中文摘要：

针对洞塞式泄洪的特征，分析了水流紊动特点，建立了三维RNGk-ε紊流模型，并利用物理模型试验对其计算结果进行了验证；对洞塞式泄洪沿程的最小压强系数进行了计算，分析结果表明，最小压强系数沿程在洞塞突缩端和突扩端附近呈现明显的双峰分布。其他参数一定的情况下，主次峰区的最小压强系数峰值随洞塞段相对长度增加而相应降低；最小压强系数的峰值随突缩比增加明显降低。突缩比比洞塞段相对长度对最小压强系数的影响更为明显。

英文摘要：

In the case of plug discharge, the characteristic of turbulence was studied firstly, then 3-D RNG k-ε mathematical model was established and verified properly by physical model test data. Based on the computational results of the model, minimum pressure coefficient of plug flow was analyzed and generalized, showing that it appeared double peaks around the sudden-shrink area and the sudden-expand area. When other coefficients are definite the minimum pressure coefficient of the double peak areas decreased respectively when the relative plug length increased, and it decreased sharply when the ratio of plug radius to tunnel radius increased. Besides, it was influenced more by variety of the ratio of plug radius to tunnel radius than that of relative plug length.