塔式太阳能定日镜镜面挠曲变形研究

RESEARCH ON FLEXURE DEFORMATION OF HELIOSTAT REFLECTOR OF TOWER SOLAR POWER

基于弹性薄板弯曲理论,分别采用镜面挠曲变形的大、小挠度弯曲模型对不同边界条件下定日镜镜面的力学模型进行研究,并通过有限元仿真验证理论模型的正确性,同时对影响镜面挠厚比的镜面风压和长厚比进行分析。结果表明:基于四点支承弯曲理论的挠度曲线与有限元挠度曲线吻合度很高,最大偏差不超过5%;结合中国对定日镜结构抗风设计的风速要求,当长厚比a/h>200时,应采用四点支承大挠度弯曲模型计算定日镜镜面挠曲变形。

Based on the elastic thin plate deflection theory, the mechanical models of heliostat reflector under different boundary conditions were researched by using smalldeflection bending model and largedeflection bending model, respectively. And then the finite element model was established to verify the correctness of the theoretical model. In addition, the deflection to thicknessratios of reflector, which was influenced by wind pressure on reflector and length to thickness ratios, were analyzed. The results showed that the deflection curve based on the fourpoints bearing bending theory is consistent with the finite element simulation curve, and the maximum deviation is less than 5%. Considering the domestic wind speed requirements for wind resistance design the model of largedeflection bending of fourpoints bearing is reflector. of heliostat, when the length to thickness ratio is a/h〉200, more reasonable to calculateflexural deformation of heliostat