Study on the integrated self-priming process of a vehicle-mounted self-priming pump

Area of Science:

• Fluid Mechanics
• Mechanical Engineering
• Pump Technology

Background:

• Self-priming pumps are crucial in mobile applications, but their priming characteristics require detailed understanding.
• Previous studies often lack detailed simulation of the dynamic priming process.

Purpose of the Study:

• To explore and analyze the self-priming characteristics of a self-priming pump in a mobile pump truck setup.
• To identify and characterize the distinct stages of the self-priming process.

Main Methods:

• Established a 3D circulatory piping system model for the self-priming pump.
• Utilized User Defined Functions (UDF) for simulating impeller acceleration and speed changes.
• Employed Volume of Fluid (VOF) and Realizable k-ε turbulence models for coupled numerical simulation of unsteady incompressible viscous flow.

Main Results:

• The self-priming process was divided into four stages: rapid suction, shock exhaust, rapid exhaust, and residual gas discharge.
• The duration of each stage showed an increasing trend within the total priming time.
• Observed specific water level rise patterns during rapid suction and gas distribution within the pump during shock exhaust.
• Identified significant energy losses at the impeller's inlet and outer edge regions.

Conclusions:

• The four-stage model provides a comprehensive understanding of the self-priming pump's operation.
• Understanding gas-liquid two-phase flow dynamics is key to optimizing self-priming pump performance.
• Energy loss analysis highlights areas for potential design improvements in impeller geometry.