Abstract
The aerodynamic coefficients transiting test is a new method for measuring the structural aerodynamic coefficients using the wind generated by a moving vehicle. However, the effect and correction of natural wind on the transiting test has not been studied. Hence, in this study, the investigation of the aerodynamic force and pressure measurements on a special triangular prism model is simulated through the transiting test under different natural wind conditions for 30° and 90° angles of wind incidence. Force and pressure measurement results in the transiting test are used to describe and explain the effect of natural wind in the range of 0–3.0 m/s on the aerodynamic coefficients of the symmetric triangular prism qualitatively and quantitatively. The results show that the driving wind field of the vehicle, aerodynamic force coefficient, and aerodynamic pressure coefficient are significantly influenced by strong natural wind greater than 1.71 m/s, which must be considered and so it is recommended that the structure aerodynamic coefficients transiting test should be conducted under the condition that the natural wind is less than 1.71 m/s. In addition, the method of two-direction round-trip measurement is proposed to modify the effect of natural wind on transiting tests.
Highlights
The aerodynamic coefficients of structures are an important parameter in the study of structural wind engineering [1]
66. .CCoonInnclctulhusiissoisontnussdy, the qualitative and quantitative analysis of the effect of natural wind on the tIrnIannthstihitsiinssgtsuttudedsyty,w,thtahesecqaquruaraliieltdiatatoitvuivet.eaTanhndedqfoqulualoanwntititinatatgitvciveoenacanlnuaalsyliyosinssissocofafnthtbheeeedeffrfefaecwtctnooffrfnonamatutturharialslwswtiunidndyd. os(tosn1utn)udthdtyhey.nTe.tahrttaeruanwrnsaiistlniitdwningfiignetdeltdesstsoptwfewtaehasdescidacsrargirrvirreieinedagdtoevoureutth.hti.TcaTlhnehew1ef.o7iflol1llloblmowew/sinisign.gngTicfihoccoenancinlncutlfllusyuisoaieonfnfnsecscectaceoandfnbnobenaetldyudrrwaraawlhwwennnifnrtfhordoemimmnthetthhaisnies range of 0–3.0 m/s on the mean velocity error of the driving wind is less than 10%. (2) The effect of natural wind on the aerodynamic force coefficients is limited and negligible when the mean natural wind speed is smaller than 1.91 m/s
(3) When mean natural wind speed is smaller than 1.71 m/s, the weak natural wind has a limited impact on the mean aerodynamic pressure coefficients and the impact can be ignored
Summary
The aerodynamic coefficients of structures are an important parameter in the study of structural wind engineering [1]. The full-scale field measurement research [12,13], computational fluid dynamics that are based on fluid calculation software [14], and the wind tunnel test [15,16] are commonly used methods for investigating the structural aerodynamic coefficients. The transiting test can be affected by factors such as the Reynolds number, end plate, natural wind, road type, and vehicle interference. The transiting test method of the structural aerodynamic coefficients is an outdoor road test exposed to the wind environment. Test Methods and Strategies To investigate the influence of natural wind on the test results of the aerodynamic coefficients, the transiting test must control all the experimental conditions, except natural wind, which is to remain unchanged. C d and C l are the standard deviations of Cd and Cl and represent the fluctuating drag and lift coefficient, respectively
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