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| Numerical simulation of the liquid-solid two-phase flow mixture on sludge with shifted propeller |
| ZHU Gui-hua， MA Kai， TANG Xiao， GAO Ming-quan， ZHU Hong-bin |
| School of Mechanical and Electrical Engineering， Central South University， Changsha 410083， China |
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Abstract In order to expand the stirring region and destroy the mixed isolation region in the stirrer, a novel shifted propeller was carried out based on the mixing theory and the design principle of pitch. Computational fluent software was applied to the study of 3D flow field driven by stirrers composed of shifted six blade propeller (6SBP) and ordinary 6BP respectively in sludge. The flow pattern, velocity distribution and power consumption in stirred tank with two different propellers were extensively analyzed and compared by simulation which were verified by experimental test. The results showed that the values of numerical simulation and the experimental measurement of power consumption were in good agreement, and isolation region was destroyed and the stirring region was enlarged by the asymmetric structure in flow field of 6SBP propeller. The radial and axial velocity distributions of 6SBP were clearly superior to those of 6BP at agitation speed of 3 r/s, while its power consumption was about 77% of that of 6BP agitation.
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Received: 22 July 2014
Published: 28 February 2015
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错位桨对污泥固液两相流混合的数值模拟
为了提高搅拌器的搅动范围、减小流动死区，基于混合理论和等螺距的设计原理，提出了一种错位叶片的结构形式．采用Fluent软件对错位桨搅拌器（6SBP）和普通6BP搅拌器在污泥液体中的流场变化进行了三维数值模拟，模拟分析比较了6SBP桨和6BP桨式两种搅拌器的流场形态、速度分布和功耗的特点，并通过实验进行了验证．结果表明，模拟结果和实验结果较吻合，错位桨搅拌流场不对称，能够减小流动死区，增大搅动范围．在N=3 r/s的工作状态下，6SBP桨的轴向速度和径向速度分布要大于6BP桨，而功耗约为6BP桨的77%．
关键词：
错位桨,
数值模拟,
速度场,
速度分布,
流动死区,
湍流模型
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