CAJ | 학술논문

将凹坑型非光滑表面布置在MIRA直背式、斜背式、阶梯背式3种模型的尾部，分析了3种不同车型的尾流结构，研究不同的汽车尾部造型对非光滑车身气动减阻的影响。通过对模型外部流场的数值计算，比较光滑模型和非光滑模型尾部流场、压力、湍动能等参数，对比不同尾部造型非光滑表面流场差异，分析非光滑表面气动减阻的机理，解释不同车尾造型减阻率差异的原因，为进一步研究车身非光滑表面气动减阻效果提供理论依据。
장요갱형비광활표면포치재MIRA직배식、사배식、계제배식3충모형적미부，분석료3충불동차형적미류결구，연구불동적기차미부조형대비광활차신기동감조적영향。통과대모형외부류장적수치계산，비교광활모형화비광활모형미부류장、압력、단동능등삼수，대비불동미부조형비광활표면류장차이，분석비광활표면기동감조적궤리，해석불동차미조형감조솔차이적원인，위진일보연구차신비광활표면기동감조효과제공이론의거。
Pit-type non-smooth surfaces are adopted for the three types of rear end ( squareback, fastback and notchback) of MIRA model and their wake structures are analyzed to study the effects of different rear-end shapes on the aerodynamic drag reduction of non-smooth car body. Through the numerical calculation of external flow field of models, the flow field, pressure, turbulent kinetic energy and other parameters of rear end of both smooth and non-smooth models are compared. The flow field differences of non-smooth surface of different tail shapes are also compared, the mechanism of aerodynamic drag reduction of non-smooth car body is analyzed, and the reasons for the differences in drag reduction rates of different car tail shapes are explained, providing a theoreti-cal basis for the further research on the aerodynamic drag reduction of non-smooth car body.