Research On Wind Load And Wind-induced Vibration Response Of Tower Heliostat In Solar Field

The tower heliostat is a very important light-gathering device.It occupies a large area,a large number and a large construction cost in the solar power tower plant.The control load of the structure is wind load.At present,the research on the wind load and wind-induced vibration response of the tower heliostat structure is not sufficient,and there is no special code to guide the design.Studying the wind load and wind-induced vibration response of heliostat structure is helpful to improve the safety of heliostat structure on the one hand,and is beneficial to reduce the cost of power station on the other hand,which is of great significance.This paper studied wind pressure distribution,aerodynamic coefficients,wind-induced vibration response of the single tower heliostat and interference effects of the group of the tower heliostat through wind tunnel tests,finite element analysis and other methods,which provided a good basis for the wind-resistant design of the structure in practical engineering.This paper mainly includes the following contents:（1）Through the pressure measurement wind tunnel tests of the rigid model of the heliostat structure of 40 square meters and 140 square meters,the characteristics of the net wind pressure distribution of the two area heliostats were compared and analyzed,and the influence of wind attack angle and wind direction angle on the net wind pressure of two kinds of heliostats were studied.The wind load shape coefficients of the heliostat structure were calculated and analyzed,and compared with the relevant standard value.（2）Based on the rigid model force measurement wind tunnel tests of the 40m~2heliostat structure,the aerodynamic coefficient s were studied.They were compared with the aerodynamic coefficients obtained from the rigid model pressure measurement wind tunnel tests,then the influence of supporting structure on wind load was obtained.（3）Based on the rigid model pressure measurement wind tunnel test s,the finite element analysis of the wind-induced vibration response of the heliostat s tructure with two areas of 40 square meters and 140 square meters was conducted,and the results of the two areas were compared.A vibration test of aeroelastic model of a 40m~2 heliostat structure was carried out,and the results were compared with the res ults of finite element analysis.The wind vibration coefficients of the heliostat structure were calculated and analyzed,and compared with the relevant standard value.（4）The pressure measurement wind tunnel tests of the group mirror rigid model of the 40m~2 heliostat structure were carried out,and the influence of the interference effect on the aerodynamic coefficient,wind load shape coefficient and wind vibration coefficient was studied.The heliostat mirror field were divided into di fferent areas,and the interference coefficients of different areas were given.The wind load value method of structural design considering the interference effect was discussed,which provided a reference for structural design.