摘要
对链状高分子聚合物进行球-棍模型简化,使得在描述其减阻机理时更加直观形象。利用流体流动控制方程和高分子本构方程进行直接数值模拟,根据模拟结果研究聚合物的主要减阻机理。在湍流条件下,聚合物反向扭矩从根本上抑制了湍流发卡型漩涡的迸发和再生,进而减少流体的湍流脉动及流动阻力损失。其中,聚合物的正向扭矩作用在发卡型漩涡的拱形头部和第2个发卡型漩涡的腿部,抑制湍流漩涡的迸发频率和强度,减少新的发卡型漩涡的生成;聚合物的反向扭矩作用在发卡型漩涡的卷曲方向,可以减小漩涡的弯曲率和倾斜角度。
This research simplifies a ball-stick model for chain polymers to make their drag reduction mechanism description more visual.It performs direct numerical simulation with fluid flow control equation and polymer constitutive equations,and studies main drag reduction mechanism of polymers based on the simulation results.The polymer's reverse torque under turbulent condition fundamentally inhibits the burst and regeneration of turbulence hairpin vortex,thereby reducing the drag loss of turbulent fluctuation and flow of the fluid.In which the polymer positive torque is acting on the arched head of hairpin vortex and the leg of the second hairpin vortex,inhibiting the burst frequency and intensity of the turbulent vortex,thus reducing the generation of new hairpin vortex.The polymer's reverse torque is acting in whirling direction of hairpin vortex,which can reduce the curved ratio and tilt angle of the vortex.
出处
《油气储运》
CAS
2012年第12期895-897,968,共3页
Oil & Gas Storage and Transportation
基金
十一五国家科技重大专项"塔里木盆地大型碳酸盐油气田勘探开发示范工程"
2008ZX05049-004-009HZ
关键词
高分子聚合物
扭矩
湍流漩涡
减阻机理
动态模拟
polymers,torque,turbulent vortex,drag reduction mechanism,dynamic simulation
