摘要
基于正反问题迭代设计方法,通过给定不同的速度矩分布规律、叶片进出口边位置等关键参数,设计了一系列混流泵叶轮。在此基础上,基于SIMPLEC算法,通过求解Naiver-Stokes方程和RNG k-ε湍流模型方程,模拟了叶轮内的三维湍流流场,获得了采用不同关键参数时叶轮内的速度与压力分布。针对数值模拟结果,分析了关键参数对于叶轮设计的影响。结果表明:基于类抛物型速度矩分布规律设计的叶片对于流体运动方向的控制能力最强,具有最优的水力性能;叶片进、出口边轴面距离适当增大有利于改善内部流动,水力效率可获得提升,但当距离过大时,会因表面摩擦损失增加导致效率下降。
Based on an iterative design method, a series of mixed-flow pump impellers were designed by setting different values of some key parameters, such as velocity moment distribution and positions of the leading and trailing edges. The three-dimensional flow field of a mixed-flow pump impeller was simulated by solving the Navier-Stokes equations and a RNG k -eturbulent model with the SIMPLEC algorithm, and the distributions of velocity and pressure fields inside the impeller were obtained. The simulated data were used to analyze the effects of key parameters and evaluate the impeller designs. The results show that the blades designed on the velocity moment distribution of parabolic-like type, are the strongest in controlling flow directions and the best in hydraulic performance. An appropriate increase in the meridional distance between the blade＇s leading and trailing edges can improve the internal flow and enhance the hydraulic efficiency, but a too great distance leads to efficiency loss due to skin friction.
出处
《水力发电学报》
EI
CSCD
北大核心
2013年第3期229-233,246,共6页
Journal of Hydroelectric Engineering
基金
国家自然科学基金(51176088)资助项目
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)
关键词
水力机械
混流泵
数值模拟
进口边
出口边
速度矩分布
hydraulic machinery
mixed-flow pump
numerical simulation
leading edge
trailing edge
velocity moment distribution
