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| 1 | 分段吸气高层建筑减阻性能的数值研究显示文摘为减小高层建筑的风致阻力,采用CFD方法研究了主动吸气控制下高层建筑模型的风载荷减阻性能,分析了竖向开孔位置、吸气孔高度和吸气速度等参数对减阻性能的影响,并详细展示流场,讨论吸气控制机理.结果表明:保持流量系数不变,增加吸气孔高度(或减小吸气速度)使得模型各表面的风压折减效率η_(PR),阻力折减效率η_(DR)和基底弯矩折减效率η_(MR)增大,且只有η_(MR)在较大吸气孔高度时超过1.0.拟合了η_(DR)和η_(MR)关于吸气孔中心高度、吸气孔高度和吸气速度的经验公式,为分段吸气控制的应用提供参考.基于最大风压折减效率和最小吸气功率,比较了各分段吸气模型和全高吸气模型的减阻性能,发现全高吸气模型的减阻性能优于分段吸气模型.可在高层建筑中上部设置吸气装置来减小基底弯矩或改善其局部风压特性. | 郑朝荣 张耀春 | 2011 | 力学学报2011，43，2： | 2 |
| 2 | Numerical investigation on the drag reduction properties of a suction controlled high-rise building显示文摘To reduce the wind-induced drag and improve the wind-resistance performance of a high-rise building, steady suction control is introduced into the building structure. Based on validation of the numerical methods by experiment with suction control over the flow separation of a 3D backward-facing step, the Reynolds stress equation model is used to investigate the drag reduction (DR) properties of a high-rise building whose side faces are controlled by all-height suction. Effects of the orifice geometrical parameters and suction flux parameters on the DR and the separation control are analyzed, and the detailed flow fields are shown to clarify the mechanism of suction control. The results indicate that suction control is very effective in reducing the wind loads on the high-rise building model, and only the dimensionless suction flux dominates. Lastly, the power consumed and the counterforce induced by suction are discussed, the suction models become the 'zero-drag' model under certain suction angles. | Chao-rong ZHENG Yao-chun ZHANG | 2010 | Journal of Zhejiang University-Science A(Applied Physics & Engineering)2010，11，7： | 1 |
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