关键词: 泵站进水前池; 侧向进水; CFD; 流态分析; 流速均匀度; 能量梯度;

Abstract: Taking the Touzha diversion pump station in Gaoyou City as an example, this paper studied the problems of local reflux and bad flow regime in the lateral intake forebay. The flow field in the intake forebay under different schemes was simulated by ANSYS CFX software based on Reynolds time N-S equation and RNG k-εturbulence model of 3 D incompressible fluid, and the influent structure was optimized based on energy gradient theory. The results showed that by adding diversion wall and arc bottom sill in the forebay, the reflux in the forebay and vortex can be effectively eliminated. The flow velocity uniformity of the inlet cross section of the original scheme, scheme 1 and scheme 2 were 78.7%,84.6% and 90.2% respectively. Energy gradient K value in the large scale reflux and vortex occurrence position were very large. The mechanism of unstable flow field in lateral intake forebay structure of pump station was revealed by energy gradient theory. The results can provide some reference for the optimization of influent structure in similar project.

Key words: intake forebay of pumping station; lateral influent; CFD; flow pattern analysis; flow velocity uniformity; energy gradient;