Aerodynamic research on road cars was reviewed in this work under the thread of reducing drag,with the awareness that this may succeed in effectively decreasing the carbon footprint of transportation.First,a selection...Aerodynamic research on road cars was reviewed in this work under the thread of reducing drag,with the awareness that this may succeed in effectively decreasing the carbon footprint of transportation.First,a selection of studies was presented to focus on the most important aerodynamic features of the flow around realistic car body shapes.Then,the discussion was organized around three pillars related to passive flow control,active flow control and active aerodynamics.Both experimental and numerical investigations were included to provide a comprehensive overview.A clear distinction was made between simplified and realistic car models,as well as production vehicles(within the limits of restricted access information).Moreover,a short essay was dedicated to electric vehicles,for which aerodynamics matters,especially at highway speeds.Last,the impact of aerodynamic principles on the design of current and future vehicle fleet was assessed,honestly admitting that recent market trends must be reversed to turn decarbonization goals into reality and damp the effects of global warming.展开更多
为了降低标准阶背式MIRA(Motor Industry Research Association)模型的气动阻力,设计了四种仿生非光滑单元体:仿生树叶菱形凸台、仿生海螺状凸台、仿生贝壳凹槽、仿生鱼尾楔形凸台。采用正交试验法,系统分析了这些单元体的安装位置、安...为了降低标准阶背式MIRA(Motor Industry Research Association)模型的气动阻力,设计了四种仿生非光滑单元体:仿生树叶菱形凸台、仿生海螺状凸台、仿生贝壳凹槽、仿生鱼尾楔形凸台。采用正交试验法,系统分析了这些单元体的安装位置、安装间距、形状、高度和宽度对气动性能的影响。结果表明:影响减阻效果主次因素为非光滑单元体安装位置,安装间距、形状、高度和宽度;最优组合为在车尾安装仿生楔形鱼尾凸台(高度为11 mm,宽度为21 mm,间距为50 mm),其阻力系数(C_(D))为0.2950,相较于原MIRA模型减阻率达到了9.006%。流场分析表明,最优组合非光滑单元体能够增加MIRA模型尾部分离区流场的能量,减小尾涡面积,有效降低气动阻力。展开更多
文摘Aerodynamic research on road cars was reviewed in this work under the thread of reducing drag,with the awareness that this may succeed in effectively decreasing the carbon footprint of transportation.First,a selection of studies was presented to focus on the most important aerodynamic features of the flow around realistic car body shapes.Then,the discussion was organized around three pillars related to passive flow control,active flow control and active aerodynamics.Both experimental and numerical investigations were included to provide a comprehensive overview.A clear distinction was made between simplified and realistic car models,as well as production vehicles(within the limits of restricted access information).Moreover,a short essay was dedicated to electric vehicles,for which aerodynamics matters,especially at highway speeds.Last,the impact of aerodynamic principles on the design of current and future vehicle fleet was assessed,honestly admitting that recent market trends must be reversed to turn decarbonization goals into reality and damp the effects of global warming.
文摘为了降低标准阶背式MIRA(Motor Industry Research Association)模型的气动阻力,设计了四种仿生非光滑单元体:仿生树叶菱形凸台、仿生海螺状凸台、仿生贝壳凹槽、仿生鱼尾楔形凸台。采用正交试验法,系统分析了这些单元体的安装位置、安装间距、形状、高度和宽度对气动性能的影响。结果表明:影响减阻效果主次因素为非光滑单元体安装位置,安装间距、形状、高度和宽度;最优组合为在车尾安装仿生楔形鱼尾凸台(高度为11 mm,宽度为21 mm,间距为50 mm),其阻力系数(C_(D))为0.2950,相较于原MIRA模型减阻率达到了9.006%。流场分析表明,最优组合非光滑单元体能够增加MIRA模型尾部分离区流场的能量,减小尾涡面积,有效降低气动阻力。
