二级齿墩式内消能工的数值模拟

发布时间：2018-04-21 07:17

本文选题：二级齿墩式消能 + 数值模拟　；参考：《水电能源科学》2017年06期

【摘要】：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。
[Abstract]:In order to further study the hydraulic characteristics of the inner energy dissipators with tooth piers, a new type of energy dissipation method is proposed, that is, the internal energy dissipators with two tooth piers. The standard 魏-蔚 numerical model is established to simulate the internal energy dissipators of single-stage tooth piers, and the results are compared with the results of physical model tests, and the accuracy of the model is verified. Then the numerical simulation of the hydraulic characteristics of the inner energy dissipator of the two-stage tooth-piers is carried out. The results show that with the decrease of area shrinkage ratio, the over-current capacity of pipeline becomes weaker, the energy dissipation rate increases, and the pressure drop is obvious under the condition of constant spacing of tooth piers, and under the condition of constant area shrinkage ratio, The increase of the distance between the tooth piers in a certain range will increase the energy dissipation rate of the pipeline, weaken the overcurrent capacity, decrease the minimum cavitation number, increase the possibility of negative pressure and cavitation, and increase the probability of producing negative pressure and cavitation when the distance between the tooth piers is more than 80 cm. The pipeline's overcurrent capacity and energy dissipation rate are basically stable.
【作者单位】：太原理工大学水利科学与工程学院;
【基金】：山西省自然科学基金项目(2013011037-4)
【分类号】：TV653

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