流量对SK型静态混合器湍流性能影响的实验研究

以SK型静态混合器为研究对象，运用激光多普勒测速仪对管内流体的三维脉动速度进行测量并对测量数据进行分析处理. 结果表明，进口流量变化对截面上时均速度分布规律、脉动均方根分布规律及雷诺应力分布规律的影响不大；进口流量增加使径向、轴向及周向上的速度脉动均增加，对径向上的速度脉动强化作用最显著，特别当雷诺数超过6400后，径向上的速度脉动均方根及湍流强度随流量增加而增加的幅度都迅速提高，此时湍动能也迅速提高；雷诺应力随流量的增加而增加，其分量txy和txz增加的幅度高于tyz，特别当雷诺数超过6400后，txy增加的速度迅速提高.

Experimental Study on Turbulence Properties in a Kenics Static Mixer

The three-dimensional pulsating velocity distribution of fluid in a Kenics static mixer was measured by using laser Doppler velocimetry. The analysis of experimental data shows that the influences of inlet flow rate on the distributions of pulsating velocity, turbulence intensity, and Reynolds stress are less. But the radial component, axial component, and circumferential component of pulsating velocity are enhanced with inlet flow rate increasing, especially for its radial component. When Reynolds number is above 6400, square root mean of pulsating velocity, radial turbulence intensity, turbulence kinetic energy increase distinctively with the increase of inlet flow rate, Reynolds stress is enhanced with the flow rate increasing, and more significant incremental change is seen for the components of txy and txz than that for tyz, txy increases rapidly when Reynolds number is above 6400.