Evaluation of Geometrical Factors toward the Efficiency of Natural Gas Ejector-Booster System by CFD Simulation
Abstract
The geometrical parameters of the ejector significantly affect its performance in boosting the flow from low-pressure gas wells. Several studies have identified that primary nozzle exit position (NXP), primary nozzle exit diameter (Dp), and mixing tube diameter (Dmt) are among the most influential factors. In this study, computational fluid dynamics (CFD) simulation is used to investigate the effect of these parameters on the entrainment ratio and isentropic efficiency of the ejector, especially by analyzing the velocity and pressure field inside the ejector. After model construction and validation against published data, we found that the optimum ejector is achieved at geometry configuration of NXP/Dt = 6.346, Dmt/Dt = 2.615, and Dp/Dt = 1.275. The maximum entrainment ratio and corresponding ejector efficiency at optimum geometry are 76.3% and 29.6%. The optimum geometry is obtained when the double choking flow forms inside the mixing chamber as indicated by the velocity and pressure profiles. These findings align with our previous study, further emphasizing the impact of flow profiles on ejector performance.
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