采用尾部隔板降低类客车体阻力的研究

针对类客车体（Ahmed Model）1：1.5模型,采用风洞试验和数值模拟相结合的研究方法,研究了在模型尾部安装多种构型的隔板对气动阻力特性的影响规律。通过分析各种构型隔板对尾流结构和尾部压力分布的影响,初步分析了尾部隔板的减阻机理。研究结果表明：①隔板须根据尾涡结构设计其参数和构型布置,才能达到较理想的减阻效果;②隔板以适当的参数及构型布置时,可以控制尾涡、提高尾部压力、减小压差阻力;③针对该文模型,当隔板宽度为60mm,距尾部后缘10mm,并以3横3纵构型布置时,模型阻力系数降低达15.58%。

Investigation on reducing drag of the bus-like body using tail clapboards

Based on one bus-like body model（Ahmed Model） with a scale of 1∶1.5,the law that different clapboards geometry parameters and disposal type effect on the characteristic of the aerodynamic drag is investigated via the wind tunnel tests and the numerical simulation.By means of analyzing the wake structure and the rear pressure coefficient,the mechanism of the drag-reduction of the clapboards is obtained.The research results indicate that： ①The best drag-reduction impact would be obtained if the clapboards＇ parameters and type are designed based on the wake structure;② When the clapboards are arranged with the proper parameters and type,the wake can be controlled,the rear pressure can be improved and the pressure drag decreases;③ When the clapboards are arranged as grids with three clapboards（the clapboard is 60mm wide and 10mm far from the trailing edge） in both cross and longitudinal directions,the drag coefficient of the model is reduced by 15.58%.