Abstract：The 2D slip physical hydraulic model and axisymmetric numerical models were applied to investigate the wake flow direction of the vertical pipe inlet/outlet outflow. The results of the 2D model experiment and the axisymmetric numerical simulations showed that the outflow of vertical pipe with the cover plate performed as jet flow, and the direction of wake flow changed with the water level. The wake flow would shift to the surface layer when the water depth was small and it would turn to the bed when the water depth was high.The 3D model experiment showed that the outflow head loss coefficient was 0.61 with an antiswirl plate mounted above vertical inlet/outlet,and the factors were about 0.44～0.48 for other types of structures of statewide antiswirl beam,flat antiswirl beam or non antiswirl beam.The inflow head loss factors were about 0.4 for all types of intakes.The model experiment results also suggested that it was able to provide uniformity flow with pipe diffuse angle of less than 9°. An individual big spiral vortex appeared above the inlet structure during the inflow model experiment under the conditions of high water level. As the water level went down, the big spiral vortex would collapse into several small ones, and the number of spiral vortexes was same as the number of the guide walls.When two intakes were working at the same time,spiral vortexes would interact,one was dextrorotatory and another was levorotatory.
程伟平, 胡云进, 章军军, 毛根海. 竖井式抽水蓄能电站进/出水口的水力特征[J]. 排灌机械工程学报, 2010, 28(6): 537-542.
Cheng Weiping, Hu Yunjin, Zhang Junjun, Mao Genhai. Study on hydraulic characteristics of vertical pipe inlet/outlet of pumped storage plants. Journal of Drainage and Irrigation Machinery Engin, 2010, 28(6): 537-542.
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