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采用1:3大比例模型,通过风洞试验研究了美国德州理工大学(Texas Tech University,TTU)建筑模型表面平均、脉动、峰值风压系数的分布规律,并与实测数据和小比例模型试验数据进行了对比,分析了影响试验结果的部分因素。结果表明:TTU建筑模型典型位置的风压系数试验数据与实测值在整体规律性变化上一致,但试验低估了屋檐、屋角在风向角165°~240°范围内的脉动、峰值风压系数;越靠近屋角流动分离区域测点的风压系数绝对值也越大,最靠近建筑屋面角点的测点峰值风压系数达-16.7;大比例模型屋角、屋檐等区域试验结果更接近于实测值,排除了测点测压管直径不匹配的影响后,考虑到试验中湍流度模拟与实际的差异,大比例模型模拟效果更优;试验样本长度影响峰值风压系数的计算,在屋角区域,长样本峰值风压系数值均相对较大;而离屋角较远时,长样本的峰值风压系数则可能相对较小。
The 1: 3 large-scale model was used to study the distribution law of surface average, pulsation and peak wind pressure coefficient of the building model of Texas Tech University (TTU) by wind tunnel test. The results were compared with the measured data and the small scale model test data In contrast, some factors that affect the test results were analyzed. The results show that the wind pressure coefficient test data at the typical location of TTU building model are consistent with the measured values in the overall regularity change. However, the test underestimated the pulsation and peak wind pressure coefficient of roof eaves and roof angle within 165 ° ~ 240 ° of wind direction angle ; The wind pressure coefficient closer to the measuring point in the flow separation area is larger, the wind pressure coefficient at the measuring point closest to the building roof corner is -16.7; the test results of the roof, roof and eave of the large-scale model are closer After the measured value, excluding the effect of the diameter mismatch of the piezometer at the measuring point, the simulation of the large-scale model is more effective when considering the difference between the turbulence simulation and the actual test. The calculation of the peak wind pressure coefficient influenced by the length of the test sample, In the corner area, the value of the peak wind pressure coefficient of the long sample is relatively large. However, the peak wind pressure coefficient of the long sample may be relatively small when the angle is far away from the house.