级环境下弯叶片对涡轮气动性能影响数值研究

针对某两级低压涡轮的弯扭叶片进行气动性能影响的数值研究,通过对比分析不同弯角和不同类型弯叶片的流场,认为级环境下弯叶片需根据具体载荷分布条件匹配设计.对于研究两级涡轮,第一级静叶反弯、第二级静叶正弯具有相对最优的气动绝热效率,J型弯相比对称弯改善负荷分配,降低二次流损失和激波损失,且小弯角叶片表面压力分布更均匀,流道中部熵增更小,性能高于大弯角叶片. 

Numerical investigation on the effect of bowed blade to aerodynamic performance of low pressure turbine under stage condition

The numerical investigation on the effect of bowed blade to the aerodynamic performance of a two-stage low pressure turbine was presented.By analyzing the flow field of the bowed blade of different bowed-angle and bowed-type,the result is:under the stage circumstances,bowed blade design should match the real load condition;for target turbine,the first stage stator with positive bowed type and the second stage stator with negative bowed type have the best aerodynamic performance;compared to the symmetry bowed blade,J bowed type improves load distribution of the stage and reduces the secondary flow loss and shock wave loss;further more,the blade with small bowed-angle which has better pressure distribution and less entropy production of the mid-flow passage is superior to the big one.