基于刚性模型与气弹模型风洞试验对比的塔式定日镜风振响应研究

A study on wind vibration response of a tower heliostat based on comparison of a rigid model and an aeroelastic model wind tunnel test

塔式定日镜是塔式太阳能光热发电站中重要的聚光设备,设计时控制荷载为风荷载。通过ANSYS有限元软件建立塔式定日镜结构的有限元模型,经过模态分析可知结构频率分布比较密集,风攻角的改变对定日镜结构的低阶模态影响不大。基于刚性模型测压风洞试验,对塔式定日镜进行风振响应有限元分析,并进行气弹模型测振试验,两者的误差在10%以内。根据有限元分析和气弹模型测振试验的结果可知,影响结构风振的模态主要是前3阶,主檩条端部位置的位移响应最大。结构设计时风振系数建议取为1.57。

A tower heliostat is an important concentrating device in a solar power tower plant,and the control load is wind load.A finite element model of a tower heliostat structure was established in ANSYS.Modal analysis shows that the frequency distribution of the structure is dense,and the change of the wind attack angle has little effect on the low-order mode of the heliostat structure.Based on the pressure measurement wind tunnel test of the rigid model,the wind-induced vibration response of the tower heliostat was analyzed,and the aeroelastic model vibration test was carried out.The errors between the two are within 10%.The results show that the modes that affect the wind-induced vibration of the structure are mainly the first 3 orders,and the displacement response at the end of the main purlin is the largest.The wind vibration coefficient is recommended to be 1.57.