Numerical Study on the Cavitation Characteristics of Micro Automotive Electronic Pumps under Thermodynamic Effect

Abstract

In order to study the influence of thermodynamic effects on the cavitation performance of hydromechanics, the Singhal cavitation model was modified considering the influence of the thermo-dynamic effects, and the modified cavitation model was written into CFX using the CEL language. Numerical simulation of the cavitation full flow field at different temperatures (25 °C, 50 °C and 70 °C) was carried out with the automotive electronic water pump as the research object. The results show that the variation trend of the external characteristic simulation and experimental values is the same at all flow rates, and the calculation accuracy meets the subsequent cavitation demand. With the increase in temperature, the low-pressure area inside the automotive electronic pump’s impeller decreases. NPSHr decreases and the cavitation resistance is enhanced. During the process of no cavitation to cavitation, the maximum pressure pulsation amplitude in the impeller channel gradually increases. The generation and collapse of cavitations cause the change of pressure pulsation in the internal flow field, causing pump vibration.

The Influence of Different Working Fluid Temperatures on the Hydraulic Performance of Magnetic Vortex Pumps

“…Sojoudi et al [23] selected multiple centrifugal pumps to measure the temperature variation of the outlet nozzle during load operation and established a temperature rise relationship applicable to various centrifugal pumps. Wu Kaipeng et al [24] performed numerical simulations of the full cavitation flow field of automotive electronic water pumps at 25 • C, 50 • C, and 70 • C. Li Wei et al [25] studied the cavitation performance of engine-cooling water pumps at different temperatures and found that as the temperature increased from 25 • C to 70 • C, the cavitation area within the impeller expanded. Li Donglin et al [26] developed a thermodynamic model for a water-lubricated axial piston pump.…”

Editorial for the Special Issue on Micro/Nano Structures and Systems: Analysis, Design, Manufacturing, and Reliability

“…To understand the impact of thermodynamic conditions on hydromechanical cavitation, a modified Singhal cavitation model was developed by Wu et al [ 10 ] that considers thermodynamic effects. Using this model, numerical simulations were performed on a full flow field of an automotive electronic water pump at different temperatures (25 °C, 50 °C, and 70 °C).…”