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Investigation of peak wind loads on tandem heliostats in stow position

机译：收起位置的串联定日镜的最大风载荷研究

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This paper investigates the effects of turbulence in the atmospheric boundary layer (ABL) on the peak wind loads on heliostats in stow position in isolation and in tandem configurations with respect to the critical scaling parameters of the heliostats. The heliostats were exposed to a part-depth ABL in a wind tunnel using two configurations of spires and roughness elements to generate a range of turbulence intensities and integral length scales. Force measurements on different-sized heliostat mirrors at a range of heights found that both peak lift and hinge moments were reduced by up to 30% on the second tandem heliostat when the spacing between the heliostat mirrors was close to the mirror chord length and converged to the isolated heliostat values when the spacing was greater than 5 times the chord length. Peak wind loads on the tandem heliostat were above those on an isolated heliostat for an integral-length-scale-to-chord-length ratio Lt/c of less than 5, whereas tandem loads were 30% lower than an isolated heliostat at Lfic of 10. The reduced loads on the tandem heliostat corresponded to a shift to higher frequencies of the fluctuating pressure spectra, due to the break-up of large eddies by the upstream heliostat. (C) 2018 Elsevier Ltd. All rights reserved.
机译：本文针对定日镜的关键比例缩放参数，研究了大气边界层（ABL）中的湍流对定风镜在收起位置处于隔离和串联配置时对峰值风载荷的影响。定日镜在风洞中暴露于部分深度的ABL中，使用两种配置的尖顶和粗糙度元件来产生一定范围的湍流强度和整体长度标尺。在一定高度范围内对不同尺寸的定日镜进行的力测量发现，当定日镜之间的间距接近镜弦长度并收敛到第二个定日镜时，峰值升力和铰链力矩都降低了多达30％。当间距大于弦长的5倍时，孤立的定日镜值。当积分长度标度与弦长之比Lt / c小于5时，串联定日镜的峰值风载荷高于独立定日镜的风载荷，而Lfic时的串联风量比独立定日镜的风载荷低30％。 10.由于上游定日镜将大涡旋分解，因此串联定日镜上的负载减少对应于波动压力谱的较高频率。 （C）2018 Elsevier Ltd.保留所有权利。

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