向家坝水垫塘的实验研究与数值模拟

Tests and numerical simulation of the plunge pool for Xiangjiaba dam

多股水平淹没射流消力池的大量试验研究结果表明:泄槽的体形以等宽或微收缩为宜;水平方向窄而垂直方向厚的水舌适应水位变化的稳定性较好,能始终保持水平淹没射流状态;表、中孔的最优坎高差应大于中孔水流的主流水深,以使表层水跃的回流漩滚区向两侧表孔溢流面充分扩散,从而减弱或消除中孔表层水跃的横轴漩滚。用三维RNGk-ε紊流模型进行了数值模拟,将计算的消力池底板压强及水深与试验结果进行了对比,两者符合较好。

A large number of test and research results of the pool with several horizontal submerged jets showed that the better shape of chute channel is equal-wide or micro-contraction. The water with narrow in horizontal direction and thickness in vertical direction could comparatively suitable to the stability of water level change and can keep the states of horizontal submerged jet flow. The best sill height difference between the surface and middle holes should larger than water depth of main water flow of middle hole. The numerical simulation was made by adopting 3-D RNG k-ε turbulence model. The calculated pressure and water depth on the bottom slab of plunge pool are compared with those of the tests. The comparison results showed that they are in agreement.