کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7176080 | 1466597 | 2014 | 18 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Reynolds number effects on aerodynamic characteristics and vortex-induced vibration of a twin-box girder
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی مکانیک
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Reynolds number effects on aerodynamic characteristics and vortex-induced vibration of a twin-box girder Reynolds number effects on aerodynamic characteristics and vortex-induced vibration of a twin-box girder](/preview/png/7176080.png)
چکیده انگلیسی
An experimental investigation of Reynolds number effects on aerodynamic characteristics and vortex-induced vibration (VIV) of a twin-box girder was performed. The Reynolds number is in the range of 5.85Ã103â¤Reâ¤1.12Ã105 when using the central height of the twin-box girder as the characteristic length. The pressure distributions, aerodynamic force and vortex-shedding frequency at various Reynolds numbers were investigated. The results indicate that all the aerodynamic characteristics have obvious Reynolds number sensitivity. According to the mean and fluctuating pressure distributions, the leading separated bubble length on the lower surface was obtained. With increases in Reynolds number, the transition point from laminar flow to turbulence flow and the reattachment point of the separated shear layer gradually move upstream, and the bubble size shrinks. Simultaneously, the drag force coefficient decreases, whereas the Strouhal number increases. In addition, the bubble length has a good linear relationship with the drag force coefficient and with the Strouhal number. The Reynolds number effects on the VIV of a twin-box girder were investigated at three Reynolds number levels: Re=[6.47Ã103-7.93Ã103], [1.17Ã104-1.62Ã104] and [1.87Ã104-2.90Ã104]. The results indicate that the VIV of a twin-box girder has significant Reynolds number dependence. The peak amplitude of the VIV increases with increase in the Reynolds number. The relationship between the peak amplitude of the VIV of the twin-box girder and the Skop-Griffin number at various Reynolds numbers was obtained, which can be employed to predict the peak amplitude of VIV.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Fluids and Structures - Volume 50, October 2014, Pages 358-375
Journal: Journal of Fluids and Structures - Volume 50, October 2014, Pages 358-375
نویسندگان
Hui Li, Shujin Laima, Haiquan Jing,