[1] Cheng Xiaoxiang,. Updating empirical results of wind loads on cooling towersfor turbulence intensity effects [J]. Journal of Southeast University (English Edition), 2021, 37 (4): 413-420. [doi:10.3969/j.issn.1003-7985.2021.04.011]

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Updating empirical results of wind loads on cooling towersfor turbulence intensity effects()

基于湍流强度效应的冷却塔表面风荷载经验公式修正

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

37

Issue:

2021 4

Page:

413-420

Research Field:

Civil Engineering

Publishing date:

2021-12-20

Info

Title:

Updating empirical results of wind loads on cooling towersfor turbulence intensity effects

基于湍流强度效应的冷却塔表面风荷载经验公式修正

Author(s):

Cheng Xiaoxiang

School of Civil Engineering, Southeast University, Nanjing 211189, China

程霄翔

东南大学土木工程学院, 南京 211189

Keywords:

cooling tower;  empirical formula;  wind tunnel test;  full-scale measurement;  turbulence intensity

冷却塔;  经验公式;  风洞试验;  现场实测;  湍流强度

PACS:

TU317.1;TU271.1

DOI:

10.3969/j.issn.1003-7985.2021.04.011

Abstract:

Variations of wind effects on large cooling towers observed at different turbulence intensities for our previous full-scale measurements might be caused by the inherent uncertainties in our physical experiments. Accordingly, the one-way analysis of variance(ANOVA)technique is employed for analyzing the data measured on the prototype Pengcheng cooling tower. Because ANOVA indicates that the variations of full-scale wind effects are basically the effects of turbulence intensity, the empirical results of wind loads on cooling towers obtained by generalizing physical experimental data without considering the turbulence intensity effects are updated using model test results obtained in multiple flow fields. The empirical fluctuating wind pressure distribution is updated based on the fact that the fluctuating wind pressure coefficient linearly increases with the increase in the turbulence intensity, and the empirical formulae of the spectra and the coherences is updated based on conservative assumptions. Comparisons of the empirical results and full-scale measurement data suggest that the original empirical results are either too conservative or unsafe for use. However, economic efficiency and conservativeness will be balanced if the updated empirical results are employed for the wind engineering design.

前期彭城电厂大型冷却塔表面风荷载现场实测中不同湍流强度工况下塔表风荷载的差异可能是由物理试验自身的不确定性引起, 因此首先对实测数据开展了单因素方差分析, 获得了物理试验不同湍流强度工况下塔表风荷载变化基本为湍流强度效应的结论.基于此结论, 使用不同流场中的风洞试验结果对未考虑湍流强度效应的传统塔表风荷载经验公式进行了修正.对于脉动风压分布经验公式的修正基于脉动风压系数随湍流强度改变线性变化这一物理现象, 而对于频域经验公式的修正基于保守化的假定.通过比较经验公式和现场实测结果, 发现未经修正的脉动风压分布经验公式过于保守, 而未经修正的频域经验公式偏不安全.使用修正后的经验公式进行结构设计, 经济性和安全性得以平衡.

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Memo

Memo:

Biography: Cheng Xiaoxiang(1985—), male, doctor, associate research fellow, cxx_njut@hotmail.com.
Foundation items: The National Natural Science Foundation of China(No. 51908124), the China Postdoctoral Science Foundation(No. 2016M601793).
Citation: Cheng Xiaoxiang. Updating empirical results of wind loads on cooling towers for turbulence intensity effects[J].Journal of Southeast University(English Edition), 2021, 37(4):413-420.DOI:10.3969/j.issn.1003-7985.2021.04.011.

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