摘要
为了探求高拱坝溢流水舌截面形状对下游水垫塘底板动水冲击压力的影响,应用RNGk-ε双方程紊流模型对三维淹没冲击射流进行了数值模拟计算。通过对不同射流截面宽厚比的矩形喷口的三维冲击射流的研究发现,在自由射流区,所得结果与前人的物理实验和数值计算结果吻合良好,说明所选用的紊流模型合理。研究还发现,在射流入水动量相等的情况下,随着射流截面宽厚比的增加,三维淹没冲击射流的轴线流速衰减加快,相应地对固体壁面的动水压力也呈下降趋势。
The RNG κ-ε double-equation turbulence model is applied to simulate the 3-D submerged jet flow to investigate the influence of aspect ratio of flip bucket jet on impact pressure acting on the floor of plunge pool. The calculation results of various aspect ratio show that the flow velocity distributions in free jet region are in good agreement with the experimental data given by predecessors. It implies that the turbulence model adopted is reasonable. The further investigation indicates that following the increase of sapect ratio the axial velocity of jet flow attenuates rapidiy, if the initial momentum of the jet maintains constant, and results in the reduction of imoact oressure acting of the wall.
出处
《水利学报》
EI
CSCD
北大核心
2005年第10期1230-1235,共6页
Journal of Hydraulic Engineering
