低压涡轮导向叶片尾缘切除将增加导向器排气面积，可作为调控流通能力的便捷手段。本文选取某低压涡轮导向叶片中截面叶型作为研究对象，采用数值模拟的方法研究了尾缘切除对低压涡轮叶栅气动性能的影响，文中研究了切除长度分别为2.5%、5.0%、7.5%弦长时叶栅气动性能的变化情况，并且采用尖边倒圆、将尾缘修整为圆弧形、椭圆形三种方式对切尾缘后叶型剩余尾部进行修型。结果表明：尾缘切除可有效增加叶栅槽道的流通能力，并且流通能力随尾缘切除长度增加而增加。切尾缘后叶栅损失增大，并且与尾缘切除长度呈正相关。切尾缘后的修型方式也会对叶栅损失水平产生影响，将尾缘修整为椭圆形对损失抑制效果最明显，在同样切除长度下其尾迹损失和端区损失均低于另两种修型方式。尾缘切除对叶栅出口气流角影响微弱，尾缘切除长度每增加1%弦长，采用三种修型方式叶栅出口气流角增加量为0.13°～0.16°。

Cutting-off the trailing edge on the guide vanes increase the exhaust area of low pressure turbine (LPT) guider. It’s a convenient method to increase flow capacity of LPT. Numerical simulation was used to study effects of cutting-off trailing edge on aerodynamic performance of LPT cascade. The aerodynamic performance variation of cutting-off trailing edge for 2.5%,5% and 7.5% chord was displayed. And three different modifying shape methods were used after cutting-off trailing edge. Result shows: Cutting-off trailing edge can increase flow capacity of the passage in cascade. Flow capacity and flow loss are positively associated with the length of cutting-off trailing edge. Methods of modifying shape can affect loss of the cascade. Modifying the shape of profile tail to ellipse has most effect on decreasing cutting loss. It can reduce end-wall loss and wake loss at same time. Cutting-off trailing edge has a weak influence on the exhaust flow angle of cascade. Different modifying shape methods cause the positive variations of cascade exhaust flow angle form 0.13° to 0.16° while cutting-off length increase for 1% chord.