摘要
根据实际工程的需要,对需在某具体水力参数下工作的水轮机转轮通过CFD的手段进行了转轮水力模型的设计与开发.设计过程中,基于RANS方程,采用标准k-ε湍流模型和有限体积法,对转轮内部的流动状态在某具体水力参数(含特征工况点)下,进行了全三维粘性流动的数值模拟;依据各工况下的模拟结果和分析其流态与流场分布情况的基础上,对初始设计出的模型转轮的翼型和叶片几何形状、尺寸做了进一步修正、改进;经性能预估验证,得到了水力性能良好的新的混流式转轮水力模型.文中采用结构和非结构化网格相结合的划分方法,不仅可行,而且还提高了网格质量和计算精度;用叶片正背面压力差表示叶片上压力分布的变化规律,可以更清晰地反映出叶片的作功情况.
According to the needs of engineering, design of hydraulic model runner and development were conducted for the runner with specific hydraulic parameters by using CFD method. Based on RANS equation,k-ε model, and finite-volume method,the internal flow within a Francis turbine runner with specific hydraulic parameters, including optimum operating condition, was simulated in designing process. According to the analysis of simulation results and flow states at different operation conditions, some further modifications of the aerofoil, geometry, and dimensions of vanes was mode. A high performance hydraulic model runner was obtained through performance prediction. The use of structure, and unstructured grids for the calculation was not only feasible but also capable of improving the grid quality and calculation precision. The variation pattern of pressure difference on suction surface and pressure surface of blades clearly reflected the workdone of blades.
出处
《兰州理工大学学报》
CAS
北大核心
2006年第5期48-52,共5页
Journal of Lanzhou University of Technology
