【摘要】 多孔淹没出流条件下,每股射流周围存在上部回流旋滚和下部横轴漩涡,两股射流之间还可能发生立轴漩涡,消力池内流态十分复杂。为详细了解立轴漩涡是否贯穿,并揭示其产生的根源及运动特性,运用实验观察、理论分析和数值模拟研究其水力特性。结果表明:消力池底部的立轴漩涡是由于三维强紊动水流与边界条件联合作用产生的;立轴漩涡随机不稳定,未贯穿至底板,并随着底部横轴漩滚的形成逐步消失。但立轴漩涡可能存在的危害需作进一步研究。更多还原

【Abstract】 The flow pattern is very complex in the plunge pool with multi-submerged jets plunging into it.Around each jet,there are a lot of back-flow swirls near the water surface and cross rod eddies close to the bottom;besides,vertical-axis eddies may appear between two jets.To research the hydraulic characteristics and occurring mechanics and whether the vertical-axis eddies can reach the bed,experiments,theories and numerical simulation are applied in this paper.The results show that the vertical-axis eddies near the plunge pool bed are caused by the interaction of the 3-D violent turbulent and boundary conditions;the vertical-axis eddies are often random and unsteady.They can not reach the bed,and will gradually disappear with the formation of the cross rod eddy,however,their potential damage need to be further studied.更多还原