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直导叶因其易于加工而广泛应用于轴流式叶片机械。为研究直导叶内的流动特性及其设计方法,以高比转速双向泵为研究对象,基于全结构化网格,采用SST k-ω湍流模型分析了加直导叶时泵内流动损失机理及直导叶几何参数对泵外特性和内流场的影响,总结了直导叶的设计方法。结果表明:直导叶弦长和叶片数增加会扩大发生流动分离的区域,形成大尺度回流;减小导叶-叶片轴向间距会增大直导叶进口冲角,加大分离强度,因此应在结构强度允许的情况下尽可能减小弦长及叶片数并适当增加轴向间距。研究结果可为轴流式叶片机械的直导叶设计提供一定参考。
Straight vanes are widely used in axial-flow vane machines because of their ease of processing. In order to study the flow characteristics and design method of the straight guide vane, the high specific speed bi-directional pump is taken as the research object. Based on the fully structured grid, the SST k-ω turbulence model is used to analyze the flow loss mechanism And the influence of straight guide vane geometrical parameters on pump outer characteristics and internal flow field are summarized. The design method of straight guide vanes is summarized. The results show that the increase of chord length and number of blades will enlarge the area where flow separation occurs and form large-scale backflow. Reducing the axial distance between guide vanes and blades will increase the angle of incidence of straight guide vanes and increase the separation strength The chord length and the number of blades should be reduced as much as possible with the structural strength allowed and the axial spacing appropriately increased. The results can provide certain reference for the design of straight vane of axial-flow vane machine.