Experimental research and numerical analysis for effect of drainage structure on separation performance and the “blockage” of fluid in nozzle

Abstract

ABSTRACT Supersonic separation technology is a cutting-edge method for efficient dehydration and hydrocarbon removal, yet challenges arise from the intricate flow dynamics within a supersonic nozzle. To address these challenges, a novel cascade drainage structure is proposed in this paper, combining the high swirl intensity of flush-type drainage with the extended drainage section, larger opening area, and reduced flow velocity of cylindrical drainage with oblique openings. Through comprehensive physical modeling and numerical analysis, this design is shown to enhance separation performance and mitigate fluid blockage within the nozzle. Through physical modeling and numerical analysis, we demonstrate its effectiveness in enhancing separation and mitigating fluid blockage. Experimental results confirm the cascade drainage structure’s superiority, particularly at an optimal pressure ratio ( R np = 1.4). Ethanol vapor removal rate ( δ steam ) and dew point drop ( Δ T d ) reach 53.94% and 18.32°C, respectively, surpassing alternatives. Maintaining a 2 mm discharge clearance yields an outstanding dry gas ratio of approximately 85%. The findings contribute to advancements in dehydration and hydrocarbon removal processes, showcasing the potential for enhanced performance in supersonic separation technology within a concise framework.