基于二次流控制的叶栅前缘端壁造型

Design of Endwall in the Leading Edge based on the Control of Secondary Flow

基于Langston叶型的数值模拟结果,分析了叶栅前缘端区的流动特征,建立并优化了一种新型端壁造型。对比评估了新模型与原始模型的流动现象并对两者的流动机理进行分析。结果表明:新型端壁造型能够疏导前缘位置的低能流体并消除鞍点与分离线的产生;新型端壁造型能够减小马蹄涡及下游的通道涡强度,并使得叶栅出口总压损失系数下降6.831%。

Based on the numerical simulation results of the Langston csacade,the flow characteristics of the leading edge region of the cascade are analyzed.A new type endwall design method is established and the design is then optimized.The flow phenomena of the new model and the original model are compared and analyzed,and the flow mechanism of the two models is analyzed.The results show that the new endwall model can dredge the low-energy fluid at the leading edge and eliminate the saddle point and the separation line.The new endwall model can reduce the strength of the horseshoe vortex and the passage vortex.The total pressure loss coefficient of the exit position is also reduced by 6.831%.