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在低紊流度的均匀流场中分别对截面宽厚比B/D(B为模型的顺风向宽度,D为迎风面厚度)为2、2.5、3、3.5和4的二维矩形柱体模型进行了测压试验,雷诺数(Re)的变化范围为1.1×105~6.8×10~5。分析了各模型表面的三个典型测点的脉动风压系数的功率谱特性,研究了各模型侧面的风压相关性。研究结果表明气流再附于模型侧面会影响模型侧面和背风面典型测点的风压系数功率谱,且B/D=4模型的三个典型测点的风压系数功率谱随雷诺数变化明显。B/D=2模型侧面的风压相关性较好,但B/D=2.5、3和3.5模型的侧面靠近前边缘的测点与气流再附区的测点的风压相关性较强,侧面中部区域的测点与侧面前后部区域的测点的风压相关性较差。B/D=4模型侧面的风压相关性受雷诺数影响明显,在雷诺数Re=6.8×10~5时出现了明显的突变。
In a uniform flow field with low turbulence, a two-dimensional rectangular cylinder model with aspect ratio B / D (B is the downwind width of the model and D is the windward surface thickness) is 2, 2.5, 3, 3.5 and 4 respectively The pressure test was carried out. The Reynolds number (Re) ranged from 1.1 × 105 to 6.8 × 10 ~ 5. The power spectrum characteristics of pulsating wind pressure coefficient of three typical measuring points on each model surface were analyzed. The wind pressure correlations on the sides of each model were studied. The results show that the wind power re-attached to the side of the model will affect the wind pressure coefficient power spectrum at the typical measuring points on the model side and the leeward side, and the wind power coefficient of the three typical measuring points of the B / D = 4 model changes significantly with the Reynolds number . The wind pressure on the side of B / D = 2 model has a good correlation, but the wind pressure on the side of B / D = 2.5, 3 and 3.5 models near the front edge is more dependent on the wind pressure at the measuring point of the reattachment zone. The wind pressure at the measuring point in the side central area is inferior to the measuring point in the fore and aft areas in the side surface. The wind pressure dependence on the side of B / D = 4 model is significantly affected by the Reynolds number, and significant changes occur at a Reynolds number of Re = 6.8 × 10 ~ 5.