Experimental studies on the upward flow characteristics of high-pressure gas and water in small-diameter vertical pipes

摘要

Considering the new applications of high-pressure gas pumps in practical engineering, the gas-liquid two-phase flow in small-diameter vertical pipes of the system in this study was tested. The gas volumetric flow rate, water volumetric flow rate, and working efficiency at different submergence height, pressure, and head values were measured. The results revealed that the pressure of high-pressure gas determines the gas consumption of the device and that a linear relationship exists between them. The void fraction of the vertical pipe effectively reflects the mixing of gas and water and affects the pumping capacity of the system. The water volumetric flow rate and working efficiency of the system reach their maximum values simultaneously when the void fraction reaches beta(0), which is a fixed value. A smaller diameter of the gas inlet pipe d enables the pump water efficiency to reach its peak at a lower pressure. We also present an optimization scheme for the selection of the diameter of vertical pipe D. These findings help facilitate a better understanding of the mechanism of the phase distribution and the interaction of the gas-water phases with each other in small-diameter vertical pipes and provide the basis for experiments to further improve the device performance. Published under license by AIP Publishing.