混合元件数对SK型静态混合器流场特性的影响  

Effect of number of mixing elements on flow field in Kenics static mixer

作　　者：龚斌[1] 包忠平[1] 张春梅[1] 吴剑华[1] 

机构地区：[1]沈阳化工学院机械工程学院,辽宁沈阳110142

出　　处：《化工学报》2009年第8期1974-1980,共7页CIESC Journal

基　　金：辽宁省科技攻关项目(2006223001);辽宁省高校创新团队项目(2008T157)

摘　　要：以SK型静态混合器为对象,运用激光多普勒测速仪对混合器内流场进行测量分析,研究混合元件数对混合器内速度分布和湍动性能影响。结果表明:在扭旋叶片作用下,流体在混合器内的速度会重新分布,湍动会被强化,这一过程主要在前3个混合元件中实现,且湍动逐渐增加,但增加速度逐渐减弱,第1个混合元件强化作用最为显著,进入第4个混合元件后基本达到稳定;当混合叶片数量超过3个以后,对流体湍动的强化基本达到混合器强化能力的极限,继续增加元件数量不能提高流体的湍动程度,但可以维持这种湍动。In order to evaluate the influence of number of mixing elements on velocity distribution and turbulence, the flow field inside a Kenics static mixer （KSM） was measured by using laser Doppler veloeimetry. The results showed that the velocity in the KSM was redistributed and the turbulence was strengthened due to the mixing elements. It took place primarily in the first three elements, in which the turbulence was strengthened but the rate of increase fell off along the mixing elements. And more important, the strengthening effect was most significant for the first element and the stabilized state was reached after the fourth element. When the number of the mixing elements was more than three, the limit of strengthening fluid turbulence was reached and the turbulence was no more strengthened by increasing the number of mixing elements.

关 键 词：静态混合器 数值模拟 湍流强度 湍动能 小波变换 

分 类 号：TQ051.7[化学工程]