基于PANS的轴流泵簸箕形进水流道水力特性

为研究簸箕形进水流道轴流泵模拟计算适用湍流模型,基于CFD软件k-ε湍流模型及二次开发修正PANS湍流模型进行三维数值模拟,结果表明:修正PANS湍流模型能捕捉各种湍流尺度的漩涡,能够反应更多内部流动的细节特征;为研究隔墩、隔墩长度及后壁距对进水流道内部水力特性的影响,提出4种方案。结果表明:方案3中进水流道喇叭口外壁附近点压力脉动幅值最小,点J3、J4脉动幅值约为原始方案的77%、62%;方案4中进水流道内部流动特性最好,水力损失最少,约为原始方案的25%。

Study on the hydraulic characteristics of dustpan shaped inlet of an axial flow pump based on PANS

A three dimensional numerical simulation was carried out using CFD model and a modified secondary development PANS turbulence model,to study the turbulence model applicability for simulation of dustpan shaped inlet axial flow pump.The results showed that the modified PANS turbulence model can capture the vortices of various turbulence scales,and can reflect the detail characteristics of internal flows.Four scheme were proposed to study the influence of isolation pier,length of isolation pier and rear wall distance on the internal hydraulic characteristics of inlet passage.The results showed that the pulsation value of point pressure near the outer wall of inlet passage bell mouth was the smallest in scheme 3,and the pulsation value of the point J3 and J4 was about 77% and 62% of the original scheme.In scheme 4,the internal flow characteristics of inlet passage were the best and the hydraulic loss was the least,which was about 25% of the original scheme.