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Effect of volute structure on radial force characteristics of centrifugal pump during startup
Author(s): Runze Zhou, Jingjiang Yang, H. L. Liu, Liang Dong
Keywords: centrifugal pump, volute structure, numerical simulation, startup process, radial force
In order to research the effect of the volute structure on the radial force characteristics of the centrifugal pump during the starting process, a centrifugal pump with a specific speed of 92.8 is chosen as the research object. The pumping chamber is redesigned into a single-volute and a double-volute with similar external characteristics, and a circulation pipeline system is established. RNG k-ε turbulence model is employed to calculate the unsteady starting process of two kinds of centrifugal pumps. The variation trends of radial force received by the impeller and volute during the start-up process are obtained. The radial force characteristics and internal flow field evolution of two centrifugal pumps are compared and analyzed. The results show that the radial force vector distribution of the impeller changes in spiral periodicity during the startup process, and the spiral structure is influenced by the number of impeller blades. The spiral direction is opposite to the impeller. The double-volute structure can effectively reduce the radial force and pulsation amplitude of the impeller during the start-up process of the centrifugal pump, but the radial force vector distribution of the double-volute is more complicated and disordered than the single-volute.

Journal of Applied Fluid Mechanics

The Journal of Applied Fluid Mechanics (JAFM) is an international, peer-reviewed journal which covers a wide range of theoretical, numerical and experimental aspects in fluid mechanics. The emphasis is on the applications in different engineering fields rather than on pure mathematical or physical aspects in fluid mechanics. Although many high quality journals pertaining to different aspects of fluid mechanics presently exist, research in the field is rapidly escalating.