过渡流下交叉布置圆柱列的可视化实验研究
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摘要
为了保证缩小管径后的换热器空气侧换热性能良好,研究过渡流下不同雷诺数(Re=120, 150, 200),不同横向间距(PS/D=2, 3, 4, 5, 6)的叉排圆柱列的流动特性,为紧凑型热交换器的进一步优化打下理论基础。采用PIV二维粒子图像测速系统对过渡流下不同工况的叉排圆柱列进行可视化实验研究。结果表明,P_S及Re的变化对上游和下游圆柱的涡量场、速度相关量有不同的影响。Re一定时,随着P_S的增大,下游对上游的整流作用逐步削弱。P_S一定时,随着Re的增大,整流效果越来越不明显。Re一定时,每组P_S下的速度比值曲线都呈现出"速度恢复"现象。并且随着P_S的增加,上游圆柱对下游圆柱来流速度所起到的加速效果逐步加强。
The aim of this study is to provide theoretical guidance for the design and optimization of compact heat exchanger by investigating the flow characteristics of the offset cylinder arrays in transitional flow state. The two-dimensional particle image velocimetry(PIV) is adopted in visualization experiments.This research mainly focuses on offset cylinder arrays models in different transverse spacing(P_S/D= 2, 3, 4, 5, 6) and different Reynolds number(Re = 120, 150, 200) in the condition that longitudinal spacing is particular(P_T/D = 2.5). The results show that Re and Ps have a different impacts on the flow characteristics of this model. With the increase of Ps, rectifying effect caused by the downstream cylinders gradually weakens in the case of constant Re. With the increase of Re, rectifying effect becomes weaker in the case of constant P_S. The acceleration effect strengthens firstly and then weakens in each Ps in the case of constant Re,which shows the characteristic of speed recovery. With the increase of Ps, the acceleration effect on downstream cylinders inflow velocity gradually strengthens.
The aim of this study is to provide theoretical guidance for the design and optimization of compact heat exchanger by investigating the flow characteristics of the offset cylinder arrays in transitional flow state. The two-dimensional particle image velocimetry(PIV) is adopted in visualization experiments.This research mainly focuses on offset cylinder arrays models in different transverse spacing(P_S/D= 2, 3, 4, 5, 6) and different Reynolds number(Re = 120, 150, 200) in the condition that longitudinal spacing is particular(P_T/D = 2.5). The results show that Re and Ps have a different impacts on the flow characteristics of this model. With the increase of Ps, rectifying effect caused by the downstream cylinders gradually weakens in the case of constant Re. With the increase of Re, rectifying effect becomes weaker in the case of constant P_S. The acceleration effect strengthens firstly and then weakens in each Ps in the case of constant Re,which shows the characteristic of speed recovery. With the increase of Ps, the acceleration effect on downstream cylinders inflow velocity gradually strengthens.
引文
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[8]张园园,喜冠南.过渡流状态下5列叉排圆柱列流动传热特性研究[J].中国科技论文,2016, 11(11):1291-1294. 1320ZHANG Yuanyuan, XI Guannan. Study on Flow and Heat Transfer Characteristics of Five Offset Cylinder Arrays in Transitional Flow[J]. China Sciencepaper, 2016,11(11):1291-1294. 1320
[9] YAN Shifeng, Cai Chunsen, ZHOU Shaodong et al. Study on Fow and Heat Transfer Characteristics of Offset Cylinder Arrays in Transition Flow[J]. Journal of Engineering Thermophysics, 2013, 34(10):1948-1951
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[11]欧阳新萍.叉排与顺排套片式换热器的热力性能对比研究[C]//上海市制冷学会二○○三年学术年会论文集,上海市制冷学会,2003OUYANG Xinping. Contrast Study of Heat Transfer and Resistance Performance of Plate Fin Heat Exchangers with Cross Flow&Direct Flow[C]//Proceedings of the Annual Academic Year of Shanghai Institute of Refrigeration, Shanghai:Shanghai Institute of Refrigeration, 2003
[12] Ostanek J K, Thole K A. Wake Development in Staggered Short Cylinder Arrays within a Channel[J]. Experiments in Fluids, 2012, 53(3):673-697
[2]邹帅,周杰,徐加辉,喜冠南.过渡流下串列双圆柱周期传热机理研究[J].机械设计与制造,2016(8):207-210, 215ZOU Shuai, ZHOU Jie, XU Jiahui et al. Study of Double Periodic Cylindrical Heat Transfer Mechanism under Tandem Transition Flow[J]. Machinery Design&Manufacture, 2016(8):207-210, 215
[3] ZHAO Zhou, ZHOU Shaodong, YUAN Yinnan. Study on Flow and Heat Transfer Characteristics of Tubes in Transition Flow-Flow Field of Tandem Cylinders[J]. Journal of Engineering Thermophysics, 2012, 33(12):2194-2196
[4]王云飞,陈浮.李国占,刘华坪.大山宏治.不同间距下并列柱绕流的大涡模拟[J].工程热物理学报,2013, 34(11):2039-2042WANG Yunfei, CHEN Fu, LI Guozhan et al. Large Eddy Simulation of Flow Around Side-by-Side Circular Cylinders at Various Spacing[J]. Journal of Engineering Thermophysics, 2013, 34(11):2039-2042
[5] Fujii M, Fujii T, Nagata T. A Numerical Analysis of Laminar Flow and Heat Transfer of Air in an in-line Tube Bank[J].Numerical Heat Transfer, 1984, 7(1):89-102
[6]张孝棣,蒋甲利,贾元胜,等.圆柱体绕流尾迹的PIV测量[J].实验流体力学,2005, 19(2):74-78ZHANG Xiaodi, JIANG Jiali, JIA Yuansheng et al. Measurements of Cylinder's Wake by PIV[J]. Journal of Experiments in Fluid Mechanics, 2005, 19(2):74-78
[7]涂程旭,王昊利,林建忠柱绕流的流场特性及涡脱落规律研究[J].中国计量学院学报,2008(2):98-102. 136TU Chengxu, WANG Haoli, LIN Jianzhong. Experimental Research on the Flow Characteristics and Vortex Shedding in the Flow Around a Circular Cylinder[J]. Journal of China Jiliang University, 2008(2):98-102, 136
[8]张园园,喜冠南.过渡流状态下5列叉排圆柱列流动传热特性研究[J].中国科技论文,2016, 11(11):1291-1294. 1320ZHANG Yuanyuan, XI Guannan. Study on Flow and Heat Transfer Characteristics of Five Offset Cylinder Arrays in Transitional Flow[J]. China Sciencepaper, 2016,11(11):1291-1294. 1320
[9] YAN Shifeng, Cai Chunsen, ZHOU Shaodong et al. Study on Fow and Heat Transfer Characteristics of Offset Cylinder Arrays in Transition Flow[J]. Journal of Engineering Thermophysics, 2013, 34(10):1948-1951
[10] Lam K, Lin Y F, Zou L et al. Experimental Study and Large Eddy Simulation of Turbulent Flow around Tube Bundles Composed of Wavy and Circular Cylinders[J].Heat and Fluid Flow, 2010, 31:32-44
[11]欧阳新萍.叉排与顺排套片式换热器的热力性能对比研究[C]//上海市制冷学会二○○三年学术年会论文集,上海市制冷学会,2003OUYANG Xinping. Contrast Study of Heat Transfer and Resistance Performance of Plate Fin Heat Exchangers with Cross Flow&Direct Flow[C]//Proceedings of the Annual Academic Year of Shanghai Institute of Refrigeration, Shanghai:Shanghai Institute of Refrigeration, 2003
[12] Ostanek J K, Thole K A. Wake Development in Staggered Short Cylinder Arrays within a Channel[J]. Experiments in Fluids, 2012, 53(3):673-697
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