Research On Aerodynamic Control Of The Square Section Bridge Tower’s Vibration Based On The Vertical Axis Wind Turbines

As the span of modern bridges increases,the height of the bridge towers also increased,which leads to the increase of its sensitivity of the wind load and we have to control their vibration.The numerical simulation of the flow field of bridge tower with wind turbines was completed by using FLUENT,then we studied the aerodynamic performance under different working conditions to analyze the influence to the aerodynamic performance caused by wind turbines and give out the green building concept of wind energy integration.In order to verify the accuracy of the large eddy simulation,the aerodynamic parameters on the surface of the square column model and the characteristics of the surrounding flow field are simulated in this paper.The results of previous experiments and simulations are compared to prove the reliability and accuracy of the large eddy simulation method.The chamfering of the square column model was carried out to simulate the aerodynamic characteristics of the actual bridge tower model and verif y the relevant irrelevance,and a more reasonable grid scheme was determined to laid the foundation for the subsequent simulation work.The change of aerodynamic performance under static state by adding wind turbines on the corner of the bridge tower model was studied.The installation position of the wind turbines has a great influence on the aerodynamic characteristics,with the increase of the distance between the wind turbine and bridge tower,mean value of drag coefficient and root mean square value of lift coefficient increase first and then decrease.While the shortest distance from the edge of the wind turbine to the tower column h=1/8d,the aerodynamic optimization effect achieved best result.Size of the wind turbines also has effect on it.With the increase of the diameter of wind turbines,the parameters were always behaving decreasing trend,but the change range decreased.By comparing the aerodynamic characteristics of the bridge tower,we found that after the wind turbines were added,the lift and drag force of the structure were significantly reduced.The mean value of the structure surface drag coefficient has reduced 19.8%,and the root mean square value of the lift coefficient has reduced 80.5%,which proved that the additional wind turbines has great controlling effect on the flow field.To study the power generation efficiency of the wind turbines,the wind energy utilization coefficient of the wind turbine under different blade speed ratio and different wind direction angles was simulated,and obtained the torque coefficient curve,output power curve and wind energy utilization coefficient curve.Combined with the wind resource data of Guangdong Province in recent years,an assessment of the actual power generation capacity was conducted,the total annual power generation can reach about 30 MW·h.It proves that the method gives out new ideas for green buildings that can not only improve the structures aerodynamic performance,but also provide energy to the bridge.