射流孔入射雷诺数对循环射流混合槽内流场特性影响研究
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摘要
采用计算流体力学方法对循环射流混合槽内多孔耦合射流流动特性进行研究,分析射流轴截面内纵向速度分布、中心线速度衰减及其自相似性在不同射流孔入射雷诺数下的变化规律.结果表明:随着射流孔入射雷诺数的增大,三股射流在汇聚区相互卷吸与掺混,逐渐提升纵向速度,导致三股发展为两股射流;射流孔入射雷诺数的增大,减弱了射流中心线速度与初始速度比值的衰减趋势,同时增强了射流轴截面内纵向速度的自相似分布特性.
In this paper,computational fluid dynamics(CFD) method was used to investigate the effect of different Reynolds numbers on the characteristic of coupling of multiple jets flow field in a novel circulating jet tank(CJT).And the variation of jet longitudinal velocity distribution,jet velocity decay and self-similarity in jet cross-sections were analyzed with the increasing of Reynolds number.Results showed that the entrainment and mixing of the three jets enhanced the longitudinal velocity in convergence zone with the increasing of Reynolds number,which led the three jets to develop into two jets.Increasing the Reynolds number not only weakened the ratio of jet centerline velocity to initial jet velocity,but also strengthened the self-similarity characteristic of the jet longitudinal velocity distribution.
In this paper,computational fluid dynamics(CFD) method was used to investigate the effect of different Reynolds numbers on the characteristic of coupling of multiple jets flow field in a novel circulating jet tank(CJT).And the variation of jet longitudinal velocity distribution,jet velocity decay and self-similarity in jet cross-sections were analyzed with the increasing of Reynolds number.Results showed that the entrainment and mixing of the three jets enhanced the longitudinal velocity in convergence zone with the increasing of Reynolds number,which led the three jets to develop into two jets.Increasing the Reynolds number not only weakened the ratio of jet centerline velocity to initial jet velocity,but also strengthened the self-similarity characteristic of the jet longitudinal velocity distribution.
引文
[1]孙宏伟,陈建峰.我国化工过程强化技术理论与应用研究进展[J].化工进展,2011,30(1):1-15.
[2]Jin Y,Cheng Y.Chemical Engineering in China:Past,Present and Future[J].American Institute of Chemical Engineers Journal,2011,57(3):552-560.
[3]Luo P C,Cheng Y,Jin Y,et al.Fast Liquid Mixing by Cross-flow Impingement in Millimeter Channels[J].Chemical Engineering Science,2007,62(22):6178-6190.
[4]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.
[5]孟辉波,王艳芬,禹言芳,等.射流混合设备内混合时间的研究进展[J].化工进展,2012,31(12):2615-2625.
[6]吴剑华.无搅拌混合装置:中国,CN 201110200231.3[P].2011-11-02.
[7]鲁占军,杨春苹,高美蓉,等.浆料罐搅拌器改造总结[J].聚氯乙烯,2003(3):44-45.
[8]Meng H B,Wang W,Wu J H,et al.Experimental Study on Instantaneous Pressure Fluctuation Time Series in the Novel Tank Agitated by Multiple Horizontal Jets[J].Chemical Engineering Research and Design,2012,90(11):1750-1764.
[9]Yu Y F,Wu J H,Meng H B.Numerical Simulation Process Aspects of the Novel Static Circulating Jet Mixer[J].Canadian Journal of Chemical Engineering,2011,89(3):460-468.
[10]禹言芳,吴剑华,孟辉波.循环射流混合槽内瞬态压力波动非线性标度特性[J].过程工程学报,2012,12(5):728-734.
[11]禹言芳,吴剑华,孟辉波.基于局域波分解的循环射流混合槽内压力脉动信号时频特性分析[J].北京化工大学学报(自然科学版),2012,39(6):23-30.
[12]禹言芳,吴剑华,孟辉波.新型循环射流混合器湍流特性分析[J].过程工程学报,2011,11(1):1-8.
[13]Zughbi H D,Rakib M A.Investigations of Mixing in a Fluid Jet Agitated Tank[J].Chemical Engineering Communication,2002,189(8):1038-1056.
[14]Zughbi H D,Ahmad I.Mixing in Liquid-jet-agitated Tanks:Effects of Jet Asymmetry[J].Industrial and Engineering Chemistry Research,2005,44(4):1052-1066.
[15]Jayanti S.Hydrodynamics of Jet Mixing in Vessels[J].Chemical Engineering Science,2001,56(1):193-210.
[16]Patwardhan A W.CFD Modeling of Jet Mixed Tanks[J].Chemical Engineering Science,2002,57(8):1307-1318.
[17]江帆,黄鹏.Fluent高级应用与实例分析[M].北京:清华大学出版社,2008:11-17.
[2]Jin Y,Cheng Y.Chemical Engineering in China:Past,Present and Future[J].American Institute of Chemical Engineers Journal,2011,57(3):552-560.
[3]Luo P C,Cheng Y,Jin Y,et al.Fast Liquid Mixing by Cross-flow Impingement in Millimeter Channels[J].Chemical Engineering Science,2007,62(22):6178-6190.
[4]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.
[5]孟辉波,王艳芬,禹言芳,等.射流混合设备内混合时间的研究进展[J].化工进展,2012,31(12):2615-2625.
[6]吴剑华.无搅拌混合装置:中国,CN 201110200231.3[P].2011-11-02.
[7]鲁占军,杨春苹,高美蓉,等.浆料罐搅拌器改造总结[J].聚氯乙烯,2003(3):44-45.
[8]Meng H B,Wang W,Wu J H,et al.Experimental Study on Instantaneous Pressure Fluctuation Time Series in the Novel Tank Agitated by Multiple Horizontal Jets[J].Chemical Engineering Research and Design,2012,90(11):1750-1764.
[9]Yu Y F,Wu J H,Meng H B.Numerical Simulation Process Aspects of the Novel Static Circulating Jet Mixer[J].Canadian Journal of Chemical Engineering,2011,89(3):460-468.
[10]禹言芳,吴剑华,孟辉波.循环射流混合槽内瞬态压力波动非线性标度特性[J].过程工程学报,2012,12(5):728-734.
[11]禹言芳,吴剑华,孟辉波.基于局域波分解的循环射流混合槽内压力脉动信号时频特性分析[J].北京化工大学学报(自然科学版),2012,39(6):23-30.
[12]禹言芳,吴剑华,孟辉波.新型循环射流混合器湍流特性分析[J].过程工程学报,2011,11(1):1-8.
[13]Zughbi H D,Rakib M A.Investigations of Mixing in a Fluid Jet Agitated Tank[J].Chemical Engineering Communication,2002,189(8):1038-1056.
[14]Zughbi H D,Ahmad I.Mixing in Liquid-jet-agitated Tanks:Effects of Jet Asymmetry[J].Industrial and Engineering Chemistry Research,2005,44(4):1052-1066.
[15]Jayanti S.Hydrodynamics of Jet Mixing in Vessels[J].Chemical Engineering Science,2001,56(1):193-210.
[16]Patwardhan A W.CFD Modeling of Jet Mixed Tanks[J].Chemical Engineering Science,2002,57(8):1307-1318.
[17]江帆,黄鹏.Fluent高级应用与实例分析[M].北京:清华大学出版社,2008:11-17.