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通过对槽式聚光镜模型进行风洞测压试验,分析镜面平均风压和脉动风压分布特性,并给出部分测点的脉动风压功率谱图,对影响脉动风压分布的因素进行分析。同时还探讨脉动风压的概率分布,并对峰值因子的取值给出建议。研究结果表明:镜面竖向仰角及水平风向角不同时影响脉动风压分布的主导因素不同;镜面部分面积的风压分布在某些工况下有明显非高斯特性;抗风设计时可采用目标概率法来确定镜面的峰值因子以防止部分区域的风压保证率过高。此外还给出镜面各分区的峰值风压系数值。
Through the wind tunnel pressure measurement test on the trough condensing mirror model, the distribution characteristics of the average wind pressure and the pulsating wind pressure on the mirror surface are analyzed. The pulsating wind pressure power spectrum of some measuring points is given and the factors affecting the distribution of the pulsating wind pressure are analyzed. At the same time, the probability distribution of pulsating wind pressure is also discussed, and the suggestions of the peak factor are given. The results show that the main factors that affect the distribution of fluctuating wind pressure are different when the vertical elevation of the mirror and the horizontal wind direction angle are different. The wind pressure distribution of the mirror part area has obvious non-Gaussian characteristics in some working conditions. Probability method to determine the mirror peak factor to prevent part of the wind pressure guarantee rate is too high. In addition, it also gives the value of the peak wind pressure coefficient of each mirror zone.