The effective range of sand-retaining for porous sand screen is the basis for determining their installation locations.In order to clarify the sand-retaining range of porous sand screen,the CFD-DPM numerical simulation method was adopted to conduct wind-sand flow-around tests on 18 types of porous sand screen with different pore sizes,pore spacings,pore shapes,and pore arrangements.The flow traces of sand particles,vortex structures,and flow velocity distributions were analyzed,thereby clarifying the sand-retaining range of porous sand screen and discussing the main factors affecting the sand-retaining range.The results indicate that:(1)When the ventilation rate of the sand screen is too high,the flow field is dominated by laminar flow,leading to poor sand interception effects.(2)When the ventilation rate of the sand screen is too low,sand particles accumulate on the windward side,and intense and disorderly vortices are formed on the leeward side,resulting in poor overall sand-retaining performance.(3)The vertical distance between the low-speed region on the leeward side of the sand screen and the sand screen itself can serve as an intuitive basis for defining the effective sand-retaining range of the sand screen.(4)A predictive formula for the sand-retaining range based on the ventilation rate was proposed,with a correlation coefficient R2 of 0.987 3,meeting the need for rapidly determining the reasonable installation position of perforated sand screen in sand control projects.
关键词
多孔挡沙板/透风率/气固两相流/数值模拟/DPM模型
Key words
porous sand screen/ventilation rate/gas-solid two-phase flow/numerical simulation/DPM model
维普
万方数据