不同湍流模型在泵站进水管道的应用研究

Application of Different Turbulence Models in Inlet Pipe of Pumping Station

为探究不同湍流模型在开敞式进水池泵站进水管道中的应用效果,基于Fluent平台,采用雷诺时均化模型中的两方程模型Realizable k-ε模型、RNG k-ε模型、标准k-ε模型、标准k-ω模型、SST k-ω模型共计五种湍流模型对该泵站进行数值模拟,选取了4个不同特征截面,通过对其流线图、流速分布云图中所反映的流动趋势和速度分布变化等情况进行分析,以及对整体水流流动趋势、流场细节的观察,并结合各方案下水力损失、出口断面流速分布均匀度和速度加权平均角折线图,发现采用SST k-ω模型和RNG k-ε模型的方案,对流场流动细节捕捉能力更强,可用于复杂流动或对流场细节要求高的数值模拟中;Realizable k-ε模型和标准k-ω模型下的方案对流场细节的模拟能力较好,可用于对流场细节要求较高的数值模拟计算;标准k-ε模型模拟能力较差,部分流动细节捕捉效果较差,但对整体的流动趋势预测仍有较好的模拟结果,一般场合下可使用该湍流模型。

In order to explore the application effects of different turbulence models in the inlet pipe of open intake pump station,based on Fluent platform,Five kinds of turbulence models including Realizable k-εmodel,RNG k-εmodel,Standard k-εmodel,Standard k-ωmodel and SST k-ωmodel were used to simulate the pump station.Combined with hydraulic loss,velocity distribution uniformity of outlet section and velocity weighted average Angle broken line diagram,it is found that the schemes using SST k-ωmodel and RNG k-εmodel have better ability to capture flow details,which can be used for numerical simulation of complex flow or flow field with high requirement of detail.The schemes based on Realizable k-εmodel and Standard k-ωmodel have better ability to simulate flow field details and can be used for general simulation.The Standard k-εmodel has poor simulation ability and poor capturing effect of some flow details,but it can still be used to predict the overall flow trend.