关键词：
灯泡贯流泵;数值模拟;顺序流固耦合;结构应力;外特性
摘 要：
采用RNG k-ε湍流模型及SIMPLEC算法,对灯泡贯流泵装置内部三维流场进行全流道湍流数值模拟.采用顺序耦合方法,应用ANSYS Workbench软件,对叶轮进行结构静应力数值分析,并通过试验进行对比验证.结果表明:通过数值模拟与原型泵试验得到两者外特性曲线的变化趋势大致相同;工作面静压整体上较背面高,叶片背面进水边靠近轮缘位置出现局部低压,易发生空化;叶轮强度主要受离心力和流体压力的影响,且两者共同作用下的最大等效应力和最大总位移远小于两者单独作用的值;叶轮最大等效应力随流量的增大而增大,最大总位移随流量增大呈先减小后增大的趋势,最大等效应力出现在叶片出水边与轮毂交接处,叶轮变形的总位移随叶轮半径的增大而增大,最大变形量出现在叶片出水边靠近轮缘位置;强度校核结果表明,叶轮强度符合要求.计算结果可为灯泡贯流泵的应力特性分析提供参考.
译 名：
Strength analysis of bulb tubular pump impeller based on fluid-structure interaction
作 者：
Tang Xuelin;Wang Xiuye;Jia Yuxia;College of Water Resources and Civil Engineering,China Agricultural University;
关键词：
bulb tubular pump;;numerical simulation;;sequential coupling method;;structural stresses;;external performances
摘 要：
The RNG k- ε turbulence model and SIMPLEC algorithm are used to simulate the steady,three dimensional,internal flow field in a bulb tubular pump with up- and down-stream flow passages.Subsequently,the static stress in the impeller structure is analyzed numerically on ANSYS Workbench by means of sequential coupling method. The results show that the predicted performance curves of the pump are basically in agreement with the measurements. Additionally,the static pressure on the blade pressure side is higher than that on the suction side as a whole,and the low pressure appears on the blade leading edge near the impeller tip,where cavitation may be apt to occur. Impeller strength is mainly affected by centrifugal force and fluid pressure,also the peak equivalent stress and peak total displacement caused from both the centrifugal force and fluid pressure are far less than those generated by each of them. The peak equivalent stress rises with increasing flow rate,but the peak total displacement has one minimum at a flow rate. The peak equivalent stress occurs at the blade root near the blade trailing edge. The deformation of the impeller structure becomes more dominated with increasingradius,and the peak deformation appears on the blade tailing edge near the impeller tip. The results show that the impeller strength meets the requirement for operation. The presented results can provide a reference for analysis of stress characteristic of bulb tubular pump impeller.
