M型截面流道对旋涡泵性能的影响分析

为了减少旋涡泵流道内部冲击损失,提升旋涡泵的性能,研究了基于面积不变理论改变旋涡泵流道截面形状的方法。采取流道形状贴合流动状态的策略,改变流道截面形状为M型,利用CFD技术对参考泵和M型截面流道的内部流动进行多工况三维数值模拟分析,对比两者之间的扬程、效率曲线,并分析流道截面的流线图。结果表明,相比矩形流道,M型截面流道在扬程和效率上均有所提升,流道内叶片出口处的乱流有所改善,M型截面流道中液流更加平滑,但是过流面积增加,摩擦损失也随之增大。

Effects of Channel with M-type Section on the Performance of Vortex Pump

An M-type section had been designed to reduce internal shock losses in the channel of votex pump. The reasonable M section was based on the theory of the same area, with the constant height, section of channel sharped like an M was more in line with law of fluid flow. The nearest distance of the wall of channel and the outlet of blades was 1mm. In order to research the inner flow in channel, computational fluid dynamics software CFX was adopted in the inner flow field analysis. Head, efficiency curve and velocity vector of rectangular and M-type channel were obtained from the simulation. The results show that the head and efficiency have improved; fluid flows more smoothly in the M-type channel; turbulence and small reverse spiral at the outlet of blades is less. However, the friction losses increase with the larger flow area.