不同墩型溢流坝水动力特性研究

Investigation of hydrodynamic characteristics of overflow dam with different types of piers

利用有限体积法对不同墩型溢流坝三维流场进行了数值模拟,并将数值模拟结果与试验结果进行了对比,同时还讨论了不同墩型对水面线形状、坝面压力、流量系数以及不同墩厚闸宽比对坝面压力的影响.结果表明,不同墩型对墩前水面线及流量系数的影响是不同的,随着墩厚闸宽比的减小,坝面压力会逐渐降低,负压极值点将向前移动.

Numerical simulation was performed of 3-D flow fields around the overflow dam with different types of piers by use of the finite volume method. The turbulence was simulated with RNGk-ε turbulence models, and the flow profiles were derived by the VOF method. The calculated results were in good agreement with the experimental data. The analysis of the influences of the pier types on the form of flow profiles, pressure on dam surface and flux coefficient and the influence of the ratio of pier thickness to gate width on the pressure on dam surface shows that the piers of different types have different influences on the flux coefficient and the flow profile at front of piers, and that the pressure on dam surface gradually decreases with the ratio of pier thickness to gate width, and with the decrease of the pressure, the extreme point of negative pressure moves ahead.