混流泵启动过程中的水动力瞬态特性研究

In order to study the hydrodynamic transient characteristics of the mixed-flow pump during the start-up process, numerical simulation was carried out by establishing a three-dimensional model of the mixed-flow pump, and the pressure field and flow field changes in the mixed-flow pump during the start-up process were analyzed. The frequency spectrum method was used to study the pump operation. Process the pressure pulsation of the fluid in the impeller channel and the guide vane channel, as well as the change of the radial force of the impeller and the guide vane. The analysis shows that: during the start-up process, the pressure in the pump gradually increases, and the vortex is gradually generated at the guide vanes in the pump, and the size of the vortex continues to increase until the vortex separates; after reaching the rated speed, the fluid pressure in the pump pulsates periodically. At the same time, the radial force of the impeller and the guide vane also changes periodically; the dynamic and static interference of the impeller and the guide vane is the main factor that generates periodic pressure pulsation and radial force in the pump; the pressure pulsation change of the impeller channel and the impeller diameter The direction force is affected by the rotation frequency of the impeller and the number of vane blades; the pressure pulsation change of the guide vane channel and the radial force of the guide vane are affected by the rotation frequency of the impeller and the number of impeller blades.