引水电站侧向进水口体型设计的数值模拟研究

引水电站侧向进水口因河流主流方向与引水管水流方向垂直,易出现贯通式吸气漩涡.为研究进水口合理体型,采用RNG?k-方程紊流模型对四种不同体型电站进水口水流运动进行数值模拟.分析进水口内水流运动螺旋流线、漩涡强度、引水管进口流场分布情况,比较四种体型(大喇叭口型,钟型,碗型,不对称型)进水口的差异.得出碗状进水口内水流流态更好,不易出现贯通性漩涡,水力损失较小,体型设计具有相对优势,对于侧向进水口体型设计有参考意义.

Numerical simulation study of the shape design at horizontal intakes

The storied relation between the river flow direction and the water direction in the aqueduct, brings about through type inspiration vortex easily in the cited hydropower lateral intake. In order to study the reasonable shape of water intakes, the flow in four types of intakes （the big horn mouth shape, the bell shape, the bowl shape, the asymmetric shape） was simulated numerically using the RNG k-g turbulent model. A few hydraulic characteristics were investigated and compared, which were the flow motion stream line, the vorticity magnitude and the distribution of flow field at the entrance of aqueduct. The results show that the bowl-shaped intake has advantage in the flow condition and the head loss, and is not easy to bring about through type vortex. The research is in prospect of reference for the similarity intake design.