等离子体激励对低矮建筑屋面风压的影响  

Influence of plasma excitation on wind pressure for the roof of low-rise building

作　　者：李正农[1] 邹正韬 LI Zhengnong;ZOU Zhengtao(Key Laboratory of Building Safety and Energy Efficiency of the Ministry of Education,Hunan University,Changsha 410082,China)

机构地区：[1]湖南大学建筑安全与节能教育部重点实验室,长抄410082

出　　处：《扬州大学学报（自然科学版）》2021年第4期64-70,共7页Journal of Yangzhou University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51478179).

摘　　要：为对低矮建筑屋面局部风压进行控制,对屋面安装等离子体激励装置改善流场环境的效果进行研究.通过在不同屋面来流风速下开展风洞低矮建筑模型测压试验,发现屋面前缘所受负压远大于屋面其他部位,故分别在屋面前缘施加顺风向和逆风向等离子体激励进行试验.对比激励施加前后屋面前缘的风压分布变化,分析激励方式对屋面前缘风压的控制效果.研究结果表明:不同屋面来流风速下两种等离子体激励施加方法均能改变屋面前缘风压,在屋面前缘施加顺风向等离子体激励可降低屋面前缘负压,而施加逆风向激励则对屋面前缘负压起增大效果.两种施加等离子激励方式对屋面前缘负压的相对影响均随来流风速的增大而降低.A plasma actuator is installed on the roof of a low-rise building and its effects on improving the flow field is studied in order to control local wind pressure on the roof.Based on a reduced scale model,the wind tunnel test is firstly carried out under different approaching flow velocities at high level of the roof.The results show that there always exists the highest negative pressure in the leading edge of windward slope of each case.Therefore,two kinds of wall jets pointing in completely opposite directions-the along wind and the against wind respectively,are applied to the roof.By comparing the wind pressure distribution of the leading edge of windward slope before and after the excitation,the control effects and laws of different plasma wall jets on the wind pressure are obtained.The results indicate that two wall jets can all change the wind pressure of the leading edge of the roof with different approaching flow velocities.The along wind wall jets can decrease the negative pressure in the leading edge of the roof.However,the against wind wall jets behave quite-ly the reverse.The control effects of these two wall jets on the negative pressure of the leading edge decrease as the approaching flow velocity increases.

关 键 词：等离子体激励 风洞试验 流动控制 风压变化 低矮建筑 

分 类 号：TU312[建筑科学—结构工程]