Study on Influence of Step Length on Energy Dissipation of Stepped Spillway
Based on computational fluid dynamics(CFD)method,software Flow 3D is used to numerically simulate the two-phase flow on stepped spillways to clarify the influence of step length on the energy dissipation characteristics of stepped spillways.With a fixed step height 1 m,the impact of step length on energy dissipation of stepped spillways is systematically studied.The results show that the step height and step length directly determine the size of the swirling vortex area,which is the key factor in determining the energy dissipation rate of the stepped spillway.With a fixed step height,the longer the step length is,the larger the size of the swirling vortex area is,and the higher the energy dissipa-tion rate of the stepped spillway is.However,when the step length increases to a slope ratio of 1∶2.2,the size of the swirling vortex area corresponding to this step height is approaching the maximum,resulting in that stepped spillway with a slope ratio of 1∶2.2 can properly balance the economy and energy dissipation.
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