城门洞断面形状对其动能修正系数影响的研究

Study of Impact of Gate Arch-shaped Section on Kinetic Energy Correction Factor

为了研究城门洞断面形状对动能修正系数的影响,基于纳维-斯托克斯方程以及标准κ-ε湍流模型,采用数值模拟结合理论分析的方法,计算了不同高宽比以及拱顶圆心角下的动能修正系数.数值计算结果与试验数据较为吻合,验证了数值计算方法的可靠性.计算结果表明:当高宽比(h/B)为0.5、拱顶圆心角θ在150°~180°之间时,动能修正系数最小,即洞内流速分布最均匀.研究结果为输水工程的导流洞设计提供了理论参考.

Based on Navier-Stokes equation and κ-ε turbulence model, the gate arch-shaped section which has impact on kinetic energy correction factor has been studied. Kinetic energy correction factors are calculated in different depth-width ratios and vault central angles by using physical model tests in combination with theo- retical analysis. Numerical calculation result tallies with the experimental data, so as to verify the reliability of the numerical calculation method. The result show that kinetic energy correction factor is the smallest when depth-width ratio is 0.5 and vault central angle is between 150° and 180°, which means radial velocity distribution most uniform. The results of the study provide a theoretical reference for diversion tunnel design in water conveyance projects.