为探究以氦气作为闭式布雷顿循环动力系统工质的涡轮特性，基于氦气与空气的物性差异对损失模型进行修正，绘制涡轮特性曲线，构建一种特殊工质轴流透平一维特性快速预估方法，并通过三维仿真进行验证。研究表明：对损失模型进行修正后，一维预估得到的特性参数更加接近CFD计算结果；在设计点工况下，总温比的误差由0.53%降为0.42%，等熵效率的误差由7.8%降为0.23%；在非设计工况（50%，70%，100%设计转速）下，特性预估结果也较为准确。该方法可实现氦气涡轮特性快速预估，减少计算量。

In order to explore the turbine characteristics of a closedloop Brayton cycle power system with helium as working fluid,the loss model was modified based on the physical properties difference between helium and air,and the turbine characteristic curve was drawn.A rapid prediction method for onedimensional characteristics of axial flow turbine with special working fluid was constructed and verified by threedimensional simulation.The results show that after modifying the loss model,the characteristic parameters obtained by onedimensional prediction are closer to the computational fluid dynamics (CFD) calculation results; at the design point,the error of the total temperature ratio is reduced from 0.53% to 0.42%,and the error of the isentropic efficiency is reduced from 7.8% to 0.23%; at offdesign conditions under 50%,70% and 100% of design speeds,the characteristic prediction results are also more accurate.This method can realize the rapid prediction of helium turbine characteristics and reduce the amount of calculation.

TK14

国家科技重大专项（2019-I-0007-0007）