阶梯溢流坝作为一种重要的消能结构已逐渐赢得广大学者和溢流坝设计者的兴趣.为了深入地认识阶梯溢流坝面水气两相流的复杂特性,引入水气两相流混合模型,采用RNG k-ε紊流模型模拟计算了阶梯溢流坝面水气两相流的流速、掺气浓度、初始掺气点和压力等特征参数.实测结果验证了数值模拟的可靠、合理性,有助于深入研究阶梯溢流坝的消能机理. As an important energy dissipating structure, stepped overflow dam has gradually gained the interest of scholars and designers of spillway.In order to know deeply the complex characteristics of water-gas two-phase flow in stepped overflow dam, Mixed model and the RNG k-ε turbulence model was used to simulate the characteristic parameters of the flow velocity, aeration concentration, initial aeration point and pressure of the water and gas two-phase flow in the stepped spillway dam.The simulation results show that the numerical simulation is reliable, The rationality will help to further study the energy dissipation mechanism of stepped overflow dam.