旋流自吸泵突台结构数值模拟及对性能的影响

基于大涡模拟方法,设定适当的边界条件,利用三维非结构四面体网格进行网格划分,采用有限体积法对控制方程进行离散,应用CFD软件Fluent对旋流自吸泵的内部三维湍流流场进行数值计算,得到泵内部流场的分布情况以及突台附近区域的流动情况.为了研究突台结构对性能的影响,对应不同突台结构,分别计算了不同工况下的流动情况,预测旋流自吸泵的宏观性能并绘制了性能曲线.通过对数值模拟结果的分析和对比,在获得旋流自吸泵宏观性能曲线的基础上,分析突台附近区域的内部微观流场与宏观外部特性之间的关系.结果表明,突台结构对扬程、效率影响较大,而对于功率影响较小.基于CFD辅助设计,通过对突台尺寸参数不同方案的性能的对比分析,获得突台尺寸参数的最佳值,从而为泵的改进设计提供参考.

Numerical simulation of boss structure and its impact on rotational flow self-priming pump performance

The inner flow field of a rotational flow self-priming pump was simulated based on large eddy simulation（LES）with three-dimensional non-structural mesh and finite volume method,and proper boundary conditions were determined according to this issue.The commercial CFD software Fluent was applied.The distribution of inner flow field within pump and boss region nearby was obtained.In order to study the influence of boss structure with different parameters,computation of performance prediction was carried out under several different operating conditions,and the performance curves were obtained.According to the numerical results,the relations between the inner flow field within boss region and the overall characteristics were investigated based on the performance curves.The influence of boss structure on performance was revealed by comparing the external characteristics with different boss parameters.It is found that boss structure has greater impact on head and efficiency,but lesser impact on shaft power.The optimal value of boss parameters can be obtained by use of CFD-aided design and comparative analysis of performances with different boss structure parameters,which can provide a reference for pump optimal redesign.