太阳能定日镜结构风载体型系数风洞试验研究

Wind Tunnel Test Study on the Wind Load Shape Coefficient of Heliostat

对定日镜模型进行了风洞试验研究,分析得到镜面板风压系数随风向角的变化规律;绘出了不利工况下的平均风压系数等值线图,清楚地显示出镜面板不利风载下的风压分布特征;进一步分析得到镜面板24个单体板块的平均净风压系数极值及分布,将分析得到的风载体型系数结果与建筑规范和相关文献所提供的结果进行对比.对比结果表明,所得结果可为定日镜结构的抗风设计提供参考依据.

The testing conditions and the main results of the model of a heliostat were introduced. The variation of mean wind pressures coefficient and its regularity were given, and the mean net wind pressure contours for the worst conditions were presented, which showed clearly the characteristics of the wind pressure distributions on the mirror of the heliostat. According to the analyses, the mean net wind pressure coefficients and wind load shape coefficients for the most unfavorable conditions were presented. A comparison of the result from the code method with documentations has indicated that the wind load shape coefficients from the code method and documentations are smaller. The experimental results have provided the reference basis for structure wind - resistance design.