【摘要】 应用重力相似准则,对台阶式泄水建筑物的消能进行了系统的模型试验研究。结果表明,当坡角θ=5.7°~60°,相对临界水深hk/h≤3以内,跌落水流、过渡水流和滑行水流三种流况条件下的消能率基本相同,其消能率随相对坝高(hdam/hk)增加而增大,随坝坡变陡而减小。台阶段消能率与消力池消能率之间的关系为,随坝坡变陡,台阶段的消能率逐渐变小,消力池的消能率逐渐增大,也就是说,台阶段和消力池之间的消能率之差随坝坡变陡而逐渐加大。台阶高度对消能率影响很小,大约只有1%左右,消能率随流量增大而减小。更多还原

【Abstract】 With the gravity similarity criterion,the hydraulic model test at stepped sluicing structure for energy dissipation is carried out systematically.The results indicate that the energy dissipation ratio is nearly the same under the three flow conditions of nappe flow and transition flow as well as the skimming flow when the slope ranges between 5.7° and 60° and the relative critical water depth is h_k/h≤3.Meanwhile,the energy dissipation ratio increases with the rising of relatively dam height(H_dam/h_k) and decreases with the increasing of dam slope.The relation of energy dissipation ratio between step and stilling basin is that the energy dissipation ratio decreases gradually at step section and the energy dissipation ratio increase gradually at stilling basin when the dam slope increases.Namely,the difference of energy dissipation ratio between step and stilling basin increase with the increasing of dam slope.The height of step has less influence on energy dissipation ratio,it is just around 1%,moreover,the energy dissipation ratio decreases with the increasing of flow discharge.更多还原