基于车尾风能回收的气动减阻装置

Aerodynamic drag reduction device based on rear wind energy harvesting

在车尾同时安装隔板和风力发电机(以下简称“复合装置”),利用湍流RANS模型和风力发电机致动线模型对雷诺数Re=1.43×10^(6)工况下全车流场进行了数值计算。首先比较了无车尾隔板、有车尾隔板和复合装置3种情况下车尾流场和车体受力的变化。发现复合装置控制中,隔板提高了车尾背风面压力,减小了车尾斜面上的摩擦力,同时风力发电机在回流区中运转产生推力,这3部分组成复合装置的减阻总效果。其次,讨论了改变隔板长度对复合装置减阻效果的影响,发现隔板和风力发电机的减阻效果均随着隔板长度的增大而先增大后减小,其最大减阻率可达19.5%。

In this study,the plate and wind turbine are coupled on the rear of the vehicle(hereinafter referred to as“the composite device”).Numerical calculation for the flow field around the vehicle at Reynolds number Re=1.43×10^(6) is conducted adopting the Reynolds Average Navier-Stokes(RANS)model and actuator line model.Three cases(that of no control,that with the plate control,and that with the composite control)are compared based on the flow field and aerodynamic force.In the composite control,the total effect of drag reduction can be divided into three parts,in which the pressure on the rear of the vehicle is increased,the friction on the slope decreased,and the thrust generated by the wind turbine.Moreover,the influence of the plate length is discussed based on the effect of drag reduction for the composite device.The results show that both the drag reduction effects of the plate and the wind turbine increase first and then decrease with the increase of the plate length.The attainable maximum drag reduction is 19.5%.