抛雪离心风机叶轮内部流场分析及结构优化

摘要

To optimize performance and internal flow field structure of centrifugal ,numerical simulation is applied on impeller flow field structure in throwing snow centrifugal fan named P 4-35-01No.03.First,three-dimensional entity model is set up in Creo soft-ware,set up the import entity formation fluid field in ANSYS software ,and then based on Fluent software analyzes fluid .Through changing primary structural parameters ,observe impeller flow field character of centrifugal fan with different structural parame-ters.Increasing impeller inlet pitch ,the snow flow in outlet will decrease and velocity of snow parts will sharply increase .Decrea-sing blade initiative pitch ,snow flow in outlet will remarkably reduce ,that lead to hinder velocity of snow parts in outlet raise .De-creasing blade outlet angle will be beneficial to optimize phenomenon——snow parts unequally distribute in impeller .When blade outlet angle is 20 °,velocity distribution of all flow pass in impeller are consistently distributed in circle direction .Research results discover some defects in original designs ,provide the reference basis for the design and production of the centrifugal fan impeller in the future .%为优化抛雪离心风机性能和内部流场结构,对型号为P4-35-01No.03的抛雪离心风机叶轮内部流场结构进行数值模拟计算.首先,在建模软件Creo中建立三维实体模型,将其导入ANSYS软件中,形成流体域,再用Fluent软件进行流体分析.通过改变主要结构参数,观察不同结构参数下离心风机叶轮区的流场特征.叶轮入口直径增大,则离心风机出口处雪流量减小,出口处雪颗粒速度大幅增加;减小叶片起始直径,离心风机出口处雪流量会急剧减小,并且阻碍出口处雪颗粒速度上升;减小叶片出口角,则会改善叶轮区域速度矢量分布不均匀现象;当叶片出口角为20°时,叶轮所有流道内速度分布沿圆周方向完全一致.随着研究的深入,发现了初步设计中的缺陷,研究结果为今后实际抛雪离心风机叶轮的设计生产提供了参考依据.