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凹坑形表面在空气介质中的减阻性能研究
引用本文:徐中,徐宇,王磊,徐文骥.凹坑形表面在空气介质中的减阻性能研究[J].摩擦学学报,2009,29(6):579-583.
作者姓名:徐中  徐宇  王磊  徐文骥
作者单位:大连理工大学机械工程学院,辽宁大连116024;大连理工大学机械工程学院,辽宁大连116024;大连理工大学机械工程学院,辽宁大连116024;大连理工大学机械工程学院,辽宁大连116024
基金项目:国家自然科学基金重大研究计划资助项目(90923022);大连市科技计划资助项目(2008A14GX242).
摘    要:采用标准k-ε湍流模型对一种新型的非光滑表面———凹坑形表面在空气介质中不同条件下的流动进行了数值模拟,可以得到光滑表面和半径0.4mm的半球状凹坑分布的非光滑表面在4~48m/s范围内的来流速度下的阻力系数.计算结果表明该凹坑形非光滑表面在这个速度区间内均能产生一定的减阻效果.在速度为24m/s时,它的减阻率达到最大的7.2%.最后本文对该非光滑表面的减阻机理进行了研究.

关 键 词:凹坑形沟槽  非光滑表面  减阻  数值模拟  边界层
收稿时间:4/8/2009 12:00:00 AM
修稿时间:8/9/2009 12:00:00 AM

Drag Reduction Effect of Dimple Concave Surface in Air
XU Zhong,XU Yu,WANG Lei and XU Wen-ji.Drag Reduction Effect of Dimple Concave Surface in Air[J].Tribology,2009,29(6):579-583.
Authors:XU Zhong  XU Yu  WANG Lei and XU Wen-ji
Institution:School of Mechanical Engineering, Dalian University of Technology.Dalian116024,China;School of Mechanical Engineering, Dalian University of Technology.Dalian116024,China;School of Mechanical Engineering, Dalian University of Technology.Dalian116024,China;School of Mechanical Engineering, Dalian University of Technology.Dalian116024,China
Abstract:The flow of a new unsmooth surface-dimple concave surface in air was simulated numerically and the drag reduction coefficients of both unsmooth surface and smooth surface with hemisphere of 0.4mm dius were presented. The result showed that this kind of unsmooth surface had a good drag reduction effect for flow velocity ranging from 4m/s to 48m/s. And it had the best reducing ability (7.2%)at a velocity of 24m/s. The theory of the drag reduction was finally analyzed.
Keywords:dimple concave  unsmooth surface  drag reduction  numerical simulation  boundary layer
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