铝熔体搅拌过程中搅拌功率特性的分析
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摘要
根据相似原理推导三层桨叶功率影响因素关联式,应用Fluent软件对铝熔体搅拌过程中的搅拌功率特性进行模拟分析,研究工艺参数和桨叶结构对搅拌功率的影响。分析结果表明:搅拌功率与搅拌转速的三次方成正比;搅拌功率随铝熔体温度的升高而降低,铝熔体温度升至1 073 K时搅拌功率变化趋于平缓;搅拌功率随桨叶倾角的增大而降低,倾斜角为0°时最大;此外,桨叶浸入深度和桨叶层间距对搅拌功率也有一定的影响。
Based on the similarity principle, the correlation formula of power influencing factors of three-layer blades was deduced. Fluent software was used to simulate and analyze the stirring power characteristics of molten aluminum and the effect of processing parameters and blade structure on stirring power was studied. The analytic result shows that the stirring power is proportional to the third power of the stirring speed. The stirring power decreases as the temperature of the molten aluminum rises, and the stirring power changes gently as the temperature of the molten aluminum rises to 1 073 K. Stirring power decreases with increased blade rake angle, and reaches the maximum value when the blade rake angle is 0°.Furthermore, the blade immersion depth and the blade layer spacing also have a certain influence on the stirring power.
Based on the similarity principle, the correlation formula of power influencing factors of three-layer blades was deduced. Fluent software was used to simulate and analyze the stirring power characteristics of molten aluminum and the effect of processing parameters and blade structure on stirring power was studied. The analytic result shows that the stirring power is proportional to the third power of the stirring speed. The stirring power decreases as the temperature of the molten aluminum rises, and the stirring power changes gently as the temperature of the molten aluminum rises to 1 073 K. Stirring power decreases with increased blade rake angle, and reaches the maximum value when the blade rake angle is 0°.Furthermore, the blade immersion depth and the blade layer spacing also have a certain influence on the stirring power.
引文
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[8]HOUCINE I, PLASARI E, DAVID R. Effects of the Stirred Tank's Design on Power Consumption and Mixing Time in Liquid Phase[J]. Chemical Engineering&Technology,2000,23(7):605-613.
[9]杨德辽,陈良才,闫海珍.氮气-液体石蜡混合液中搅拌功率的实验研究[J].化学工程与装备,2009(3):20-23.
[10]都荣礼,黄雄斌,王昕,等.侧伸式气液搅拌槽内的搅拌功率与传质性能[J].过程工程学报,2008,8(4):709-713.
[11]丁健华,马腾,陈涛,等.搅拌釜内流场三维数值模拟及功率预测[J].化工装备技术,2015,36(1):19-22.
[12]杨含离.工程流体力学双语教程[M].北京:国防工业出版社,2015.
[2]骆培成,程易,汪展文,等.液-液快速混合设备研究进展[J].化工进展,2005,24(12):1319-1326.
[3]武启.开启涡轮式桨叶预混机搅拌功率研究[D],武汉:华中科技大学,2016.
[4]CHAPPLE D,KRESTA S M,WALL A, et al. The Effect of Impeller and Tank Geometry on Power Number for a Pitched Blade Turbine[J]. Chemical Engineering Research and Design,2002,80(4):364-372.
[5]BAO Y Y, YANG B, XIE Y, et al. Power Demand and Mixing Performance of Coaxial Mixers in Non-Newtonian Fluids[J]. Journal of Chemical Engineering of Japan,2011,44(2):57-66.
[6]GHOTLI R A,RAMAN A A A. IBRAHIM S,et al. Liquid=liquid Mixing in Stirred Vessels:A Review[J]. Chemical Engineering Communications, 2013, 200(5):595-627.
[7]GHOTLI R A,AZIZ A R A,IBRAHIM S,et al. Study of Various Curved-blade Impeller Geometries on Power Consumption in Stirred Vessel Using Response Surface Methodology[J]. Journal of the Taiwan Institute of Chemical Engineers, 2013, 44(2):192-201.
[8]HOUCINE I, PLASARI E, DAVID R. Effects of the Stirred Tank's Design on Power Consumption and Mixing Time in Liquid Phase[J]. Chemical Engineering&Technology,2000,23(7):605-613.
[9]杨德辽,陈良才,闫海珍.氮气-液体石蜡混合液中搅拌功率的实验研究[J].化学工程与装备,2009(3):20-23.
[10]都荣礼,黄雄斌,王昕,等.侧伸式气液搅拌槽内的搅拌功率与传质性能[J].过程工程学报,2008,8(4):709-713.
[11]丁健华,马腾,陈涛,等.搅拌釜内流场三维数值模拟及功率预测[J].化工装备技术,2015,36(1):19-22.
[12]杨含离.工程流体力学双语教程[M].北京:国防工业出版社,2015.