摘要
电脱水器绝缘棒后端因绕流产生涡街,流速较低,易使原油中高含盐沉积物在该处沉积而导电,以致绝缘棒丧失功用。利用FLUENT对原油电脱水器绝缘棒三维圆柱绕流进行模拟,旨在寻找到有效方案,使漩涡区最小,以提高电脱水器的效率。基于现场原始数据,采用层流模型对三种不同来流速度和结构改进后的流场进行了模拟,分析了不同流速下三维圆柱体绕流各截面漩涡脱落形式及速度分布,得出:速度最大值发生在与来流方向成90°夹角的圆柱上、下两侧,低速区出现在圆柱的背流侧、其后的回流区以及漩涡区;雷诺数的高低会影响柱面的压力梯度及漩涡的形成;背流区面积在一定流速范围内随流速的增大而逐渐减小。绝缘棒添加整流器后低速区明显减少,改变了沉积物的沉积条件。模拟结果可为实际脱水器设计提供一定的参考依据。
The flow around insulating rod in the electric dehydrator is simulated by the software FLUENT, seeking a suitable method to satisfy the smallest zone of vortex and the highest efficiency of electric dehydrator.Based on the original data, flow properities of three different flow speeds and improved structure of electric dehydrator were simulated with laminar flow model. Then the distribution of velocity were analyzed in detail. Maximum speed occurred in the flow direction with 90 angle between the cylinder upper and lower sides. Low-speed occurred in the back side of cylinder, recirculation zone and whirlpool area. Reynolds number affected the cylinder pressure gradient and the formation of vortex. Back flow area decreased gradually with the flow velocity increased.The low speed zone was reduced significantly after installing rectifier, which minished the sediment deposition.By the simulation study, some reference could be provided to the design in practice.
出处
《石油工业计算机应用》
2010年第1期41-42,45,共3页
Computer Applications Of Petroleum
基金
四川省重点学科建设项目(SZD0416)资助
