Optimization of the Liquid Gas Ejector in Low Pressure Gas Wells Based on Response Surface Method
Through 3D numerical simulation of the two-phase flow in the liquid-gas ejector of low-pressure gas wells,it is found that the liquid-gas mixing mainly occurs in the position from the nozzle to the first half of the mixing throat,and the mixing throat size and the nozzle position affect the liquid-gas mixing effect.In order to improve the ejective performance of liquid-gas ejector,based on numerical simulation,the flow ratio of ejector was taken as the optimization objective,and four main structural parameters(the length-diameter ratio of mixing throat,throat-nozzle distance,the area ratio of throat-nozzle and the diffusion angle of diffusion tube)were taken as design factors for optimization analysis.The results of the single factor optimization analysis show that the flow ratio is increased by 4.92%.Based on this,Box-Benhnken experimental was designed,and the response surface model of design factors and flow ratio was established.Through variance analysis and response surface analysis,it is found that the significant factors affecting the flow ratio are throat-nozzle distance,the area ratio of throat-nozzle and the diffusion angle of diffusion tube,and there is interaction between the influ-ence of each design factor on the flow ratio,among which the interaction between the area ratio of throat-nozzle and throat distance is significant.Through the response surface model,the optimal scheme is obtained,which improves the flow rate by 8.49%,and the optimi-zation effect is obviously better than the single factor optimization result.
liquid-gas ejectorlow pressure gas wellnumerical simulationstructure optimizationresponse surface method
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