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高度非均一建筑群拖曳力分布特性的风洞实验.

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Název: 高度非均一建筑群拖曳力分布特性的风洞实验.
Alternate Title: Wind tunnel experimental study on the characteristics of drag force distribution for buildings with non-uniform heights.
Autoři: 王 鹿1, 李 彪2, 罗志文3, 刘 京4,5 liujinghit0@163.com
Zdroj: Journal of Harbin Institute of Technology. Social Sciences Edition / Haerbin Gongye Daxue Xuebao. Shehui Kexue Ban. Oct2025, Vol. 57 Issue 10, p93-102. 10p.
Témata: Drag force, Drag coefficient, Skyscrapers, Wind tunnel testing, Flow separation, Built environment
Abstract (English): The drag force of buildings in urban environment represent a complex and critical issue. Currently, most research usually regards buildings with uniform heights, ignoring the effect of the non-uniformity of building heights on the drag force distribution. To address this, this study proposes a height stratification method to calculate the sectional drag coefficient of buildings with non-uniform heights, Cdz . This method employs a sectional correction factor βz to adjust the drag coefficient of buildings with uniform heights to Cdz of buildings with non-uniform heights. Subquently, wind tunnel experiments are then conducted to investigate the effects of building height category N, layer type, and layout on the sectional drag coefficient of individual buildings and the total building array. The results show that the non-uniformity of building heights has a significant impact on the flow adjustment process. When the building height category, N, is 2 or 3, the layer layout has a minimal impact on βz. However, when N increases to 4, βz values of staggered layouts are higher than those of square layouts. When using the height stratification method to calculate Cdz of buildings with non-uniform heights, βz requires further parameterization if N≥4. The outcome of this study provide theoretical support for estimating drag force in urban buildings, enhancing the accuracy of building effect parameterization, and improving the precision of urban weather forecasting and pollutant dispersion calculations [ABSTRACT FROM AUTHOR]
Abstract (Chinese): 城市环境中建筑群所受到的风拖曳力是复杂而关键的问题。 目前, 大部分研究将建筑群视为均一高度, 忽略建筑群 高度非均一性对拖曳力的影响。 为此, 提出高度分层处理方案计算高度非均一建筑群的截面拖曳力系数 Cdz, 引入截面修正系 数 β z, 将高度均一建筑群的拖曳力系数修正为高度非均一建筑群的截面拖曳力系数 Cdz, 进而通过风洞实验研究建筑高度种 类、层类型及层布局对建筑单体和建筑群截面拖曳力系数影响。 结果表明: 建筑高度非均一性显著影响气流的流动调整过 程, 当建筑高度种类 N 为 2 或 3 时, 层布局对 β z的影响较小, 当 N 增加至 4 时, 交错式层布局的 β z高于行列式层布局的 β z; 采 用高度分层处理方案计算高度非均一建筑群的截面拖曳力系数, N ≥4 时, β z需进一步参数化。 研究结果为实际城市建筑群的 拖曳力估算提供理论支持, 提高城市参数化方案的准确性, 进而改善城市天气预报和污染物扩散计算的精度。 [ABSTRACT FROM AUTHOR]
Databáze: Supplemental Index
Popis
Abstrakt:The drag force of buildings in urban environment represent a complex and critical issue. Currently, most research usually regards buildings with uniform heights, ignoring the effect of the non-uniformity of building heights on the drag force distribution. To address this, this study proposes a height stratification method to calculate the sectional drag coefficient of buildings with non-uniform heights, Cdz . This method employs a sectional correction factor βz to adjust the drag coefficient of buildings with uniform heights to Cdz of buildings with non-uniform heights. Subquently, wind tunnel experiments are then conducted to investigate the effects of building height category N, layer type, and layout on the sectional drag coefficient of individual buildings and the total building array. The results show that the non-uniformity of building heights has a significant impact on the flow adjustment process. When the building height category, N, is 2 or 3, the layer layout has a minimal impact on βz. However, when N increases to 4, βz values of staggered layouts are higher than those of square layouts. When using the height stratification method to calculate Cdz of buildings with non-uniform heights, βz requires further parameterization if N≥4. The outcome of this study provide theoretical support for estimating drag force in urban buildings, enhancing the accuracy of building effect parameterization, and improving the precision of urban weather forecasting and pollutant dispersion calculations [ABSTRACT FROM AUTHOR]
ISSN:10091971
DOI:10.11918/202409002