错位Rushton桨的水动力学特性

发布时间：2018-01-02 05:31

本文关键词：错位Rushton桨的水动力学特性　出处：《华中科技大学学报(自然科学版)》2016年02期 　论文类型：期刊论文

【摘要】：为了揭示错位Rushton桨的混合机理,采用计算流体动力学方法,对层流和湍流水动力学特性进行了研究.首先通过与文献中实验结果的比较,验证了所建数值模型及模拟方法的可靠性,然后重点分析了错位桨搅拌槽内的尾涡、流场和搅拌功耗.结果表明:与标准Rushton桨相比,相同转速时,错位桨能减小尾涡尺寸,降低搅拌功耗,而且桨叶宽度越小越有利,但过低的桨叶宽度不利于增大流体速度及速度分布的均匀程度.相同搅拌功耗时,桨叶宽度为3 D/20和D/5(D为搅拌桨直径)时错位桨的搅拌效果明显优于标准搅拌桨,两者对流体速度提高的幅度相当,但桨叶宽度为3 D/20时的尾涡尺寸小,故为推荐桨叶宽度.
[Abstract]:In order to reveal the mixing mechanism of malposition , the dynamic characteristics of laminar flow and turbulent water are studied by using computational fluid dynamics method . Firstly , compared with the experimental results in the literature , the reliability of the proposed numerical model and the simulation method is verified . The results show that when the same speed is equal to the standard , the displacement paddle can reduce the tail vortex size , reduce the stirring power consumption , and the smaller the blade width is . The results show that when the blade width is 3 D / 20 and D / 5 ( D is the stirring paddle diameter ) , the stirring effect of the misplacement paddle is obviously better than that of the standard stirring paddle , but the tail vortex size is small when the blade width is 3 D / 20 and D / 5 ( D is the stirring paddle diameter ) . Therefore , the blade width is recommended .

【作者单位】：山东大学机械工程学院;山东大学高效洁净机械制造教育部重点实验室;
【基金】：国家自然科学基金资助项目(21306105)
【分类号】：TQ027.2
【正文快照】： 迄今为止,常用的搅拌混沌混合方式有变速搅拌、偏心搅拌、侧入式搅拌、往复式搅拌和错位搅拌.相比于其他搅拌混沌混合方式而言,错位搅拌最易于实现,只须要将叶片上下交错布置即可,无须对搅拌设备做任何改动,便于工业推广应用[1-2].错位搅拌[2-3]使更多的流体能够被拉伸和折叠.

【共引文献】