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对Aachen透平第一级动叶栅添加倒角结构,应用全三维黏性数值模拟方法,分析了级环境下动叶栅倒角对透平级性能和内部流场的影响.结果表明:过小的倒圆夹角会明显降低透平级效率,在叶栅加工中应给予足够重视;倒角结构降低了动叶根、顶处横向压差,气动负荷向动叶栅后半部分转移;动叶根部和顶部倒角对流场的影响主要分布于0%~55%和70%~100%叶高范围内,受倒角影响上、下通道涡向叶栅中部靠近,端壁处角涡强度增大,次流损失上升.
The chamfer structure of the first stage cascade of Aachen turbine was added and the effect of the chamfer of cascade on the performance of the turbine stage and the internal flow field was analyzed by the full three-dimensional viscous numerical simulation method. Small rounding angle will obviously reduce the efficiency of the turbine stage, which should be given enough attention in the machining of cascades. The chamfering structure reduces the pressure drop at the root and the top of the moving blade, and the aerodynamic load shifts to the rear half of the moving blade. The influence of the root and top chamfering on the flow field is mainly distributed in the range of 0% -55% and 70% -100%, which is affected by chamfering. The eddy strength increases and the secondary loss increases.