【摘要】 运用CFD技术研究了泛能式桨在高黏假塑性流体中的搅拌混合特性。重点考查了搅拌桨的上、下叶片错开角和下叶片后掠角在不同组合下对混合过程的影响,包括搅拌流场的分布、功耗特性、泵送准数、死区分率、剪切速率和表观黏度。结果表明:功耗与错开角和后掠角成反比,这与文献报道的实验结果相同。流场分布为双循环流型,且受到错开角和后掠角的影响。错开角和后掠角存在最佳的组合方式60°-60°,使得相对功耗小,泵送准数大,死区分率小。更多还原

【Abstract】 The mixing characteristics of Fullzone agitator were studied by computational fluid dynamics techniques( CFD) in highly viscous pseudoplastic fluid. The combination influence of stagger angle( up and down blade) and sweepback( down blade) of impeller on the mixing process was investigated,including distribution of mixing flow field,power consumption,pumping number,dead zone fraction,shear rate and apparent viscosity. The result shows that power consumption is inversely proportional to sweepback and stagger angle of impeller,which is consistent with that reported in literatures. The double circulation type flow field is influenced by the stagger angle and sweepback of impeller. The optimum combination of stagger angel and sweepback( 60°- 60°) results in low power consumption,large pumping number and small dead zone fraction for impeller.更多还原