顶部定常吸气对高层建筑模型气动力的影响

发布时间：2018-03-17 23:39

  本文选题：空气动力学　切入点：有限长方柱体　出处：《哈尔滨工业大学学报》2017年12期 　论文类型：期刊论文

【摘要】：为减少高层建筑受到的风荷载,提高高层建筑抗风性能,提出一种顶部吸气的主动控制方法。在一高宽比为H/d=5的正方形截面柱体的高层建筑模型上,通过在其顶部前边缘开设狭缝进行吸气来实现流动控制。通过风洞试验研究了顶部吸气对气动力与顶部分离流的影响.利用流动可视化与流场测试结果揭示了顶部狭缝吸气的控制机理.实验对比了不同吸气系数Q(=U/U_∞,U为狭缝吸气速度)对气动力控制效果的影响,并对Q=0,1和3的三种工况下风压分布与顶部剪切流进行了详细对比.研究发现狭缝吸气改变了顶部分离流特性,并对模型所有高度上的气动力均有显著影响.Q=1时控制效果最佳,脉动阻力与脉动升力分别减小17.8%和45.5%.此时顶面分离流被削弱并伴随有再附现象且湍流强度较大,最有利于顶部剪切流与尾流间的动量交换,从而削弱柱体展向涡脱落与脉动气动力.
[Abstract]:In order to reduce the wind load on high-rise buildings and improve the anti-wind performance of high-rise buildings, an active control method of inspiratory at the top is proposed. In a high-rise building model with a square section column with a aspect ratio of H / D ~ (5), The flow control is realized by opening a slit at the front edge of the top to realize the flow control. The effect of the top suction on the aerodynamic force and the top separation flow is studied by wind tunnel test. The flow visualization and flow field test results reveal the top of the air flow. The control mechanism of partial slit suction. The effect of different inspiratory coefficients Q / U / U 鈭，

本文编号：1627043