C.H. Kim, J.H. Ha
Seoul National University of Science & Technology, KR
aerodynamic drag force, CO2, fuel economy, road-load power, rolling resistance force, engine brake power, turbulent kinetic energy, CFD
Aerodynamic design of high-speed coaches have been made to reduce aerodynamic drag for lower fuel consumption and to keep the driving stability of the vehicle on a highway. However, the external body shape of a long-distance, high-speed coach manufactured around the world is in a rectangular shaped blunt body. With this conventional body configuration of the bus, it is not easy to have a minimum aerodynamic drag. In this study, a streamlined design concept was incorporated to the front-side of a long-distance model bus to see its effect on the reduction in aerodynamic pressure drag and a general type of RGV(rear guide vane) was applied to see its effect on the reduction in the induced drag at the rear flow field of the model bus. Computational fluid dynamics(CFD) method was incorporated to analyze the variation of aerodynamic effect on the model buses with the change of body configuration. From the study, it was found that 27.4% of the total drag of the original bus (Model-0) was reduced on the model-3 that is equivalent to 17.3kW of an engine brake power at 120km/h in speed.