低压两级涡轮叶片修缘对涡轮效率影响研究

Study of the influence of blade edge modification of low-pressure two staged turbine on the turbine efficiency

运用三维数值模拟技术,对一个多级轴流空气涡轮的低压两级原型4排叶片进行了数值计算和流场分析。然后分别对低压一、二级前缘和尾缘进行修缘的修缘叶片两级涡轮进行数值计算,并与原型叶片的计算结果进行比较,确定其对低压涡轮效率的影响。计算结果表明:采用修缘叶片的涡轮效率均小于原型叶片的效率,涡轮效率随着修缘量的增大逐渐降低。

By the use of 3 D numeric simulation technique, the numerical calculation and flow field analysis on four row blades of the low-pressurc two staged prototype of multiple Staged axial flow aero-turbine were carried out. And then the numerical calculations were carried through respectively on the blade edges modified two staged turbine with its front and trail blades edges being modified in its low pressure first stage and second stage. By comparing with the computed result of prototype blades its influence on the efficiency of low pressure turbine was determined. The calculation result showed that the efficiencies of turbines that adopted modified blades edges were all less than those of the turbines with the prototype blades and the efficiency of turbine would gradually drop down along with the augmentation of the amount of edge modification.