Pump-turbine runner design and flow simulation based on inverse design method
Yang Guoying1,2, Feng Chenran3
1.School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2.Students′ Affairs Division, Lanzhou Petrochemical College of Vocational Technology, Lanzhou, Gansu 730060, China; 2.School of Petrochemical Technology, Lanzhou University of Technology, Lanzhou, Gansu 730050, China
Abstract：As pump-turbines are usually subject to a poorer efficiency, through drawing lessons from the blade design principle for low specific speed Francis turbines, the blades in a pump-turbine runner were designed by using inverse design method under given design duty parameters, and then 3D modeling and ICEM meshing were carried out. The flow field in the pump-turbine was simulated and the flow characteristics were identified by solving the RNG k-ε turbulence model and N-S equations in the relative coordinate system. The finite volume method was used to discrete fluid domain and SIMPLEC algorithm was applied to couple the N-S equations. The efficiency of the pump-turbine was predicted as well. A comparison of predicted and experimental pressure distribution has been conducted. The numerical results show that the best efficiency can reach as high as 91% with turbine mode and 82% with pump mode, respectively. This demonstrates that the inverse design method can take both pump and turbine modes into account in hydraulic design to make a pump-turbine be operated in a relatively optimal condition.
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