弧形闸门开启过程非恒定流流量系数研究

Study on Flow Coefficient of Unsteady Flow During the Opening Process of Radial Gate

为探究非恒定流流量系数特点,采用RNG k-ε紊流模型结合动网格技术对某工程Y形宽尾墩表孔弧形闸门开启过程进行了三维动态数值模拟研究,根据过闸流量滞后的特点,将闸后水流分为滞后式、过渡式和平稳式3种流态。分析了闸门开启过程中水流流态及非恒定流流量系数与闸门开启速度和溢流堰顶水头的关系,指出非恒定流流量系数随闸门开启速度的加快及堰顶水头的降低而减小,并给出不同开启速度和堰顶水头情况下适于过渡式及平稳式水流的流量系数经验公式。部分结果与试验结果进行对比,吻合良好,验证了数值方法的可靠性。

In order to study the characteristics of unsteady flow coefficient, the paper used the RNG k - ~ turbulent model and dynamic mesh technology to simulate the unsteady flow of flaring gate pier and stilling basin during the process of radial gate opening, and described the re- lationship between flow coefficient and opening velocity and weir head. There were three flow forms after radial gate that was lagged pattern, transitional pattern and steady pattern. The unsteady flow coefficient suitable for transitional flow and steady flow decreased while the opening velocity was larger or the weir head was lower. The empirical formula of flow coefficient was obtained. The simulation results agree well with the data obtained in experiments, which shows the numerical method is efficient.