The effects of aerodynamic interference on the aerodynamic characteristics of a twin-box girder

Wu，Buchen1,2,3,4; Xue，Geng1,2; Feng，Jie1,2; Laima，Shujin1,2

2021-10-01

10.3390/app11209517

Applied Sciences (Switzerland)   影响因子和分区

2076-3417

To investigate the aerodynamic characteristics of a twin-box girder in turbulent incoming flow, we carried out wind tunnel tests, including two aerodynamic interferences: leading body-height grid, and leading circular cylinder. In this study, the pressure distribution and the mean and fluctuating aerodynamic forces with the two interferences are compared with bare deck in detail to investigate the relationship between aerodynamic characteristics and the incoming flow characteristics (including Reynolds number and turbulence intensity). The experimental results reveal that, owing to the body-height flow characteristics around the deck interfered with by the body-height grid, the disturbed aerodynamic characteristics of the twin-box girder differ considerably from those of the bare twin-box girder. At the upstream girder, due to the vortex emerging from the body-height grid breaking the separation bubble, pressure plateaus in the upper and lower surface are eliminated. In addition, the turbulence generated by the body-height grid reduces the Reynolds number sensitivity of the twin-box girder. At a relatively high Reynolds number, the fluctuating forces are mainly dominated by turbulence intensity, and the time-averaged forces show almost no change under high turbulence intensity. At a low Reynolds number, the time-averaged forces change significantly with the turbulence intensity. Moreover, at a low Reynolds number, the wake of the leading cylinder effectively forces the boundary layer to transition to turbulence, which reduces the Reynolds number sensitivity of the mean aerodynamic forces and breaks the separation bubbles. Additionally, the fluctuating drag force and the fluctuating lift force are insensitive to the diameter and the spacing ratio.

Aerodynamic forces Pressure distribution Turbulence intensity Twin-box girder

SCI

英语

其他

NSFC[51878230] ; Natural Science Foundation of Heilongjiang Province[YQ2021E033] ; Postdoctoral Scientific Research Development Fund of Heilongjiang Province[LBH-Q20021]

Chemistry ; Engineering ; Materials Science ; Physics

Chemistry, Multidisciplinary ; Engineering, Multidisciplinary ; Materials Science, Multidisciplinary ; Physics, Applied

WOS:000726420400001

MDPI

2-s2.0-85117948506

Scopus

1.Key Lab of Smart Prevention and Mitigation for Civil Engineering Disasters of the Ministry of Industry and Information,Harbin Institute of Technology,Harbin,150090,China
2.Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education,Harbin Institute of Technology,Harbin,150090,China
3.Department of Mechanical Engineering,National University of Singapore,Singapore,10 Kent Ridge Crescent,119260,Singapore
4.Guangdong Provincial Key Laboratory of Turbulence Research and Applications,Department of Mechanics and Aerospace Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Wu，Buchen,Xue，Geng,Feng，Jie,et al. The effects of aerodynamic interference on the aerodynamic characteristics of a twin-box girder[J]. Applied Sciences (Switzerland),2021,11(20).

Wu，Buchen,Xue，Geng,Feng，Jie,&Laima，Shujin.(2021).The effects of aerodynamic interference on the aerodynamic characteristics of a twin-box girder.Applied Sciences (Switzerland),11(20).

Wu，Buchen,et al."The effects of aerodynamic interference on the aerodynamic characteristics of a twin-box girder".Applied Sciences (Switzerland) 11.20(2021).