http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
The subtle effect of integral scale on the drag of a circular cylinder in turbulent cross flow
Younis, Nibras,Ting, David S.K. Techno-Press 2012 Wind and Structures, An International Journal (WAS Vol.15 No.6
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.
The subtle effect of integral scale on the drag of a circular cylinder in turbulent cross flow
Nibras Younis,David S.K. Ting 한국풍공학회 2012 Wind and Structures, An International Journal (WAS Vol.15 No.6
The effects of Reynolds number (Re), freestream turbulence intensity (Tu) and integral length scale (Λ) on the drag coefficient (Cd) of a circular cylinder in cross flow were experimentally studied for 6.45 × 103 < Re < 1.82 × 104. 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 Cd with increasing Tu. The effectiveness of Tu in reducing Cd is found to lessen with increasing Λ/D. Most interestingly, freestream turbulence of low Tu ( ~5%) and large Λ/D (~1.05 ) can increase the Cd above the corresponding smooth flow value.