中比转速离心泵叶轮的优化设计及数值模拟  

Optimal design and numerical simulation for impeller of centrifugal pump with medium-high specific speed

作　　者：谭磊[1] 曹树良[1] 

机构地区：[1]清华大学热能工程系水沙科学与水利水电工程国家重点实验室,北京100084

出　　处：《排灌机械工程学报》2010年第4期282-285,290,共5页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(50776052);国家863计划项目(2008AA05Z201)

摘　　要：基于流体流动的连续方程和运动方程,通过两类相对流面的迭代计算,实现中比转速离心泵叶轮内准三维正问题的数值计算,得到了轴面速度分布.应用逐点积分法进行叶片骨线绘型,在轴面上加厚叶片,在保角变换平面上修圆叶片头部,实现了离心泵叶轮的反问题设计.正反问题进行迭代计算求解直至收敛,得到最终设计的叶轮.采用RNGk-ε湍流模型和SIMPLEC算法,对离心泵叶轮内三维流场进行数值模拟,得到了叶轮内压力和速度分布.模拟结果表明设计得到的叶轮内部压力分布非常均匀,流动稳定无分离,叶轮出口能量分布合理,所设计的叶轮具有优越的水力性能.Based on continuity equation and motion equation of fluids,the flow field of quasi-three-dimensional direct problem was solved through iterative calculation for two kinds of stream surfaces. The distribution of axis plane velocity in medium-high specific speed centrifugal pump impeller was obtained. Based on the flow field of the direct problem,the inverse problem of centrifugal pump impeller was designed by drawing blade shape with point-by-point integration,thickening blade and smoothing leading edge of the blade through conformal mapping. The impeller was not finally accomplished until the iterative calculation of direct and inverse problems were converged. The three-dimensional flow fields of the centrifugal pump impeller designed were simulated with RNG k-ε turbulent model and SIMPLEC algorithm. The distributions of pressure and velocity field inside the impeller were obtained. The simulation results show that pressure distribution inside the impeller designed here is well uniform. The flow inside impeller is steady without separation. The energy distribution at impeller outlet is reasonable. The impeller designed by this method has superior hydraulic performance.

关 键 词：离心泵 叶轮 优化设计 数值模拟 

分 类 号：S277.9[农业科学—农业水土工程] TH312[农业科学—农业工程]