本文選題：空氣動力學　切入點：有限長方柱體　出處：《哈爾濱工業(yè)大學學報》2017年12期 　論文類型：期刊論文

【摘要】：為減少高層建筑受到的風荷載,提高高層建筑抗風性能,提出一種頂部吸氣的主動控制方法。在一高寬比為H/d=5的正方形截面柱體的高層建筑模型上,通過在其頂部前邊緣開設狹縫進行吸氣來實現(xiàn)流動控制。通過風洞試驗研究了頂部吸氣對氣動力與頂部分離流的影響.利用流動可視化與流場測試結果揭示了頂部狹縫吸氣的控制機理.實驗對比了不同吸氣系數(shù)Q(=U/U_∞,U為狹縫吸氣速度)對氣動力控制效果的影響,并對Q=0,1和3的三種工況下風壓分布與頂部剪切流進行了詳細對比.研究發(fā)現(xiàn)狹縫吸氣改變了頂部分離流特性,并對模型所有高度上的氣動力均有顯著影響.Q=1時控制效果最佳,脈動阻力與脈動升力分別減小17.8%和45.5%.此時頂面分離流被削弱并伴隨有再附現(xiàn)象且湍流強度較大,最有利于頂部剪切流與尾流間的動量交換,從而削弱柱體展向渦脫落與脈動氣動力.
[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，

本文編號：1627043