蝶形防风网的体型系数和角度风分配系数

沈国辉1,韩康辉1,卢坚2,张京京2

振动与冲击 ›› 2022, Vol. 41 ›› Issue (14) : 99-104.

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振动与冲击 ›› 2022, Vol. 41 ›› Issue (14) : 99-104.
论文

蝶形防风网的体型系数和角度风分配系数

  • 沈国辉1,韩康辉1,卢坚2,张京京2
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Shape coefficients and skewed wind loading distribution factors of butterfly windbreak nets

  • SHEN Guohui1,HAN Kanghui1,LU Jian2,ZHANG Jingjing2
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文章历史 +

摘要

针对蝶形防风网的风荷载采用天平测力风洞试验方法进行研究,获得不同风向角两种开孔率防风网的气动力系数,分析单体和有周围防风网干扰下气动力系数的差异,并将气动力系数与各国规范及文献结果进行对比,最后给出了蝶形防风网的体型系数和角度风分配系数的建议值。研究表明蝶形防风网气动力系数的雷诺数效应不显著;对于30%开孔率的防风网,单体情况下正面风吹的体型系数大于背面风吹,而有周围防风网干扰情况下规律则相反,其原因为有周围防风网干扰情况下背面风吹的兜风效应更显著;防风网体型系数的试验值与AS/NZS规范非常接近;30%和40%开孔率防风网体型系数的建议值分别为1.06和1.10,垂直网面的角度风分配系数建议采用风向角的余弦值。
关键词:蝶形防风网;体型系数;风洞试验;开孔率;角度风分配系数

Abstract

In order to obtain the wind loading of butterfly windbreak nets, force balance testing methods in a wind tunnel were employed. The aerodynamic coefficients of the windbreak nets with two opening ratios under different azimuths were obtained. The difference of aerodynamic coefficients between the isolated case and the interference case was analyzed. Then the testing results were compared with those obtained from various countries’ specifications and literatures. Finally, shape coefficients and skewed wind loading distribution factors of butterfly windbreak nets are recommended. Results show that the Reynolds effect of aerodynamic coefficients of windbreak nets is not significant. For the windbreak net with 30% opening ratio, its shape coefficients in the windward direction is larger than that in the leeward direction for the isolated case, whereas the coefficients in the windward direction is smaller than that in the leeward direction for the interference case. This is almost due to the factor that the wind catching effect will be more significant for the interference case. The testing results of the shape coefficients with different opening ratios are very close to those regulated in the AS/NZS specifications. The shape coefficients of the windbreak nets with opening ratios of 30% and 40% are recommended to be 1.06 and 1.10, respectively. And the skewed wind loading distribution factors in the vertical direction are suggested to be the cosine function of the wind azimuth.
Key words: butterfly wind net, shape coefficient, wind tunnel test, opening ratio, skewed wind loading distribution factor

关键词

蝶形防风网 / 体型系数 / 风洞试验 / 开孔率 / 角度风分配系数

引用本文

导出引用
沈国辉1,韩康辉1,卢坚2,张京京2. 蝶形防风网的体型系数和角度风分配系数[J]. 振动与冲击, 2022, 41(14): 99-104
SHEN Guohui1,HAN Kanghui1,LU Jian2,ZHANG Jingjing2. Shape coefficients and skewed wind loading distribution factors of butterfly windbreak nets[J]. Journal of Vibration and Shock, 2022, 41(14): 99-104

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