摘要
定日镜单元子镜的面形对于定日镜在目标靶上形成良好的光斑质量至关重要。文章首先根据定日镜的实际参数,利用有限元方法拟合出了定日镜单元子镜模型,然后通过三维坐标机装置测量了水平姿态下实际定日镜单元子镜的面形,结果显示,水平姿态下的测试结果和计算结果相一致,验证了有限元模型的正确性。根据建立的有限元模型,计算了单元子镜在不同俯仰角、风速和玻璃反射镜厚度等工况和结构下的单元子镜变形,结果显示,单元子镜面形是一个复杂曲面,单元子镜的变形与俯仰角相关,同时PVB薄膜的弹性模量对单元子镜的变形也有很大影响。在俯仰角为0°的情况下,风速与单元子镜最大变形之间的关系可以表达为二次多项式,此外,在风速为25 m/s的情况下,单元子镜最大mises应力为39.87 MPa。
Perfect reflecting mirror surface shape of heliostat facet is a very important factor to make good beam on the aim target. Due to the gravity,wind load and manufacturing errors etc.,the actual reflecting mirror surface shape has always some difference with the design surface shape. In this paper,the reflecting mirror surface shape of the heliostat facet was tested by a three-dimensional coordination testing equipment,and the reflecting mirror surface shape was simulated and analyzed using the finite element method（FEM） with different elevation angles of the facet,wind velocity and glass plate thickness of reflecting mirror. The results show： the reflecting mirror surface shape is a complex curve surface. The simulation results are the same with the testing results. Displacement of mirror surface depends on the elevation angle of the facet. The elastic modulus of PVB film has the most effect on the displacement of mirror surface. Relation between wind velocity and displacement of mirror surface can be expressed with a quadratic polynomial.When wind velocity is 25 m/s,the maximum mises stress of reflecting mirror is 39.876 MPa.
出处
《可再生能源》
CAS
北大核心
2015年第12期1786-1792,共7页
Renewable Energy Resources
基金
中国华能集团科技项目(HNKJ13-H21)
国家能源应用技术研究及工程示范项目(NY20130101,NY20130102,NY20130103)
