Simulation of aerodynamic performance of Savonius wind turbine for highway separation fence based on different overlap ratios
The wind conditions on highways are complex and variable,and its wind field is mainly composed of natural wind and moving vehicles wake,and the velocity presents aperiodicity and perturbation.In order to study the influence law of different overlap ratios on the aerodynamic performance of Savonius(S)vertical axis wind turbine of highway separation fences,the auto-regressive(AR)model of linear filtering and overset grid technology are used to establish a highway time-domain wind field model.Based on above,through hydrodynamic transient numerical simulation,the S wind turbine power aerodynamic efficiency coefficient Cp and moment coefficient Cm are analyzed and discussed when the natural wind speed is five and six,and the overlap ratio is 0～0.24.The results show that,when the aspect ratio and impeller radius of the wind turbine are determined,the wind turbine Cp and Cm improve with increasing overlap ratio for a highway time-domain wind field with a natural wind speed of five.When the natural wind speed reaches six,two peaks of wind turbine Cp and Cm occur at overlap ratios of 0.06 and 0.18,and the overall performance of the S wind turbine is optimal when the overlap ratio is 0.18.
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