应用平面紊动射流理论，对跌坎型底流消能工消力池内水流流态进行分区，并分析了冲击区水流结构。同时根据动能势能转化原理，采用坐标转换的数学方法，推导出跌坎型底流消能工冲击区时均压强的经验公式。最后，利用水力学模型试验，验证了该公式的合理性，并通过改变入池能量、入射角度、跌砍深度等条件，分析了跌坎型底流消能工冲击区时均压强的变化规律。

The plane turbulent jet theory was used to partition the flow regime in the stilling pool of the energy dissipater with step-down floor and analyze the flow structure of the impact area. Based on the principle of potential energy converting into kinetic energy, the empirical formula of time-averaged hydrodynamic pressure of the energy dissipater with step-down floor in the impact area was derived using the mathematical method of coordinate transformation. The reliability of the formula was verified by the hydraulic model experiments. The variations of the flow pressure of the energy dissipater with the step-down floor were analyzed with the variations of the incident energy, incident angle, and –drop sill depth.

国家自然科学基金（51169088）