雷诺数和半径比对90&#176;圆弧弯管流动特性的数值研究

李静; 杨俊红; 黄涛; 韩奎; 高琳

doi:10.13433/j.cnki.1003-8728.2017.1003

雷诺数和半径比对90°圆弧弯管流动特性的数值研究

doi: 10.13433/j.cnki.1003-8728.2017.1003

李静¹,
杨俊红^1, ,,
黄涛²,
韩奎²,
高琳¹

1.
天津大学中低温热能高效利用教育部重点实验室, 天津 300072;
2.
西安市长安区新区热力有限公司, 西安 710100

详细信息

作者简介:
李静(1991-),硕士研究生,研究方向为供热系统节能潜力分析及设计优化,1397219392@qq.com

通讯作者:
杨俊红(联系人),副教授,博士,yangjunhong@tju.edu.cn

计量
- 文章访问数: 226
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- PDF下载量: 10
- 被引次数: 0
出版历程
- 收稿日期: 2016-08-15
- 刊出日期: 2017-10-05

Numerically Studying Effects of Reynolds Number and Radius Ratio on Flow Characteristics of 90° Arc Bend Pipe

Li Jing¹,
Yang Junhong^{1
, ,},
Huang Tao²,
Han Kui²,
Gao Lin¹

1.
Ministry of Education Key Laboratory of Efficient Utilization of Low and Medium Grade Energy at School of Mechanical Engineering, Tianjin University, Tianjin 300072, China;
2.
Xi'an Changan District New City Heating Power Co. LTD, Xi'an 710100, China

摘要

摘要: 运用FLUENT软件中的RNG k-ε模型对不同雷诺数Re和不同半径比Rc/D下90°圆弧弯管内的流体流动进行了数值模拟，分析了管内流体的速度场分布、压力场分布以及二次流现象，考察了不同雷诺数Re（1×104≤Re≤1×106）和不同半径比Rc/D（0.6≤Rc/D≤2）组合下72种工况的局部阻力系数以及局部阻力影响长度。结果表明：同一Re下，Rc/D越大，局部阻力系数ξ越小。Rc/D一定时，当Re≤6×105时，局部阻力系数ξ随Re的增大迅速减小；当Re≧6×105时，局部阻力系数ξ随Re的变化很小，几乎趋于不变值。同一Re下，Rc/D越大，局部阻力影响长度越短。局部阻力影响长度随Re的增大先减小后趋于定值，且Rc/D越小，局部阻力影响长度越延后趋于定值。
- 90°弯管 /
- 雷诺数 /
- 半径比 /
- 局部阻力系数 /
- 影响长度 /
- 数值模拟
Abstract: The flow under different Reynolds number Re and different radius ratio Rc/D in 90° arc bend pipe was simulated with the numerical RNG k-ε turbulence model in the software FLUENT. The velocity distribution, pressure distribution and the secondary vortex flow inside the bend pipe were analyzed. The local drag coefficient, the effects of the length of local drag on 72 working conditions with different Reynolds numbers Re (1×104 ≤ Re ≤ 1×106) and different radius ratios Rc/D (0.6 ≤ Rc/D ≤ 2) were analyzed. It is found that Re is constant, the local drag coefficient is reduced when Rc/D increases. Rc/D is constant; Re ≤ 6×105; the local drag coefficient decreases quickly when Re increases; Re≧6×105; the local drag coefficient change with that of Re is very small. Re is constant; the greater Rc/D, the shorter the length of local drag influence. The effect of the length of local drag influence on the increase of Re is reduced and then reaches a constant value; the less Rc/D, the more delay, the longer it takes for the local drag coefficient to reach a constant value.
- turbulence model /
- pressure distribution /
- vortex flow /
- reynolds number /
- local drag coefficient /
- numerical method

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参考文献(19)

[1]	Sudo K, Sumida M, Hibara H. Experimental investigation on turbulent flow in a circular-sectioned 90-degree bend[J]. Experiments in Fluids, 1998,25(1):42-49
[2]	Taylor A M K P, Whitelaw J H, Yianneskis M. Curved ducts with strong secondary motion:velocity measurements of developing laminar and turbulent flow[J]. Journal of Fluids Engineering, 1982,104(3):350-359
[3]	马材芬,史峰,徐忠.90°弯道内紊流的试验研究[J]. 工程热物理学报,1990,11(1):37-40 Ma C F, Shi F, Xu Z. Developing turbulent flow in a 90°curved duct[J]. Journal of Engineering Thermal Physics, 1990,11(1):37-40(in Chinese)
[4]	许承,郭荣伟.三维弯管内分离流场的试验研究[J]. 航空学报,1994,15(9):1095-1099 Xu C, Guo R W. Experimental investigation for separated flow in three-dimensional bend duct[J]. Acta Aeronautica et Astronautica Sinica, 1994,15(9):1095-1099(in Chinese)
[5]	樊洪明,张达明,赵耀华,等.90°弯曲圆管内流动数值模拟[J].北京工业大学学报,2007,33(2):174-177 Fan H M, Zhang D M, Zhao Y H, et al. Numerical simulation on turbulent flow in a circular-section 90-degree bend[J]. Journal of Beijing University of Technology, 2007,33(2):174-177(in Chinese)
[6]	樊洪明,何钟怡,王小华.弯曲管段内流动的大涡模拟[J].水动力学研究与进展,2001,16(1):78-83 Fan H M, He Z Y, Wang X H. Large eddy simulation of a curved duct flow[J]. Journal of Hydrodynamics, 2001,16(1):78-83(in Chinese)
[7]	江山,张京伟,吴崇健,等.基于FLUENT的90°圆形弯管内部流场分析[J].中国舰船研究,2008,3(1):37-41 Jiang S, Zhang J W, Wu C J, et al. Numerical simulation of inner flow in 90° bending duct of circular-section based on fluent[J]. Chinese Journal of Ship Research, 2008, 3(1):37-41(in Chinese)
[8]	桂绍波,曹树良.基于SMAC方法的90°弯管内部流场数值模拟[J].江苏大学学报(自然科学版),2008,29(6):507-511 Gui S B, Cao S L. Numerical simulation of interior flow field in 90° curved duct based on SMAC method[J]. Journal of Jiangsu University (Natural Science Edition), 2008,29(6):507-511(in Chinese)
[9]	丁珏,翁培奋.90°弯管内流动的理论模型及流动特性的数值研究[J].计算力学学报,2004,21(3):314-321,329 Ding J, Weng P F. Numerical simulation of theoretical models & flow characteristics in 90° bending duct[J]. Chinese Journal of Computational Mechanics, 2004, 21(3):314-321,329(in Chinese)
[10]	史峰,徐忠,马材芬.大曲率弯道内湍流数值计算与测量[J].空气动力学学报,1990,8(4):423-429 Shi F, Xu Z, Ma C F. Turbulent flow in curved duct with large curvature numerical computation and measurement[J]. Acta Aerodynamica Sinica, 1990, 8(4):423-429(in Chinese)
[11]	贺益英,赵懿珺,孙淑卿,等.弯管局部阻力系数的试验研究[J].水利学报,2003,(11):54-58 He Y Y, Zhao Y J, Sun S Q, et al. Experimental study on local loss coefficient of bend in pipeline[J]. Journal of Hydraulic Engineering, 2003,(11):54-58(in Chinese)
[12]	尚虹,王尚锦,席光,等.90°圆截面弯管内三维紊流场实验研究[J].航空动力学报,1994,9(3):263-266,332 Shang H, Wang S J, Xi G, et al. Experimental study of 3-D turbulent flow field in a 90° bend pipe[J]. Journal of Aerospace Power, 1994,9(3):263-266,332(in Chinese)
[13]	湛含辉,朱辉,陈津端,等.90°弯管内二次流(迪恩涡)的数值模拟[J].锅炉技术,2010,41(4):1-5 Zhan H H, Zhu H, Chen J D, et al. Numerical simulation of secondary flow (dean vortices) in 90° curved tube[J]. Boiler Technology, 2010,41(4):1-5(in Chinese)
[14]	孙业志,胡寿根,赵军,等.不同雷诺数下90°弯管内流动特性的数值研究[J].上海理工大学学报,2010,32(6):525-529 Sun Y Z, Hu S G, Zhao J, et al. Numerical study on flow characteristics of 90° bend pipe under different reynolds number[J]. Journal of University of Shanghai for Science and Technology, 2010,32(6):525-529(in Chinese)
[15]	张昕,纪昌知,姜敏,等.相对粗糙度和雷诺数对90°弯管局部阻力系数的影响[J].水力发电学报,2013,32(4):88-93,152 Zhang X, Ji C Z, Jiang M, et al. Influence of relative roughness and Reynolds number on local resistance coefficient of 90°-bend pipeline[J]. Journal of Hydroelectric Engineering, 2013,32(4):88-93,152(in Chinese)
[16]	Miller D S. Internal flow system[Z]. Cranfield-Bedford:BHRA, 1971.
[17]	Ji C Z, Zhang X, Jiang M, et al. Numerical simulation of influence of 90°-bend pipeline geometric shape on local loss coefficient[C]//Proceedings of the 2nd International Conference on Mechanical and Electrical Technology. Singapore:IEEE, 2010:668-672
[18]	夏星星,冯良.管道绝对当量粗糙度的取值及其影响分析[J].上海煤气,2010,(2):10-12,17 Xia X X, Feng L. Analysis of the influence of absolute equivalent roughness[J]. Shanghai Gas, 2010,(2):10-12,17(in Chinese)
[19]	丁珏,翁培奋.三种湍流模式数值模拟直角弯管内三维分离流动的比较[J].计算物理,2003,20(5):386-390 Ding J, Weng P F. Numerical study on three dimensional turbulent separated flow in right-angled curved duct by three turbulent models[J]. Chinese Journal of Computational Physics, 2003,20(5):386-390(in Chinese)