618kW氦氙工质向心透平流场及气动特性研究  

Research on Flow Field and Aerodynamic Characteristics of 618kW Radial Turbine with Helium-xenon Mixture Gas

作　　者：徐森锫 罗磊[1] 杜巍[1] 周逊[1] 王松涛[1] XU Sen-pei;LUO Lei;DU Wei;ZHOU Xun;WANG Song-tao(School of Energy Science and Engineering,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]哈尔滨工业大学能源科学与工程学院,哈尔滨150001

出　　处：《汽轮机技术》2020年第5期351-354,373,共5页Turbine Technology

摘　　要：对某型氦氙工质向心透平进行数值模拟,研究了出口背压、叶顶间隙和叶片数对其气动性能和流场的影响,分析结果表明:随着出口背压的增大,透平输出功率线性下降,效率达到峰值后快速下降;叶顶间隙的增大引起的叶顶泄漏损失增大会降低向心透平的性能,叶顶间隙增加2%时,功率减小了3.3%,流道内存在的泄漏涡和通道涡使得效率下降了3%;叶片数少便于加工,但叶片数过少,导致流场恶化,透平性能明显下降,从10片减至7片,效率下降了1.9%。The numerical simulation of a 618kW radial turbine with helium-xenon working fluid is carried out to study the influence of outlet back pressure,tip clearance and blade number on its aerodynamic performance and flow field.The results show that with the increase of the outlet back pressure,the turbine output power decreases linearly,and the efficiency drops rapidly after reaching the peak.The larger the tip clearance,the greater the tip leakage loss,which will reduce the performance of the radial turbine.When the tip clearance increases to 2%,the power decreases by 3.3%and the efficiency reduces by 3%because of the leakage vortex and channel vortex in the flow channel.The small number of blades is convenient for processing,but the number of blades is so small that the flow field is deteriorated,and the turbine performance is significantly reduced.For instance,the number decreases from 10 to 7,the efficiency falls by 1.9%.

关 键 词：氦氙工质 向心透平 出口背压 叶顶间隙 叶片数 

分 类 号：TK14[动力工程及工程热物理—热能工程]