混流泵叶轮的正反问题迭代法设计及流动分析  

Iteration design of direct and inverse problems and flow analysis of mixed-flow pump impellers

作　　者：邴浩[1] 张勤昭[2] 曹树良[1] 谭磊[1] 祝宝山[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 [2]清华大学核能与新能源技术研究院,北京100084

出　　处：《清华大学学报（自然科学版）》2013年第2期179-183,共5页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(51176088);国家"八六三"高技术项目(2008AA05Z201);水沙科学与水利水电工程国家重点实验室统筹研究课题资助项目(2009T3)

摘　　要：提出了用正反问题迭代法设计混流泵叶轮的新方法。该方法能够有效地弥补传统方法设计叶片时轴面流动的计算仅满足流体连续方程的缺陷,同时考虑了叶片形状对轴面流场计算的影响。通过两类相对流面迭代求解流体连续方程与运动方程,完成设计叶轮的正问题计算。采用逐点积分法进行叶片骨线绘型,在轴面上加厚叶片,在保角变换平面内修圆叶片头尾部,完成反问题设计。正反问题迭代计算直至收敛,最终完成混流泵叶轮的设计。采用SIMPLEC算法,通过求解Navier-Stokes方程和RNGk-ε湍流模型方程,模拟了混流泵叶轮内的三维流场,获得了叶轮内的速度与压力分布。结果表明:正反问题迭代方法设计的叶片对于水流的控制能力增强,叶轮内部流动稳定,压力分布均匀,具有更优的水力性能。A design method was developed using iteration calculation of direct and inverse problems to design mixed-flow pump impellers. The method covers the shortage of the traditional design method, the meridional flow calculation of which only satisfies the continuity equation of fluid when designing the blade. The method also considers the effect of the blade shape on the calculation of the meridional flow field. The direct problem when designing the impeller was settled using iterative calculation for two kinds of stream surfaces to solve the continuity and motion equations of fluid. The inverse problem of the mixed flow pump impeller was settled using point-by-point integration method to draw the blade shape,thickening the blade and smoothing the leading edge of the blade by conformal mapping. The impeller was not ultimately determined until the iterative calculation of direct and inverse problems were converged. The three-dimensional flow field of the mixed-flow pump impeller was simulated with the velocity and the pressure distributions inside the impeller obtained by solving Navier-Stokes equation and RNG κ-ε turbulent model equation using SIMPLEC algorithm. Simulation results show that the blades designed using this method lead to stronger control of flow, steadier internal flow of the impeller, more uniform pressure distribution and better hydraulic performance.

关 键 词：混流泵 叶轮 设计 流动分析 

分 类 号：TH313[机械工程—机械制造及自动化]