Analysis on Velocity and Pulsation Characteristics of Outlet of the Inlet Conduit of Vertical Axial Flow Pump
In order to study the characteristics of velocity and pressure pulsation at the outlet of the inlet conduit under different flow rate conditions,the three-dimensional unsteady numerical calculation of the vertical axia-flow pump device was carried out based on the CFD software.The time-frequency characteristics of the velocity of each measuring line and the pressure pulsation of the monitoring points were analyzed respectively.The results show that at the outlet of the inlet conduit,the velocity generally shows the law of decreasing first and then increaseing and then decreaseing from the wall of the water guide cap to the inner wall of the conduit.And the amplitude of pressure fluctuation and velocity fluctuation decreases gradually from the rim to the hub.The maximum amplitude of pressure pulsation and velocity pulsation amplitude of each monitoring point at the outlet of the inlet conduit are located at 4 times the rotation frequency.
万方数据
维普
