论文部分内容阅读
为了研究在突变气流作用下结构的空气动力特性,介绍了利用主动控制风洞模拟突变气流的试验研究。首先通过该风洞模拟出了雷暴冲击风阵风剖面;然后,采用“阶跃流法”模拟了风速突变的时程;最后将高层结构模型置于该突变气流中,观测在特殊气流中结构表面风压以及结构空气动力学参数的变化特征。试验结果表明,利用主动控制风洞模拟出的雷暴冲击风阵风剖面同理论的相似性达到90%以上,突变气流会使高层结构整体产生较大的非定常升力,并且在结构表面产生较大的非定常风压。
In order to study the aerodynamic characteristics of the structure under the action of abrupt airflow, an experimental study on the simulation of abrupt airflow using an active wind tunnel is presented. First, the thunderstorm impact wind gust profile was simulated through the wind tunnel; then, the time history of the wind speed abrupt change was simulated by the “step flow method”; finally, the high-rise structural model was placed in the abrupt gas flow and observed in the special gas flow Structural Surface Wind Pressure and Structural Aerodynamic Parameters. The experimental results show that the similarity of the same theory of thunderstorms and wind gusts simulated by active wind tunnels is more than 90%, and the abrupt airflow can cause large unsteady lift of high-rise structures as a whole and produce large Unsteady wind pressure.