Pressure fluctuation in vaneless space of pump turbine with Misaligned Guide Vanes
LI Qifei1,2, ZHANG Zhen1*, LI Rennian1,2, Song Qice1, Zhang Jianxun1
1.College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2. State Key Laboratory of Gansu Fluid Machinery and Systems, Lanzhou University of Technology, Lanzhou, Gansu 730050, China
In order to study the characteristics of pressure fluctuation at low load of pump turbine with the Misaligned Guide Vanes(MGV)in the vaneless space, the model pump turbine of a pumped storage power station served as the research object. Based on the detached eddy simulation method, we studied the flow in the vaneless space and analyed the influence of pre-opened guide vanes on the flow, besides a pump turbine with pre-opened guide vanes with angle 24° and 33° was modeled, and four MGVs were designed, in the hope of finding the most optimal solution to the vibration of the pump turbine at low load through fully three-dimensional numerical simulation of flow. The analysis results of the four pre-opening programs show that a region at the wake of pre-opened guide vanes and close to the pressure side of blade has a larger pressure amplitude. And equally-distributed guide vanes are better than centrally-distributed ones in improving pressure amplitude. It is concluded that the program of 7#,8# and 17#,18# two-pair guide vanes can most effectively mitigate the pump turbine vibration.
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