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小宽厚比串列双矩形柱的气动干扰效应及产生机理

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为研究小宽厚比串列双矩形柱的气动干扰效应及流场机理,采用风洞试验和大涡模拟相结合的方法得到了宽厚比B/D(顺风向宽度B与横风向厚度D之比)为1∶4的串列双矩形柱在不同间距比L/B(双矩形柱的中心距L与顺风向宽度B之比,其范围为1.2～8.0)下的气动力系数、风压系数、斯托罗哈数以及流场特性,并与单矩形柱的进行了对比分析.结果表明:即使L/B达到8.0,双矩形柱的气动干扰效应仍不可忽略,上游矩形柱的平均阻力系数、下游矩形柱的脉动升力系数和双矩形柱的斯托罗哈数均表现出了不同程度的放大效应,最大分别为单矩形柱的1.4倍、2.1倍和1.2倍;在L/B＜4.0时,绕流表现为单钝体流态,柱间分离泡的形成是导致双矩形柱空隙面负平均风压系数和局部脉动风压系数增大的原因;在L/B≥4.0时,流场剪切再附流态出现,剪切层间歇性再附着造成了下游矩形柱侧风面局部脉动风压系数的增大.
Study on aerodynamic interference effect and mechanism of two tandem rectangular cylinders with a small aspect ratio
In order to study the aerodynamic interference effect and flow field mechanism of two tandem rectangular cylinders with a small aspect ratio,the aerodynamic force coefficients,wind pressure coefficient,Strouhal number,and flow field performance of the two cylinders with a width-thickness ratio B/D(the ratio of downwind width B to crosswind thickness D)of 1∶4 at different spacing ratios L/B(the ratio of center distance L of the two rectangular cylinders to downwind width B,the L/B varies from 1.2 to 8.0)were obtained by means of both wind tunnel test and large eddy simulation.The results of the two rectangular cylinders were compared with those of the single one.The results show that even if L/B reaches 8.0,the aerodynamic interference effect of the two rectangular cylinders is still not negligible.The mean drag coefficient of the upstream cylinder,the fluctuating lift coefficient of the downstream cylinder,and the Strouhal number of both cylinders exhibit varying levels of amplification effect,with the maximum being 1.4 times,2.1 times,and 1.2 times of the single one,respectively.When L/B＜4.0,the flow exhibits a single bluff body flow pattern.The formation of separation bubbles between the two cylinders is the reason for the increase of the negative mean wind pressure coefficient and local fluctuating wind pressure coefficient on the gap surface of the two rectangular cylinders.While L/B ≥4.0,a shear layer reattachment flow pattern appears.Intermittent reattachment of the shear layers causes an increase in the local fluctuating wind pressure coefficient on the side surface of the downstream rectangular cylinder.

two tandem rectangular cylinderswind tunnel testlarge eddy simulationaerodynamic characteristicsflow field mechanismspacing ratio

姜会民、杨群、阮礼君、范佳豪、刘小兵

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石家庄铁道大学土木工程学院,河北石家庄 050043

河北省风工程和风能利用工程技术创新中心,河北石家庄 050043

石家庄铁道大学省部共建交通工程结构力学行为与系统安全国家重点实验室,河北石家庄 050043

串列双矩形柱 风洞试验 大涡模拟 气动特性 流场机理 间距比

国家自然科学基金项目国家自然科学基金项目中央引导地方科技发展资金项目河北省自然科学基金创新研究群体项目

5200827352078313236Z5407GE2022210078

2024

10.14006/j.jzjgxb.2023.0391

建筑结构学报
中国建筑学会

建筑结构学报

CSTPCD北大核心
影响因子：1.546
ISSN：1000-6869
年,卷(期)：2024.45(5)
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