中文摘要：

以25 MW凝气式汽轮机的某级叶片为研究对象,利用ANSYS Workbench平台中的旋转机械分析系统对该级叶片进行了静、动联合三维数值模拟优化.结果表明,优化后叶片压力系数分布较好,降低了叶片表面压差分布,有效控制径向二次流损失;总压损失系数有所减小,平均总压损失系数降低1%;等熵效率由原来的92.099%提高至93.157%.优化后的叶型明显提高了气动性能,降低叶型能量损失,增加了汽轮机效率.

英文摘要：

The three-dimensional numerical simulation and optimization of the last stage of a 25 MW condensable steam turbine are conducted by using ANSYS Workbench,a platform of analysis system specially for the rotating machinery. The results show that the modified blade has a better pressure coefficient distribution,reduces the differential pressure distribution of blade surface,effectively controls the radial secondary flow losses. Total pressure loss coefficient is reduced,and the average total pressure loss coefficient is reduced by 1%. Isentropic efficiency increases from 92. 099 % to 93. 157 %. After optimization,the aerodynamic performance of the blade increases obviously,the energy loss in the blade is reduced and the efficiency of steam turbine increases.