六斜叶圆盘搅拌桨的龙卷流型搅拌效能分析  

Effect analysis in tornado flow stirred vessel with six oblique leaf disc impeller

作　　者：梁佳赟 王杰[1] 郝惠娣[1] 杨斌[1] 

机构地区：[1]西北大学化工学院,西安710069

出　　处：《中国科技论文》2016年第23期2667-2671,共5页China Sciencepaper

基　　金：高等学校博士学科点专项科研基金资助项目(20116101120027);陕西省自然科学基础研究计划青年人才资助项目(2013JQ2001);陕西省工业攻关资助项目(2011K10-21)

摘　　要：为了分析中心龙卷流型搅拌槽(六斜叶圆盘搅拌桨)的搅拌效果,应用CFD数值模拟了其与标准搅拌槽的内部流场,对比分析了二者的流动特性及能效差异。结果表明:在龙卷流型搅拌槽中心区域内工质螺旋形上升,循环区域增大,全槽返混效果较好;同时在搅拌槽底部中心区域形成5个分散的旋涡,可减少槽底部颗粒沉积,有效消除了罐中央的"圆柱状回转区;中心龙卷流型搅拌槽内搅拌工质产生的湍动能远大于标准搅拌槽,甚至在底部二者整体差异可在2倍以上,意味着中心龙卷流型搅拌槽混合更充分,搅拌更均匀;此外,与标准搅拌槽相比,中心龙卷流搅拌槽耗能较低,搅拌桨在同转速下的搅拌功率和功率准数为标准搅拌槽的94.7%。In this paper the flow fields in central tornado flow stirred vessel （CTFSV） and standard stirring vessel （SSV） with similar six oblique blade discs paddle were evaluated by numerical simulation. Campared with SSV, the results show that in cen-ter region of CTFSV the working fluid move in ascending spiral path, and the circular flow region in CTFSV is larger than that of SSV. Therefore, the whole backmixing effect of CTFSV is better than that of SSV. Moreover, there are five dispersed vertoxes on center region of CTFSV？s bottom, which could reduce grains deposit on the bottom and avoid the formation of cylindrical rota-ry area. It could also be found that the turbulent kinetic energy in CTFSV is greater than that in SSV. Especially, it could be double on the vessel bottom. It means that CTFSV works much better than SSV in mixing woking materials. Furthermore, by comparing both vessels’ power and power number, it represents that CTFSV’s energy consumption is lower than that of SSV, almost equal to 94. 7% of SSV＇s energy consumption.

关 键 词：搅拌 数值模拟 对数螺旋导流板 湍动能 功率准数 

分 类 号：TQ051.72[化学工程]