渥奇面上掺气挑坎位置的试验与数值计算分析

采用了紊流模型对设掺气挑坎的渥奇面流场进行了计算,并通过试验验证,发现该模型可较精确地模拟挑流流场和掺气空腔.同时结合试验资料,对掺气挑坎的布设位置进行了研究,得出了相同体型和水力条件下挑坎布于渥奇段下游优于上游的结论,前者流态稳定,散水减弱,下游掺气较佳,可成功解决渥奇段下接高速水流区的掺气减蚀问题,该模型和位置优化结果对掺气挑坎设计选型及布置有指导意义.

Experimental and numerical modeling for the location of a bucket aerator on an arch structure

The flow of the arch structure with a bucket aerator was calculated by the turbulence model, and the results were verified by experimental data. It shows that this numerical model can to a certain extent accurately simulate the jet overflow and cavity behind the bucket aerator. The location of the bucket aerator was studied in the experiment. The laying position of the bucket aerator is better downstream than upstream with the same configuration and hydraulic condition, of which the former has more stable flow, weaker spray and better aeration, so it can successfully alleviate cavitations by air entrainment. This model and the location optimization conclusion for a bucket aerator are of great significance for the configuration and laying of the aerator on arch structure.