摘要
采用数值模拟方法研究了吸气控制下高层建筑模型的减阻性能,分析了吸气位置、吸气角、开孔宽度和吸气流量(系数)等参数对减阻的影响规律。结果表明:当外界来流风速不变时,吸气流量越大,减阻效果越好,该文吸气角为15o、吸气流量系数为―0.0686时模型的阻力折减系数CDR达到0.523;吸气角和开孔大小对CDR的影响较小。当吸气控制沿高度变化时,各吸气段的顺风向风压减阻效率ηDR和弯矩减阻效率ηMR均大于1.0,其数值随高度的增加先增大后减小,最大值出现在0.425m处。最后给出了风压折减系数关于吸气流量系数和吸气高度的经验公式。
As the drag force of the bluffbody is greatly increased due to the separation flow, the suction method is proposed to investigate the performance of the Drag Reduction （DR） to a high-rise building via numerical method. The effects of the suction position, suction angle, slot size and flux coefficient on the DR are analyzed. The results show that the DR is more significant with larger flux coefficient, and the Coefficient of the Drag Reduction （CDR） of the model under the flux coefficient of-0.0686 and the suction angle of 15° arrives at 0.523, however, the function of the suction angle and slot size is little for DR. As the suction is moving along the vertical direction of the model, the results show that the efficiencies of the Drag Reduction and Moment Reduction of any suction section are all greater than 1.0. When the height is increased, the efficiencies increase firstly and decrease afterwards, and the greatest values happen at the height of 0.425 m. Lastly, the formulae are regressed for the Coefficient of Pressure Reduction with regard to the flux coefficient and the suction height.
出处
《工程力学》
EI
CSCD
北大核心
2009年第A01期51-56,共6页
Engineering Mechanics
关键词
高层建筑
风荷载减阻
数值模拟
吸气控制
风压折减系数
high-rise building
reduction of wind load
numerical simulation
suction control
coefficient of pressure reduction
