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为了进一步研究齿墩式内消能工的水力特性,提出了一种新型的消能方式,即二级齿墩式内消能工。通过建立标准κ-ε数值模型对单级齿墩式内消能工进行数值模拟,并与物理模型试验的结果进行对比,验证了模型的准确性,进而对二级齿墩式内消能工的部分水力特性进行数值模拟。结果表明,在齿墩段间距不变的条件下,随着面积收缩比减小,管道的过流能力变弱,消能率增大,压强降幅明显;在面积收缩比不变的条件下,齿墩段间距在一定范围内的增长会使管道消能率变大,过流能力减弱,最小空化数减小,产生负压和空化现象的可能性增加;当齿墩段间距大于80 cm时,管道的过流能力及消能率基本保持稳定。
In order to further study the hydraulic characteristics of tooth-pier internal energy dissipater, a new energy-dissipating mode is proposed, that is, a two-stage tooth-pier internal energy dissipater. Through the establishment of a standard κ-ε numerical model to simulate the single-stage tooth-piers dissipater, and compared with the results of the physical model test, the accuracy of the model is verified, and then the second- Part of the hydraulic characteristics of numerical simulation. The results show that with the constant distance between teeth and segments, the overcurrent of the pipe becomes weaker as the area shrinkage ratio decreases, the energy dissipation rate increases and the pressure drop obviously. Under the condition of constant area shrinkage ratio, The increase of the distance between pier segments within a certain range will increase the energy dissipation rate of the pipe, decrease the overcurrent capability, reduce the minimum cavitation number and increase the possibility of negative pressure and cavitation. When the spacing of the tooth segments is greater than 80 cm The overcurrent capacity and energy dissipation rate of the pipeline basically remained stable.