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中南大学学报(自然科学版)

Journal of Central South University

第51卷    第6期    总第310期    2020年6月

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文章编号:1672-7207(2020)06-1606-09
不同湍流边界层中高层建筑模型气动力特性
李石清1, 2,王汉封2,罗元隆3,罗振兵1

(1. 国防科技大学 空天科学学院,湖南 长沙,410073;
2. 中南大学 土木工程学院,湖南 长沙,410075;
3. 淡江大学 工学院,中国 台北,251301
)

摘 要: 在模型高宽比(H/d)为5,基于来流风速 与模型宽度d的雷诺数Red =6.0×104时,通过风洞试验研究2种湍流边界层中正方形截面高层建筑简化模型的气动力特性,并对模型表面脉动风压进行本征正交分解法(POD)分析。研究结果表明:湍流边界层中模型时均阻力系数 的最大值出现在自由端附近,脉动升力系数 的最大值出现在模型中间高度附近。不同湍流边界层中模型侧面中间高度处平均风压系数 与脉动风压系数 的分布差异较大;在湍流度较小的工况C中,脉动升力的周期性较强,两侧风压脉动由反对称状态主导;在湍流度较大的工况A中,模型侧面可能出现间歇性再附,两侧风压脉动转变为对称状态主导,脉动升力减小,且周期性减弱。

 

关键字: 高层建筑;有限长方柱;湍流边界层;气动力特性;本征正交分解法(POD)

Aerodynamic characteristics of square high-rise building models in different turbulent boundary layers
LI Shiqing1, 2, WANG Hanfeng2, LO Yuanlung3, LUO Zhenbing1

1. College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China;
2. School of Civil Engineering, Central South University, Changsha 410075, China;
3. College of Engineering, Tamkang University, Taipei 251301, China

Abstract:The characteristics of aerodynamic forces on a simplified square high-rise building model immersed in two different turbulent boundary layers were experimentally investigated through wind tunnel tests, and the proper orthogonal decomposition(POD) method was adopted to analyze the fluctuation pressure on the model, when the model aspect ratio H/d was 5, and the Reynolds number was 6.0×104 which was based on the oncoming flow velocity and the width d. The results show that the maximum appears near the free end, while the maximum appears near the middle-span of the model. The distribution of and on the two side faces of the model exerts obvious difference near the middle-span region for the two tested turbulent boundary layers. Particularly, for the one with lower turbulence intensity, the periodicity of lift is relatively stronger, and the pressure on side faces is dominated by anti-symmetrical mode. For the one with higher turbulence intensity, the predominant mode of pressure on side faces becomes symmetrical, resulting in smaller fluctuation lift with weakened periodicity.

 

Key words: high-rise buildings; finite-length square cylinder; turbulent boundary layer; aerodynamic characteristics; proper orthogonal decomposition(POD)

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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