摘要
基于三元反设计理论,将环量vur沿轴面流线的变化梯度作为载荷分布的控制参数,采用两段抛物线来描述载荷沿轴面流线的分布规律.为了分析载荷分布规律对混流泵叶轮设计结果的影响,建立了"前载型"、"中载型"和"后载型"3种混流泵叶轮.基于雷诺时均的Navier-Stokes方程、SST湍流模型和多参考坐标系模型对3种叶轮内流场进行数值模拟,对叶轮的能量性能和叶片表面压力分布进行分析.结果表明:采用两段抛物线表示载荷沿轴面流线的分布规律是合理的,基于载荷分布的叶片三元反设计能有效控制叶片表面的压力分布特性;载荷峰值点越靠近导边,叶轮的扬程、功率和效率值越高;在设计流量工况,前载型叶轮与后载型叶轮的扬程、功率和效率的差别分别为18.30%,16.40%和2.01%;不同载荷分布时叶轮能量性能的差别随流量的增加而逐渐明显.
Based on three-dimensional inverse design theory, the meridional gradient of circulation Vuras adopted as control parameter of blade loading distributions. Two parabolic curves were proposed to describe blade loading distributions along meridional streamlines. In order to analyze influences of blade loading distributions on design of mixed-flow pump impellers, three impellers respectively with fore-loaded, mid-loaded and aft-loaded blade loading distributions were designed. Based on the RANS equations, SST turbulence model and multiple-reference-frame model, flow fields of the impellers were simulated and the impeller performances and blade surface pressure distributions were analyzed. The results shrew that it＇s praeticable to apply two parabolic curves to describe blade loading distributions, Three-dimensional inverse design theory with adjustable blade loading distributions can effectively con-trol pressure distributions on blade surfaces. As the location of blade loading peak approaches leading edges, impellers performances of head, power and efficiency all increase. At the design flow rate, differences of head, power and efficiency between fore-loaded impellers and aft-loaded impellers are 18.3%, 16.4% and 2.01% respectively. With different loading distributions, differences of lhree impeller performances are gradually obvious as flow rate increases.
出处
《排灌机械工程学报》
EI
北大核心
2013年第2期123-127,共5页
Journal of Drainage and Irrigation Machinery Engineering
基金
国家自然科学基金资助项目(51009142)
关键词
混流泵
叶轮
载荷
分布规律
数值模拟
mixed-flow pump
impeller
blade loading
distribution law
numerical simulation
