A Numerical Study on the Effect of the Backflow Hole Position on the Performances of a Self-Priming Pump
Dongwei Wang1,*, Lijian Cao1, Weidong Wang2, Jiajun Hu1
1
School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, 730050, China
2
Sanlian Pump Industry Co., Ltd., Ma’anshan, 243000, China
*
Corresponding Author: Dongwei Wang. Email: wangdongweibaby123@163.com
Fluid Dynamics & Materials Processing https://doi.org/10.32604/fdmp.2023.042654
Received 07 June 2023; Accepted 13 October 2023; Published online 07 December 2023
Abstract
A self-priming pump is a centrifugal pump that has the ability to prime itself. Typically, its performance depends
on the configuration of its reflux hole. In this study, the ANSYS FLUENT software is used to investigate the effects
of three different radial positions of the reflux hole on gas-liquid two-phase distribution, pressure pulsation, and
imp during self-priming. The research results indicate that: (1) The effective channel size for the reflux liquid to
enter the volute varies depending on the location of the reflux hole. The effect of the impeller rotation on the
reflux liquid becomes more obvious as the setting distance of the reflux aperture decreases. (2) The position of
the reflux hole significantly affects the gas phase mass fraction inside the impeller, resulting in a significant reduction in the time it takes for the mass fraction to exceed 80%. (3) The position of the reflux hole significantly affects
the average pressure on each monitoring surface. (4) Placing the reflux hole at a excessively distant radial distance
can result in an excessive vertical component. (5) The self-priming performance of the pump can be improved to
some extent by placing the return hole at a small radial distance.
Keywords
Self-priming pump; self-priming time; numerical calculation; gas-liquid two-phase flow
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