兆瓦级太阳能热气流发电站风荷载的数值模拟

针对发电功率为100 MW的太阳能热气流发电系统进行几何尺寸设计,运用计算流体力学(CFD)方法对兆瓦级太阳能热气流发电站的平均风荷载进行数值模拟,得到烟囱和集热棚内、外风场和风压分布规律.根据风工程理论计算烟囱表面的压力系数和风载体型系数,与规范中圆截面构筑物的体型系数以及相关结构的风洞试验值进行比较.结果表明,模拟值与规范值基本吻合,这说明运用CFD方法对超高耸结构进行风荷载模拟是可行的.绘制体型系数曲线,研究烟囱沿圆周方向和高度方向平均风荷载的分布规律,结果表明,圆截面高耸结构的体型系数随高度的增大而减小.

Numerical simulation of wind load on solar thermal power station

Geometrical dimension was designed for the solar thermal power station with 100 MW output. The computational fluid dynamics (CFD) method was used to simulate the average wind load on the station, and the distribution of wind field and wind pressure in and out of the chimney and collector was obtained. The pressure coefficient and the shape coefficient were calculated according to the theory of wind engineering, and compared with the data obtained from wind load code and wind tunnel test. Results showed that the simulation results accorded with the code value. It is feasible to simulate the wind load of super tall structures by CFD method. The shape coefficient curve was draw to analyze the distribution of the average wind load along the circumference and height directions. Results show that the shape coefficient of circular tall structure decreases with its altitude．