Experimental research on the aerodynamic characteristics in the critical Reynolds number regime of stay-cables with micro elliptical section
XIAO Bin1, LIU Qingkuan2,3, WANG Xiaojiang1, JA Yaya2,3
1.School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China; 2.Wind Engineering Research Center, Shijiazhuang Tiedao University, Shijiazhuang 050043, China; 3.Innovation Center for Wind Engineering and Wind Energy Technology of Hebei Province, Shijiazhuang 050043, China
Abstract：In order to study the aerodynamic characteristics of stay-cables with micro elliptical section, a circular section cable and a micro elliptical section cable models were taken as research objects.Different section deformation and wind attack angle were considered in the wind tunnel tests, and the variation of aerodynamic force coefficients with Reynolds numbers under different conditions were analyzed.At the same time, the change of vortex shedding in wake flow around the circular section and the micro elliptical section models at the subcritical, critical and supercritical Reynolds number regimes were obtained by the lift time history and lift spectrum analysis.The results show that the lift coefficient in the subcritical regime of the micro elliptical model is basically unchanged, after entering the critical regime, the lift coefficient increases with the increase of Reynolds number.When the wind attack angle is within the range from 0° to 50°, the Reynolds number corresponding to the maximum lift coefficient increases with the increase of wind attack angle.The lift coefficients time history of the models may display bistable phenomenon during the transition from TrBL0 to TrBL1 and from TrBL1 to TrBL2.The deformation will affect the vortex shedding in the wake area of the cables, and further influence the value of the Strouhal number at different Reynolds numbers.
肖彬1，刘庆宽2,3，王晓江1，贾娅娅2,3. 微椭圆形截面斜拉索临界雷诺数区气动特性试验研究[J]. 振动与冲击, 2020, 39(9): 103-111.
XIAO Bin1, LIU Qingkuan2,3, WANG Xiaojiang1, JA Yaya2,3. Experimental research on the aerodynamic characteristics in the critical Reynolds number regime of stay-cables with micro elliptical section. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(9): 103-111.
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