The Heliostat Design Wind Loads Spreadsheet

Wind load predictions for heliostats are not provided in design codes because of their non-standard shape and the changes in wind velocity and turbulence in the lowest 10 m of the atmospheric boundary layer (ABL). The Heliostat Design Wind Loads Spreadsheet estimates the design wind loads on different heliostat sizes based on:(1) the dependence of wind load coefficients on turbulence intensity derived in our wind tunnel experiments,(2) the expected wind speed and turbulence intensity profiles in the full-scale ABL.Mean and peak design loads are calculated for a square-shaped heliostat based on the mean wind speed and the relevant aerodynamic coefficient. Critical load cases show the maximum value of the heliostat loads and aerodynamic coefficients for each load case.

鉴于定日镜（heliostat）形状非标准化，且大气边界层（Atmospheric Boundary Layer，ABL）底部10米范围内的风速与湍流特性存在变化，现行设计规范尚未纳入定日镜的风荷载预测方法。《定日镜设计风荷载计算电子表格》（Heliostat Design Wind Loads Spreadsheet）依据以下两项依据对不同尺寸定日镜的设计风荷载进行估算：(1) 本研究风洞试验推导得到的风荷载系数与湍流强度的依赖关系；(2) 足尺大气边界层内的预期风速与湍流强度分布廓线。基于平均风速与对应气动系数，可计算得到方形定日镜的平均设计荷载与峰值设计荷载。各关键荷载工况可展示对应荷载工况下定日镜荷载与气动系数的最大值。