端墙形状对蒸汽涡轮效率的影响(英文)

运用CFD数值计算和平面叶栅的吹风试验对蒸汽涡轮导向叶片的端墙效应进行了研究,并在一试验蒸汽涡轮上得到了验证。由于本文研究给出了较高的效率,进一步实施了大量的三维数值模拟,该结果显示使用这一叶型对涡轮有一定的改善,尤其在涡轮叶片尖部有端墙时。在试验蒸汽涡轮上测量了尖部、根部均有端墙和仅尖部有端墙的不同效应,结果表明尖部有端墙时效率有所提高,然而当叶片有直端墙时,效率反而会下降。

EFFECTS OF END-WALL SHAPING ON STEAM TURBINE EFFICIENCY

The end-wall shaping effects of the guide blade in the steam turbine stages are studied. The research of the end-wall shaping effects on turbine efficiency applies CFD numerical simulations and the measurement of straight blade cascades in the wind tunnel. The final stage of research activities includes the experimental verification of the findings in an experimental steam turbine. As the findings are interesting in terms of efficiency, a series of 3-D numerical simulations are executed. These demonstrate the certain improvement when the shaping is used, especially in the blade tip area. The steam turbine is used to measure the shaping effects on both sides (bilateral shaping) as well as only in the blade tip area. The process indicates the efficiency improvement on the blade tip shaping. However, this occurs only in partial admission. On the other hand, there is a drop in efficiency compared with blades with straight end-walls.