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首页> 外文期刊>Advances in Structural Engineering >A new atmospheric boundary layer wind tunnel simulation methodology for wind effects on large cooling towers considering wind environment variations
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A new atmospheric boundary layer wind tunnel simulation methodology for wind effects on large cooling towers considering wind environment variations

机译：考虑风环境变化的大型冷却塔风影响的新型大气边界层风洞模拟方法

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摘要

The traditional atmospheric boundary layer wind tunnel model test practice employs wind fields, the flow characteristics of which are in accordance with the empirical formulae of the atmospheric turbulence presented in Codes of Practice and monographs. However, the empirical formulae presented in Codes of Practice and monographs cannot truthfully reflect the high variations of the realistic atmospheric turbulence which sometimes aggravates wind effects on structures. Based on model tests conducted in a multiple-fan actively controlled wind tunnel, it is found that most wind effects on large cooling towers change monotonically with the increase in free-stream turbulence, and the model test results are more unfavorable for a flow field of low turbulence intensity than for a flow field of high turbulence intensity with respect to the measured coherences. Thus, a new atmospheric boundary layer wind tunnel simulation methodology for wind effects on circular cylindrical structures is proposed to overcome the deficiency of the traditional atmospheric boundary layer wind tunnel model tests. The new simulation methodology includes the simulation of two realistic atmospheric boundary layer flow fields with the highest and the lowest turbulence intensities in the wind tunnel and the envelopment of model test results obtained in the two flow fields (e.g. the mean and fluctuating wind pressure distributions, the power spectral density, the coherence function, and the correlation coefficient). The superiority of the new atmospheric boundary layer wind tunnel simulation methodology over the traditional model test practice is demonstrated by comparing the model test results with the full-scale measurement data.
机译：传统的大气边界层风洞模型测试实践使用风场，其流场特性符合《操作规范》和专论中提出的大气湍流的经验公式。但是，《实践准则》和专着中提出的经验公式无法如实反映真实的大气湍流的高变化，有时会加剧结构上的风影响。基于在多风扇主动控制风洞中进行的模型测试，发现大型冷却塔上的大多数风效应都随着自由流湍流的增加而单调变化，并且模型测试结果对于管道的流场更不利。相对于测得的相干性而言，湍流强度要比湍流强度高的流场低。因此，为克​​服传统的大气边界层风洞模型试验的不足，提出了一种新的大气边界层风洞模拟方法。新的模拟方法包括对风洞中湍流强度最高和最低的两个实际大气边界层流场进行仿真，以及在两个流场中获得的模型测试结果的包络（例如均值和波动的风压分布，功率谱密度，相干函数和相关系数）。通过将模型测试结果与满量程测量数据进行比较，证明了新的大气边界层风洞模拟方法相对于传统模型测试实践的优越性。

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