利用导流装置降低大后壁车辆气动阻力的实验研究(Ⅰ)

Experimental study on reducing large Bluff-based vehicles' drag by using guide vances (I)

利用1/16缩比的公共汽车模型及两种类型的导流装置,在一带有可移动地面和边界层吸收装置的Eiffel型风洞中进行了在车辆后端面的上下边和侧边分别安装导流装置时车辆后部尾流区的压强恢复及气动阻力降低的实验。应用边界层分离理论比较详细地分析了安装导流装置的车辆后部尾流区的流动机理,综合分析评价了车辆表面与导流装置间的缝隙在空气引流及车辆气动阻力的降低中的作用,为新型车辆的设计和改造提供有利依据。

Wake control experiments on reducing large Bluff-based vehicles' drag by using guide vanes are performed by using two kinds of guide vanes on a 1/16-scale bus model settled on the moving ground of an opening wind tunnel. The guide vanes are set on the up side, under side and two-side sides of the based end surface of the bus model. The flow mechanics in the wake of the vehicles with guide vanes is analyzed in detail by using the Boundary Layer Separation Theory. The function of the clearance between the guide vanes and vehicle's surfaces in drag reduction is synthetically analyzed . These results provide references to the design and improvement of new type vehicles.