Abstract
A self-priming centrifugal pump can be used in various areas such as agricultural irrigation, urban greening, and building water-supply. In order to simulate the gas-water two-phase flow in the self-priming process of a self-priming centrifugal pump, the unsteady numerical calculation of a typical self-priming centrifugal pump was performed using the ANSYS Computational Fluid X (ANSYS CFX) software. It was found that the whole self-priming process of a self-priming pump can be divided into three stages: the initial self-priming stage, the middle self-priming stage, and the final self-priming stage. Moreover, the self-priming time of the initial and final self-priming stages accounts for a small percentage of the whole self-priming process, while the middle self-priming stage is the main stage in the self-priming process and further determines the length of the self-priming time.
Highlights
A pump is a kind of general machine with tremendous variety and extensive application fields, and it can be said that pumps serve in all places with liquid flow [1,2,3,4]
Using the Fluent software, Liu et al [21,22] made a numerical calculation of the gas-water two-phase flow in the self-priming process of a single-stage self-priming centrifugal pump, and the pressure, velocity and gas distribution of the flow field under different assumed void fraction conditions were obtained
When t > 4 s, the water in the inlet section flowed into the impeller in the final self-priming stage, causing the drainage capacity of the impeller to increase sharply
Summary
A pump is a kind of general machine with tremendous variety and extensive application fields, and it can be said that pumps serve in all places with liquid flow [1,2,3,4]. Wang et al [19,20] adopted an inlet void fraction of 15% for the self-priming process of rotational flow of a self-priming pump using Fluent software. Using the Fluent software, Liu et al [21,22] made a numerical calculation of the gas-water two-phase flow in the self-priming process of a single-stage self-priming centrifugal pump, and the pressure, velocity and gas distribution of the flow field under different assumed void fraction conditions were obtained. Li et al [23,24] simulated the gas–liquid states in a pump at different moments (initial, middle, and late stages) of the self-priming process using the quasi-steady method with a decreased void fraction, and estimated the time required for the entire self-priming process. A typical self-priming centrifugal pump was designed, and a numerical calculation of the gas-water two-phase flow in the self-priming process was performed using the ANSYS CFX
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