CFD research for influence of disk turbine blade on mixing characteristics in stirred tank
CFD research for influence of disk turbine blade on mixing characteristics in stirred tank
复制标题
盘式涡轮叶片对搅拌槽混合特性影响的CFD研究
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
Jiang Huilin
中科院分区：
文献类型：
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作者：
Jiang Huilin
采用CFD数值模拟方法对圆盘涡轮机桨搅拌槽内的浓度场进行了研究。本文主要研究了普通直叶片（90°）和斜叶片（60°和45°）位置对混合时间θm、单位体积混合能Wr和混合浓度标准偏差σ的影响。在标准直叶片安装高度下，模拟转速与实验值吻合较好。研究表明，随着圆盘涡轮机叶片安装高度从标准高度降低，混合槽内的流态由径向流转变为轴向流。当流型转变为轴向流时，90°、60 °和45°桨的相对安装高度（C/H）分别为0.20、0.233和0.267。搅拌时间由罐顶、罐底检测位置决定。标准相对安装高度（C/H = 1/3）不是混合性能的最佳位置。当相对安装高度分别为0.313、0.267和0.320时，90°、60 °和45°叶片的混合性能最佳。综合省时、节能和混合均匀性的优点，45°叶片的效果最好，60 °次之。
Concentration field in the stirred tank with disc turbine paddle was studied by numerical simulation method CFD. This paper mainly investigated the effects of the location of the common straight blade(90°) and inclined blades(60° and 45°) on mixed time θm,mixing energy per unit volume Wr and the concentration standard deviation of mixing σ. The data of simulation speed agreed well with experimental data under the standard installation height of straight blade. The research showed that flow pattern within the mixing tank turns from radial flow into axial flow when the installation height of disc turbine blade is decreased from the standard height. The relative installation height(C/H) of 90°,60° and 45° paddle was 0.20,0.233 and 0.267 respectively when flow pattern turned into axial flow. Mixing time was decided by the top and bottom detection positions of tank. The standard relative installation height(C/H = 1/3) was not the optimal location of the mixing performance. The mixing performance of 90°,60° and 45° blades was optimal when the relative installation height was at 0.313,0.267 and 0.320 respectively. Combing the advantages of saving time, energy and mixing uniformity,blade of 45° was the best and 60o took the second place.