The effect of trailing edge removal on the aerodynamic performance of low-pressure turbine cascade
Selecting the cross-sectional blade profile of a cer-tain low pressure turbine(LPT)guide blade as the research object,numerical simulation methods were used to study the effect of trailing edge cutting on the aerodynamic performance of low-pressure turbine cascades.The changes in the aerody-namic performance of the cascades were studied when the cut-ting lengths were 2.5％,5.0％,and 7.5％chord lengths re-spectively.The remaining tail of the blade profile after cutting the trailing edge was modified by using three methods as sharp edge rounding,trimming the trailing edge to a circular and el-liptical shape.The results show that trailing edge removal can effectively increase the flow capacity of blade cascade chan-nel,and the flow capacity increases with the length of trailing edge removal.After cutting the trailing edge,the blade loss increases and is positively correlated with the length of the trailing edge cut.The trimming method after trimming the trai-ling edge will have an impact on the level of blade cascade loss.Trimming the trailing edge to an elliptical shape has the most significant loss suppression effect.Under the same trim-ming length,the wake loss and end zone loss are lower than the other two trimming methods.The effect of trailing edge re-moval on the outlet airflow angle of the blade cascade is weak,and for every 1％increase in the chord length of trailing re-moval,the three modification methods increase the outlet air-flow angle of the blade cascade by 0.13° to 0.16°.
万方数据
维普
