Characteristics of Fluctuating Lift Forces of a Circular Cylinder During Generation of Vortex Excitation (In Case of Cross-Flow Vibration)

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  • SAKAMOTO Hiroshi
    Department of Mechanical Engineering, Kitami Institute of Technology
  • KIM Sangil
    Department of Mechanical Engineering, Kitami Institute of Technology
  • TAKAI Kazunori
    Department of Mechanical Engineering, Kitami Institute of Technology
  • OBATA Yoshihoro
    Department of Mechanical Engineering, Kitami Institute of Technology

Bibliographic Information

Other Title
  • 円柱の渦励振発現時における変動揚力特性（クロスフロー振動の場合）
  • エンチュウ ノ ウズ レイシン ハツゲンジ ニ オケル ヘンドウ ヨウリョク トクセイ クロスフロー シンドウ ノ バアイ
  • In Case of Cross-Flow Vibration
  • クロスフロー振動の場合

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Description

This paper describes the characteristics of the fluctuating lift forces when a circular cylinder vibrates in the cross-flow direction. The response characteristics on elastically supported the circular cylinder was first examined by a free-vibration test. Next, flow-induced vibrations obtained by the free-vibration test were reproduced by a forced-vibration test, and then the characteristics of the fluctuating lift forces, the work done by the fluctuating lift, the behavior of the rolling-up of the separated shear layers were investigated on the basis of the basis of the visualized flow patterns. The main findings were that (i) the fluctuating lift forces become considerably large than those of a stationary circular cylinder, (ii) negative pressure generates on the surface of the circular cylinder when the rolling-up of separated shear layer begins, (iii) the phase between the fluctuating lift force and the cylinder displacement changes abruptly as the reduced velocity Ur increases, and (iv) whether the generating cross-flow vibration becomes divergent or convergent can be described based on the work done by the fluctuating lift forces, Furthermore, it was found that the generation of cross-flow vibration can be perfectly suppressed when the small tripping rods are installed on the surface of the circular cylinder.

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