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使用可调导流板、挡板和粗糙元,在大气边界层风洞内实现了对1∶300和1∶600两种流场比例下击暴流风场的模拟,并与经典的理论剖面进行对比,对模型区域范围内风场的水平和竖向风速分布进行了较为详细的考察,在此基础上研究了一大跨度圆柱形屋盖在所模拟的下击暴流风场的风压系数分布特征,并与GB 50009—2001的B类地貌风场的结果进行比较。结果显示,所模拟的两种比例的下击暴流水平风剖面与理论值吻合较好,模拟出的下击暴流的竖向风剖面在一定高度范围内与水平风剖面有着相似的分布规律,且在模型区域具有较好的稳定性。圆柱形屋盖模型的试验结果表明,该屋盖在下击暴流风场测得的平均风压系数分布和B类地貌风场的结果非常接近,但极值风压系数小于B类地貌风场的试验结果。
Using the adjustable deflector, baffle and roughness element, the simulation of the storm surge wind field at a ratio of 1: 300 and 1: 600 in the atmospheric boundary layer wind tunnel was achieved and compared with the classical theoretical profile In contrast, the horizontal and vertical distributions of wind velocity in the wind field over a model area are investigated in detail. Based on this, the distribution of wind pressure coefficients of a long-span cylindrical roof in the simulated downburst wind field is studied Characteristics, and with GB 50009-2001 Class B landscape wind field results were compared. The results show that the simulated horizontal draft of the downburst level is in good agreement with the theoretical value. The vertical section of the simulated downburst has a similar distribution with horizontal wind profile over a certain height range , And has good stability in the model area. The test results of the cylindrical roof model show that the average wind pressure distribution measured by the roof in the downburst wind field is very close to that of the B-type wind field, but the extreme pressure coefficient is less than that of the B-type wind field test results.