基于CFD的长短叶片水轮机全流道湍流流动定常研究

Study on steady flows of Francis turbine with long and short blades by CFD simulation

以混流式水轮机HLA351为原型,基于FLUENT,采用Realizable k-ε双方程湍流模型和三维时均N-S方程,对长短叶片结合混流式水轮机在额定流量工况下湍流流动进行了全流道三维定常模拟研究,获得了长短叶片水轮机全流道的流速和压力分布。计算结果表明,长短叶片结合的水轮机流速和压强分布合理、性能优,对水力机械的设计等研究具有重要的指导意义。

Three-dimensional turbulent flows through turbine runner with long and short blades of a Francis turbine HLA351 were numerically simulated with FLUENT that uses the Reynolds equations and a realizable k-ε turbulent model in a general coordinate frame.The results show that the details of full-passage flow can be well predicted,and that hydraulic performance of the runner with long and short blades is better in terms of its velocity and pressure distributions.These results would be useful for hydraulic design and optimization of Francis turbine.