The influence of a bilateral flare of the flow path of the turbine nozzle vane on the flow pattern and energy losses was investigated, a search was made for ways to improve the aerodynamic performance of a such kind of units. According to viscous flow calculations, the bilateral flared flow path affects the airfoil loading along the whole height of the vane, increasing velocities on both sides of the airfoil and the intensity of diffusion at divergent flow zones. The positive tip overlap considerably decreases energy losses in the vane.

中文翻译：

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带有扩口流道的涡轮叶片行的空气动力学研究

研究了涡轮喷嘴叶片的流道的双向扩口对流型和能量损失的影响，并研究了改善此类机组空气动力学性能的方法。根据粘性流计算，双向扩口流路会影响叶片整个高度上的翼型负载，从而增加翼型两侧的速度以及发散流动区域的扩散强度。正尖端重叠大大减少了叶片中的能量损失。