The Effect of Long-to-short Radius Ratio on the Performance of Asymmetric Rotor Pump
To enhance the conveying performance and force conditions of the pump,a new structure of an asymmetric rotor pump is proposed.The mathematical model of the asymmetric rotor is established,and the influence of the long-to-short radius ratio of the rotor pump on its performance is studied through CFD numerical simulation.The study indicates that the long-to-short radius ratio has a significantly affects on the fluid flow condition,flow pulsation characteristics,and rotor force within the pump cavity.With the increase of long-to-short radius ratio,the fluid flow velocity in the pump cavity gradually increases,the number of vortices initially decreases first and then increases,the radial force of main rotor gradually increases,when the long-to-short radius ratio is 1.52,the mean radial force increases by 26.9％ compared with the ratio is 1.12,the volumetric efficiency increases gradually,the secondary pulsation of the export flow rate is effectively suppressed and the flow pulsation coefficient decreases first and then increases.When the long-to-short radius ratio is between 1.28～1.44,the volumetric efficiency of the pump is higher,the flow inside the pump ccavity is smoother,and the force on the rotor is better.This provides a theoretical basis for optimizing the design of rotor pumps by using an asymmetric structure and adjusting the long-to-short radius ratio.
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