Author(s): Zheng Xiaobo; Luo Xingqi
Linked Author(s):
Keywords: The concrete spiral; Three-dimensional flow; Numerical simulation; Optimization design
Abstract: The scroll case is an important component of the water turbine. To study three- dimensional flow through the scroll case is of great benefit to improve the performance of the turbine. With the rapid development of computational method and computer, the analysis of flow field within the spiral case with numerical method has been a main tool to optimize the spiral case. Based on the Reynolds-averaged N-S equations and the standard k-ε model, the numerical simulation of three-dimensional flow through a concrete spiral case was conducted by using the SIMPLE scheme with the non-structural grid systems in the paper. The wall function was adopted near the surface of the solid boundary. The analysis for the flow through concrete spiral case with one pier and two piers was present. The effect of the piers on the distribution of velocity and press in the spiral case, outlet-angle, and efficiency of the spiral was studied. The result can be used in the optimization design for the concrete spiral case.
Year: 2005