排灌机械工程学报

作者：LI Qiang, XIA Shengsheng*, YAN Hao

单位：School of Mechanical Engineering, Hefei University of Technology, Hefei, Anhui 230009, China

关键词：long and short guide vane,water-jet pump,hydraulic performance,turbulence kinetic energy

Different guide vane structures will affect the flow inside the pump, and then affect the transformation of the pressure energy and kinetic energy, and change the velocity distribution of the pump outlet. In order to study the influence of long and short guide vanes on the water-jet pump, on the basis of conventional design, we designed eight schemes of guide vane with different vertical heights in the method of computational fluid dynamics for numerical calculation, obtained the perfor-mance curve of water-jet pumps which had different long and short guide vanes, and finally analyzed the influence of different guide vanes on hydraulic performance and internal flow.The results show that all of schemes reducing the height of blade can improve the head and efficiency. In the schemes redu-cing the height on the shroud, the guide vanes that the height of the blade is equal to the height diffe-rence between hub and shroud in impeller have the highest head and efficiency. In all schemes decreasing the blade height, with the increase of the height difference, the velocity increases gradually and the distribution of turbulence kinetic energy becomes more reasonable in the guide vane outlet. The schemes reducing the height on the hub have more reasonable distribution of velocity and turbulence kinetic energy according to schemes reducing the height on the shroud.The guide vanes of long and short blades can be used to stagger the position of the diffusion flow generated by adjacent blades, which can reduce the effect of the velocity circulation and make the flow of the outlet position more stable.

来源：2019年第10期

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