搅拌釜内双层改进型INTER-MIG桨流场实验研究

为得到双层INTER-MIG桨搅拌釜内流场特征，文章采用粒子图像测速技术(PIV)对直径为430 mm的双层改进 型INTER-MIG桨搅拌槽内流场进行了实验研究。分析了搅拌转速、相位角及轴向位置对搅拌槽内流场分布的影响。结 果表明：整个流场表现出较强轴流特性，底桨右端形成一个漩涡；转速增加引起桨叶附近湍动增强，但整体流型变化不 大；当r/R <0.48时，桨叶间轴流效果显著，有利于釜底流体向上抬升，增强整体混合效果；当r/R>0.48时，桨叶右端在 近壁面处会形成上下2股流动流体，有助于形成局部区域循环。实验结果可为工业搅拌过程提供工艺参考。

Experimental Investigation of Flow Dynamics in Stirred Tank with Dual Improved INTER-MIG Impeller

The flow characteristics in a stirred vessel with a diameter of 430 mm agitated by double INTER-MIG impellers were experimentally investigated by particle image velocimetry ( PIV). The effects of the rotational speed, the phase angle and the axial position on the flow pattern were analyzed. The PIV results showed that the axial flow was strong in the tank and a circulation formed at the right of the lower paddle. The turbulence increased with the increase of rotational speed, while the whole flow stayed almost unchanged. When r/R was less than 0. 48, the axial flow was strong, which benefited the lift of the flow in the down vessel and the mixing effect. When r/R was larger than 0.48 , the flow was separated into up and down nearby the wall of the tank, which benefited the form of the local circulation. The results can provide reference to the industrial mixing process.