Flow analysis of rear end body shape of the vehicle for better aerodynamic performance

Abstract

This paper discusses the aerodynamic flow characteristic of car with various rear shape car body. 80 to 90% of total aerodynamic drag will occurs from base pressure which is created by pressure difference of front and rear side of car. Increasing of pressure difference mainly occurs due to rear end shape of car while it is moving. The proper shape of car, which give less drag and better stability and handling of vehicle by creating streamline flow over the vehicle. For this study, we choose passenger cars with various rear shape such as Hatchback car, Sedan car, Square back car and Fastback car. The experimental work was done in open circuit subsonic wind tunnel with the subscale model 1:10 of all rear shape model at various velocities. The aerodynamic coefficients of drag, lift and pressure (Cd, Cl, and Cp) of car models are plotted to understand the effects of flow condition form the experimental work. The experimental results revels that the sedan car and fast back car are having better aerodynamic performance compare to other car model. And also suggest that researcher will choose better option is hatchback or square back car model for further modification of rear end body to getting better aerodynamic performance.