化工进展 ›› 2017, Vol. 36 ›› Issue (11): 3971-3976.DOI: 10.16085/j.issn.1000-6613.2017-0436

• 化工过程与装备 • 上一篇    下一篇

方形管道内壁面微结构对湍流减阻效果的影响

李恩田1,2, 吉庆丰1, 庞明军3   

  1. 1. 扬州大学水利与能源动力工程学院, 江苏 扬州 225127;
    2. 常州大学石油工程学院, 江苏 常州 213016;
    3. 常州大学机械工程学院, 江苏 常州 213016
  • 收稿日期:2017-03-16 修回日期:2017-04-12 出版日期:2017-11-05 发布日期:2017-11-05
  • 通讯作者: 李恩田(1977-),男,副教授,博士研究生,主要从事湍流减阻方面的研究。
  • 作者简介:李恩田(1977-),男,副教授,博士研究生,主要从事湍流减阻方面的研究。E-mail:let@cczu.cn。
  • 基金资助:
    国家自然科学基金(51376026)及江苏省高校自然科学研究重大项目(15KJA470001)。

Influence of wall microstructure on turbulent drag reduction in square pipe

LI Entian1,2, JI Qingfeng1, PANG Mingjun3   

  1. 1. School of Hydraulic Energy and Power Engineering, Yangzhou University, Yangzhou 225127, Jiangsu, China;
    2. School of Petroleum Engineering, Changzhou University, Changzhou 213016, Jiangsu, China;
    3. School of Mechanical Engineering, Changzhou University, Changzhou 213164, Jiangsu, China
  • Received:2017-03-16 Revised:2017-04-12 Online:2017-11-05 Published:2017-11-05

摘要: 利用循环管路系统,对方形管道内壁面微结构对湍流减阻效果的影响进行了试验研究,研究了循环管路系统不同壁面微结构下流动的范宁系数和减阻率。试验采用的肋条结构尺寸为:肋条宽度均为1.0mm,肋高分别是h=0.3mm、0.5mm、0.7mm。试验介质为普通自来水,水温控制在25℃±0.5℃,水平管道内流体流速范围为0.03~1.80m/s。试验研究结果表明:在量纲为1的肋深h+处于4~15范围内,肋条壁面的范宁系数小于光滑壁面的范宁系数,肋条壁面具有减阻效果;肋高h=0.5mm肋条的减阻效果最好,最大减阻率为11.91%;粒子成像测速仪研究了不同壁面微结构下流体流动的平均速度、雷诺切应力和近壁区的涡量。实验结果表明:肋条的存在使得湍流边界层增厚,雷诺切应力减小,近壁区的涡量降低,从而达到减阻的效果。

关键词: 壁面微结构, 范宁系数, 减阻率, 雷诺应力, 涡量

Abstract: In the present work, the flow characteristics and drag reduction of a turbulent flow field over a riblets surface plate were investigated experimentally and compared with a smooth surface. Experimental tests were carried out in a closed rectangular duct with 1mm in width and 0.3mm,0.5mm,0.7mm in height riblets using particle image velocimetry. Tap water was used in this experiment and test temperature was controlled at 25℃±0.5℃,and the velocity was maintained between 0.03-1.8m/s. The study showed that a notable decrease in fanning friction factor for riblets surfaces can be seen at an h+ range of 4-15 compared with flat plate. A maximum rag-reduction of nearly 11.91 percent was acquired over the riblets surface of 1 mm wide and 0.5 mm height. Riblet can thicken the boundary layer and weaken turbulent fluctuation intensity. Furthermore,both Reynolds shear stress and vorticity and root-mean-square velocity were decreased.

Key words: wall microstructure, fanning friction factor, drag reduction rate, Reynolds shear stress, vorticity

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