical simulation and experimental verification of cascade flow field in hydrogen turbine expander

作　　者：李中[1] 刘玉涛[1] 段娜[1] 周凯淼 Li Zhong;Liu Yutao;Duan Na;Zhou Kaimiao(Beijing institute of Aerospace Test Technology, Beijing 100074, China)

机构地区：[1]北京航天试验技术研究所,北京100074

出　　处：《低温工程》2020年第5期19-24,64,共7页Cryogenics

摘　　要：叶栅作为氢透平膨胀机能量转化的核心部件,其工作效率对膨胀机至关重要,调用SST湍流模型,针对实际气体性质的氢气参数开展了数值模拟,分析叶栅的内部流动规律及其二次流能量损失机理,结果表明叶栅上下端壁的能量损失呈对称分布,叶栅的前缘能量损失较小,喉部以及尾缘能量损失较大,叶栅的吸力面发现比较严重的流体流动集中现象,尾缘处存在尾迹涡。同时,开展试验对数值模拟的可靠性进行验证,通过截取实际叶栅的两个流道设计了试验系统,在不同入口压力下通入氢气开展试验,通过测量试验模型进出口温度和压力将其作为数值模拟的边界条件开展数值模拟,拟合试验和数值模拟的出口温度进行分析,发现试验值和模拟值的发展趋势一致。As the core component of the energy conversion of the hydrogen turbine expander,its working efficiency is very important to the expander.In this paper,the SST Turbulence model is used to simulate the hydrogen parameters of the actual gas properties.The internal flow law and the energy loss mechanism of the secondary flow are analyzed.The results show that the energy loss of the upper and lower walls of the cascade is symmetrical distribution,the energy loss of the leading edge of the cascade is small,the energy loss of the throat and the trailing edge is large,and the suction surface of the cascade is found to be more serious There are wake vortices at the trailing edge.At the same time,experiments have been carried out to verify the reliability of numerical simulation.A test system has been designed through intercepting two passages of the actual cascade and conduct experiments has been conducted with hydrogen under different inlet pressures.The boundary conditions of numerical simulation were determined through measuring the inlet and outlet temperature and pressure of the test model.The outlet temperatures obtained by fitting test and numerical simulation were anylyzed and it is found that the development trend of test value and simulation value is consistent,which proves that the simulation model and calculation method adopted in this paper have high reliability.

关 键 词：氢透平膨胀机 叶栅 二次流 数值模拟 试验验证 

分 类 号：TB657.3[一般工业技术—制冷工程]