Effect of Two Diffuser Types of Volute on Pressure Fluctuation in Centrifugal Pump Under Part-Load Condition

摘要

In this research, two diffuser types of volute were designed, the volute with tangential diffuser and the volute with radial diffuser. Normally, different diffuser types of volute will affect the performance of pump, while in this paper, little effect can be found. Two diffuser types of volute were designed to study the effect on pressure fluctuation features of centrifugal pump under part-load condition, with the same volute design parameters and impeller parameters. The unsteady, three dimensional turbulent flow ifl the pump was simulated. It shows that the periodic features in pressure fluctuation near its tongue are the same for two diffuser types of volute, however in the diffuser of the volute, the values of the pressure fluctuation in radial diffuser is greater than that in tangential diffuser. The results can provide a useful reference for designing the diffuser of volute in centrifugal pump.