单涡旋式水流清洗机流场特性分析

Flow field characteristics analysis of single vortex water washer

对具有U型清洗槽的单涡旋式果蔬水流清洗机,涡旋式水流清洗强化特性进行数值研究,探讨U型清洗槽内横纵孔淹没水射流形成单涡旋水流清洗动力的规律,及涡旋流对清洗湍流强化作用。通过对不同的横纵孔射流流量比下清洗槽内三维流动的数值进行模拟,计算结果表明:横纵射流流量决定了单涡旋形成的三维分布和强度;纵向射流的水平位置,影响横纵射流的相互作用强度,射流位置距离近相互作用强,形成涡旋流动显著,促进对单涡旋向出口下游的迁移;涡旋流形成区具有较高的湍流强度,表明具有显著清洗强化作用。

The fluid dynamic characteristic of vortex flow washing in a fruits and vegetables washer unit with U-shaped structure was investigated by three-dimensional Computational Fluid Dynamic simulation（CFD）.The single vortex flow formed by longitudinal and transverse water jet in washer unit was simulated at different flux rates of longitudinal and transverse water jet.The vortex flow dynamic characteristic in water unit and the effect of vortex flow on strengthening turbulent washing were discussed.The simulation results shows that flux rate has a dominant effect on vortex flow spacious distribution and intensity;the interaction between longitudinal and transverse water jet is controlled by location of longitudinal jet;when longitudinal jet appears near transverse jet the interaction occurs significantly and is benefit to transport washing flow towards outlet;vortex flow region appears high turbulent intensity to enhance the washing micro dynamic.