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| 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 |
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Abstract 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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Received: 28 December 2016
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