Aerodynamic characteristics of steel tubular transmission tower in different flow fields
Rong BIAN1(),Wen-juan LOU2,*(),Hang LI2,Xia-shuang ZHAO3,Li-gang ZHANG3
1. State Grid Zhejiang Economic Research Institute, Hangzhou 310027, China 2. Institute of Structural Engineering, Zhejiang University, Hangzhou 310027, China 3. Zhejiang Huayun Electric Power Engineering Design and Consulting Co. Ltd, Hangzhou 310027, China
Tower body section and single windward frame models with different solidity ratios and aspect ratios were designed and constructed based on the section size of a typical panel at 1/3 height of SZ27102 steel tubular transmission tower. Wind tunnel tests were carried out in uniform laminar flow and uniform turbulent flow fields based on high-frequency-force-balance technique. The drag coefficients of single windward frames, shielding factors and overall drag coefficients of tower body section were measured and analyzed. Results showed that high intensity turbulence reduced the drag coefficients of single frames and increased the shielding factors, therefore the overall drag coefficients of tower body section measured in two flow fields were almost equal. The drag coefficients of single frames suggested by Chinese code were smaller than the measured values, particularly when the solidity ratio was small. It is suggested that the drag coefficients of single frames in Chinese code should be increased with consideration of the effect of solidity ratio. Some adjustment for the shielding factors are suggested as the values suggested by Chinese code are larger than the measured values and those suggested by British code.
Rong BIAN,Wen-juan LOU,Hang LI,Xia-shuang ZHAO,Li-gang ZHANG. Aerodynamic characteristics of steel tubular transmission tower in different flow fields. Journal of ZheJiang University (Engineering Science), 2019, 53(5): 910-916.
Tab.1Basic parameters of tower body section and single frame models
Fig.1Experimental pictures of tower body section models
Fig.2Vertical view of aspect ratio of section model
Fig.3Wind tunnel force measuring test of steel tubular transmission tower section model
Fig.4Physical map of vertical grilles in wind tunnel
Fig.5Profiles of turbulence intensity in uniform turbulent flow field
Fig.6Variation of drag coefficients of single frames with wind velocity in two wind flow fields
Fig.7Variation of drag coefficients of tower body section with wind velocity in two wind flow fields
Fig.8Variation of shielding factors with wind velocity in two wind flow fields
Fig.9Variation of drag coefficients of single frames with solidity ratio
Fig.10Variation of drag coefficients of body section of steel tubular tower with solidity ratio
$b/a$
${C_{\rm{D}}^{(2)}}$试验值
中国规范（亚临界）
英国规范（亚临界）
${C_{\rm{D}}^{(2)}}$
偏差
${C_{\rm{D}}^{(2)}}$
偏差
1.0
1.97
1.96
?0.5%
1.73
?12.2%
1.5
2.01
1.98
?1.5%
1.73
?12.6%
2.0
2.14
2.01
?6.1%
1.74
?18.7%
Tab.2Comparison of drag coefficients of tower body section with different aspect ratios
Fig.11Variation of shielding factors of steel tubular tower with different solidity ratios
b/a
η试验值
中国规范
英国规范（亚临界）
η
偏差
η
偏差
1.0
0.69
0.88
27.5%
0.57
?17.4%
1.5
0.72
0.91
26.4%
0.58
?19.4%
2.0
0.83
0.94
13.3%
0.59
?28.9%
Tab.3Comparison of shielding factors of steel tubular tower with different aspect ratios
b/a
η
$ \phi$=0.1
$ \phi$=0.2
$ \phi$=0.3
1) 注：括号内为中国规范[14]的建议值.
1.0
0.90（1.00）1)
0.75（0.85）
0.70（0.69）
2.0
?
0.85（0.92）
?
Tab.4Proposed values of shielding factors of steel tubular tower with different aspect ratios
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