Experimental study on Reynolds number effect of aerodynamic characteristics of rounded rectangular prism with width-thickness ratio of 2∶1
LIU Xiaobing1,2,3, TIAN Xuedong3, JIANG Huimin3, YANG Qun1,2,3
1.State Key Lab of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang 050043, China;
2.Innovation Center for Wind Engineering and Wind Energy Technology of Hebei Province, Shijiazhuang 050043, China;
3.School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China
Abstract:Rectangular prisms are widely used in practical engineering. Rounding corner treatments can effectively reduce the wind load and improve wind-induced vibration performance. However, the aerodynamic characteristics of rectangular prisms with round corners experience an obvious Reynolds number effect. In order to study the Reynolds number effect of aerodynamic characteristics of 2:1 rectangular prism with round corners and reduce the error caused by Reynolds number in the analysis of wind load and wind-induced vibration of such prism structure, pressure-measured wind tunnel tests were carried out on five rigid models with different rounded corner ratios (0.1, 0.2, 0.3, 0.4 and 0.5). The Reynolds number ranges from 0.8×105 to 3.6×105. The mean drag coefficients, mean wind pressure coefficients, and Strouhal number of rectangular prisms with different rounded corner ratios were obtained and analyzed by wind tunnel test, and compared with the standard rectangular prism. The results show that different from the standard rectangular prism, the aerodynamic characteristics of the five rectangular prisms with round corners show a certain Reynolds number effect, which increases first and then decreases with the increase of the rounded corner ratio. The Reynolds number effect is the strongest when the rounded corner ratio is 0.2, and the obvious jump occurs when the Reynolds number is 2.8×105. The mean drag coefficients of different rectangular prisms with round corners decrease with the increase of the Reynolds number. Compared with other positions, the mean wind pressure coefficients at the side face and corner positions of the rectangular prisms with round corners are more obviously affected by Reynolds number, and the corner positions are the most obvious. The Strouhal number of the rectangle prisms with round corners is basically stable around 0.22 when the rounded corner ratio is 0.1, and around 0.24 and 0.31 before and after the jump when the rounded corner ratio is 0.2. At other rounded corner ratios, it increases first and then stabilizes with the increase of Reynolds number.
刘小兵1,2,3,田学东3,姜会民3,杨群1,2,3. 宽厚比为2:1的圆角矩形断面气动特性的雷诺数效应试验研究[J]. 振动与冲击, 2023, 42(7): 1-7.
LIU Xiaobing1,2,3, TIAN Xuedong3, JIANG Huimin3, YANG Qun1,2,3. Experimental study on Reynolds number effect of aerodynamic characteristics of rounded rectangular prism with width-thickness ratio of 2∶1. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(7): 1-7.
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