Wind and Structures

  • 제15권6호
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  • Pages.463-480
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  • 2012
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  • 1226-6116(pISSN)
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  • 1598-6225(eISSN)
테크노프레스 (Techno-Press)
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The subtle effect of integral scale on the drag of a circular cylinder in turbulent cross flow

  • Younis, Nibras (Mechanical, Automotive & Materials Engineering University of Windsor Windsor) ;
  • Ting, David S.K. (Mechanical, Automotive & Materials Engineering University of Windsor Windsor)
  • 투고 : 2011.04.07
  • 심사 : 2012.04.19
  • 발행 : 2012.11.25
⟨ 이전 논문 다음 논문 ⟩

초록

The effects of Reynolds number (Re), freestream turbulence intensity (Tu) and integral length scale (${\Lambda}$) on the drag coefficient ($C_d$) of a circular cylinder in cross flow were experimentally studied for $6.45{\times}10^3$ < Re < $1.82{\times}10^4$. With the help of orificed plates, Tu was fixed at approximately 0.5%, 5%, 7% and 9% and the normalized integral length scale (L/D) was varied from 0.35 to 1.05. Our turbulent results confirmed the general trend of decreasing $C_d$ with increasing Tu. The effectiveness of Tu in reducing $C_d$ is found to lessen with increasing ${\Lambda}$/D. Most interestingly, freestream turbulence of low Tu (${\approx}5%$) and large ${\Lambda}$/D (${\approx}1.05$) can increase the $C_d$ above the corresponding smooth flow value.

키워드

참고문헌

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