基于 CFD的轴流泵流场特性分析

摘要

For more further research on axial-flow pump,learning pump running under different conditions and to further emphasizing the impor-tance of optimal conditions running,combined with a model pump data in South-to-North Water Transfer Project,the model pump were numerically simulated by using CFD software Fluent with multiple reference system coordinates were chosen and based on the S-A turbulence model. Axial flow pump hydraulic performance under different conditions were estimated by calculating,the external characteristic curve were drawn. Compared with the experimental result,they were approximate,showing the simulation’s accuracy. The pressure and velocity distribution of blade and guide vanes were analyzed based on the result of the numerical simulation. Some laws of blade and guide vanes’flow pattern under different conditions were showed,the bland pressure was increased in the radial. The magnitude of relative velocity presented cylindrical surface distribution increased from hub to rim. The pressure of Guide vanes was presented as zonal distribution and water flowed out along the axial finally.%为更深入研究轴流泵，了解不同工况下轴流泵的运行状态，进一步强调最优工况运行的重要性，结合南水北调工程中某泵站模型的数据，采用流体力学软件Fluent，在多重参考坐标系下，选用S-A湍流模型对模型泵进行数值模拟。通过计算，对不同工况下的轴流泵水力性能进行了预估，绘制了轴流泵的特性曲线，与试验值进行比较，吻合较好，说明了数值模拟的准确性。根据数值计算结果，分析了轴流泵叶轮叶片和导叶叶片表面的速度及压力分布，揭示了叶片和导叶表面流态和压力的分布规律：叶片压力径向递增，相对速度由轮毂到轮缘逐渐加快，按圆柱面分布，导叶表面压力呈带状分布，水流最终从导叶出口沿轴向流出。