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《Mechanics in Engineering》 2006-02
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EXPERIMENTAL STUDY ON TURBULENT DRAG REDUCTION AND SELF-EXCITED VIBRATION OF FLEXIBLE TUBES

CAI Shupeng TANG Chuanlin LI Damei (Zhuzhou Institute of Technology, Zhuzhou 412008, China) (School of Water Resource Hydropower, Wuhan University, Wuhan 430072, China)  
To clarify the relation between turbulent drag reduction and self-excited vibration of flexible tubes, experiments were performed on the effects of turbulent drag reduction and the characters of self-excited vibration, by comparing the turbulent drag with, that in a rigid tube and by using a double-sleeve structure and a laser displacement sensor. The results are as the follows: the thinner the flexible tubes, the larger the root mean square of the fluctuating displacement at the outer wall of the tubes, and the larger the decreasing rate of the friction coefficient of the self-excited vibration, while applying a pressure-balanced air on the outer wall, with the rates of drag reduction of the flexible tubes with thickness of 2mm, 3mm, 4mm, being about 12%, 10%, 9% at the Reynolds number of 17500. This would provide a reference for efficient fluid transportation.
【Fund】: 国家自然科学基金项目(50374087)资助
【CateGory Index】: O323
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【References】
Chinese Journal Full-text Database 1 Hits
1 CAI Shu-peng1,TANG Chuan-lin1,ZHANG Feng-hua1,YANG Lin2 (1.Inst.of High Pressure Water Jet,Hunan Univ.of Technol.,Zhuzhou 412008,China;2.School of Mechtronic and Automoblie Eng.,Chongqing Jiaotong Univ.,Chongqing 400074,China);Dynamic Characteristics on Friction Drag Reduction for Fluid Transport Using Flexible Tubes[J];Journal of Sichuan University(Engineering Science Edition);2009-02
【Co-references】
Chinese Journal Full-text Database 2 Hits
1 CAI Shupeng~(1,2) TANG Chuanlin~1 ZHANG Fenghua~1 1.Key Laboratory of High Pressure Water Jet and Turbulence Technology,Hunan University of Technology,Zhuzhou 412008; 2.School of Water Resource Hydropower,Wuhan University,Wuhan 430072;BEHAVIOR ON DRAG REDUCING BY COUPLING FLEXIBLE TUBES WITH TURBULENT FLOW[J];Chinese Journal of Mechanical Engineering;2007-10
2 ZHAO Han zhong (Department of Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China);Influence of compliant wall on velocity profile deformation in a turbulent boundary layer[J];Journal of Hydrodynamics;2002-04
【Secondary References】
Chinese Journal Full-text Database 1 Hits
1 CAI Shu-peng (Water Jet Flow Research Institute,Hu'nan Polytechnical University,Zhuzhou,Hu'nan 412008,China);Applying Future and Effects Estimation about Turbulent Flow Drag Reduction When Transporting Water with Flexible Tubes[J];Journal of Water Resources and Architectural Engineering;2009-03
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