Numerical Investigation on Performance Improvement by Using a Runner with Splitter for a Francis Turbine
In this paper, three-dimensional turbulent flow fields in a low specific speed Francis turbine have been obtained by CFD methods, and the performance prediction for the turbine have been made based on the simulation results. Two types of runner have been compared for the turbine: a conventional runner with uniform blades and another runner with splitter blades. The comparison of results shows that by adding splitter blades, the inlet vortex on the suction surface of the long runner blade is inhibited obviously, leading to an increase in turbine efficiency. Furthermore, the minimum pressure on the runner blade with splitter is higher than for the conventional runner, resulting in a better cavitation performance. In addition, the turbulence kinetic energy and vorticity for the runner with splitter are also smaller than that of the conventional runner.
KeywordsFrancis turbine Splitter CFD Performance
This research was supported by the National Natural Science Foundation of China (Grant Nos. 51679195, 51479167 and 51339005).
- 1.Zhang ZL (2003) Development trend of high head Francis turbine and hydraulic characteristics. China Water Resour 4:59–60Google Scholar
- 2.Qian ZD, Li W (2012) Analysis of the effect of cone form of Francis turbine pressure pulsation. J Hydroel Eng 31:278–291Google Scholar
- 3.Xin Z, Wu JH, Chang JS (2010) Analysis and performance prediction of three dimensional turbulent flow in Francis turbine. Trans Chin Soc Agric Eng 26:118–124Google Scholar