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| Numerical prediction of flow in Francis turbine with long and short blades |
| Ma Yue1, Zhang Haiku2, Liu Demin3, Liu Xiaobing4 |
| 1.Guodian Power Development in Dadu River Overhaul and Installation Co. Ltd., Leshan, Sichuan 614900, China; 2.Sichuan Electric Power Industry Commission & Test Institute, Chengdu, Sichuan 610072, China; 3.Dongfang Electric Corporation, Chengdu, Sichuan 611731, China; 4.School of Energy and Environment, Xihua University, Chengdu, Sichuan 610039, China |
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Abstract The 3D turbulent flow in HLA542-LJ-130 turbine runner under the typical small flow rate condition was simulated in CFX by solving the 3D N-S equation with SST turbulent model. The flow information in various flow passage components was obtained. The calculation results show that the pressure reduces uniformly from the volute inlet to the outlet of the guide vane, while the velocity vector increases uniformly. In addition, the symmetry of velocity and pressure distributions on the circumferential direction is good. The pressure reduces uniformly on the long and short blades from the inlet edge to the outlet edge of the blade, and the pressure distribution is relatively reasonable. There is no obvious recirculation and secondary flow on the working surface of the blade. The streamline distribution is smooth, and the pressure and velocity distributions on the inlet of the draft tube are basically symmetrical, while the pressure is uniformly distributed along the radial direction. There are vortexes in the straight taper section of the draft tube which has the same rotation direction with the runner. These vortexes develop to the end of the draft tube without obvious eccentricity, and they are weakened in the diffuser section. This study has important guiding significance for the selection and design of turbines in high-head hydropower stations.
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Received: 22 October 2012
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