Experimental Study on the Performance and Internal Flow Characteristics of Liquid-Gas Jet Pump with Square Nozzle

In order to ascertain the impact of working water flow rate and inlet pressure on the performance of the liquid-gas jet pump with square nozzle, the pumping volume ratio and efficiency of the liquid-gas jet pump with square nozzle were experimentally investigated at different inlet pressures and working water flow rates. Furthermore, the internal flow characteristics of the liquid-gas jet pump with square nozzle were explored through the utilization of visualization technology in the self-designed square-nozzle liquid-gas jet pump experimental setup. The findings indicate that the pumping ratio of the liquid-gas jet pump increases in conjunction with an elevation in the inlet pressure. Liquid-gas jet pump efficiency is higher at lower inlet pressures, up to 42.48%, and drops rapidly as inlet pressure increases. The pumping volume ratio of the liquid-gas jet pump increases significantly as the working water flow rate increases, and the working water flow rate exerts a minimal effect on the working efficiency of the liquid-gas jet pump. In the context of extreme vacuum conditions, a considerable number of droplets undergo substantial reflux in the posterior section of the throat, with a notable absence of bubbles in the diffusion tube. The size and number of bubbles diminish gradually along the axial direction. The objective of this paper is to provide a reference point for determining the optimal operational parameters for a square-nozzle liquid-gas jet pump in a practical context.