摘要
针对非结构四面体网格在离心泵内部流动数值模拟中计算效率和离散精度方面的技术缺陷,采用聚合式多重网格方法生成的多面体网格及非结构四面体网格建立XA65/20型单级单吸离心泵内部流场的数值模型,利用Ansys Fluent 13.0对设计工况及多个非设计工况下离心泵内部流场进行了数值计算,得到其内部流场的静压、速度以及湍动能分布情况,并对其内部流动状态进行分析.在数值计算的基础之上,对样机进行了性能试验,预估泵的扬程及效率并与试验值进行对比分析.数值模拟结果表明:多面体网格收敛速度较快、残差曲线更为光顺、占用计算机内存较少,得到静压、湍动能分布更为均匀.模拟计算结果与试验数值的对比验证了多面体网格模拟计算值的可行性与准确性.从网格设置时间、计算成本、数值耗散3个角度分析,多面体网格能较好地应用在离心泵内部流动数值模拟中.
Aiming at the technical defects of calculation efficiency and discretization accuracy in the numerical simulation of internal flow in centrifugal pumps by using unstructured tetrahedral mesh,the flow field within a XA65/20 single-stage and single-suction centrifugal pump under design and off-design conditions was simulated with the software Ansys Fluent 13.0 using polyhedral mesh generated by agglomeration multi-grid method and unstructured tetrahedral mesh.The static pressure,velocity and turbulent kinetic energy distribution of the interior flow field were obtained and analyzed.In addition,the performance of the model pump was experimentally studied,both the head and efficiency of the pump predicted numerically were compared.The results show that the calculation based on polyhedral mesh has higher convergence speed,smoother residual curves and lower computer memory requirement.The pressure cloud and turbulent kinetic energy distribution are more uniform.The comparison between numerical and experimental results verifies the feasibility and accuracy of polyhedral mesh.In the angles of mesh setup time,computational expense and numerical diffusion,polyhedral mesh can be applied in the numerical simulation of internal flow in centrifugal pumps.
出处
《排灌机械工程学报》
EI
北大核心
2013年第12期1039-1044,共6页
Journal of Drainage and Irrigation Machinery Engineering
基金
国家自然科学基金资助项目(50979034)
关键词
离心泵
多面体网格
多重网格法
内部流动
数值模拟
centrifugal pump
polyhedral mesh
multi-grid method
internal flow
numerical simulation
