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利用刚性模型测压试验的方法,在低湍流度的均匀流场中测量了4种圆角处理(即圆角半径与模型迎风面厚度之比(圆角率)分别为0、5%、10%和15%)的截面宽厚比(截面顺风向宽度与迎风面厚度之比)分别为2、3和4的二维矩形柱体模型的表面风压,试验雷诺数为3.4×105。研究了圆角处理对3种截面宽厚比模型表面的3个典型测点的风压系数功率谱密度的影响,并分析了每种截面宽厚比模型的侧面风压分布及其风压相关性随圆角率的变化规律。研究表明:当圆角率为0和5%时,截面宽厚比为2的模型侧面不会出现气流再附现象,而当圆角率为10%和15%时,气流会再附于截面宽厚比为2的模型的侧面;圆角处理主要影响截面宽厚比为3和4的模型侧面的气流再附区的风压分布,而侧面气流分离区的负压绝对值基本不变;3种截面宽厚比的模型中,圆角处理对截面宽厚比为2的模型的侧面风压相关性影响最大。
Using the rigid model pressure test method, four kinds of fillet treatment (ie, the fillet radius and the model windward thickness ratio (fillet rate) were 0, 5%, 10 respectively in uniform flow field with low turbulence) % And 15%, respectively), the surface wind pressure of two-dimensional rectangular cylinder model with 2, 3 and 4 respectively, the experimental Reynolds number is 3.4 × 105. The effect of fillet treatment on the power spectral density of the wind pressure coefficient at three typical measuring points on the three kinds of section width to thickness ratio models was studied. The lateral wind pressure distribution and its wind pressure dependence Rounded rate of change. The results show that when the fillet rate is 0 and 5%, the phenomenon of air re-attachment does not appear on the side of the model with aspect ratio 2, while when the fillet rate is 10% and 15% Ratio of 2; the fillet treatment mainly affected the wind pressure distribution of the airflow reattachment zone on the model side with aspect ratios 3 and 4, but the absolute value of the negative pressure in the side airflow separation zone remained basically unchanged; In the model with aspect ratio, the cornering effect has the greatest effect on the side wind pressure dependence of the model with aspect ratio 2.