FLOW FIELD ANALYSIS OF TRUCKS AND A DESIGN OF AN ADDITIONAL DRAG REDUCTION DEVICE

摘要

Numerical simulation of the outflow field of a truck is carried out by using aerodynamic analysis software based on a computational fluid dynamics model. The velocity and pressure distribution of the outflow field around the truck are obtained and the cause of generating aerodynamic drag is analyzed. The flow separation in the front and at the tail of the truck is the main cause of air resistance generation. Three kinds of truck fairing are proposed based on the aerodynamic drag reduction mechanism. The influence of a drag reduction device on aerodynamic characteristics is analyzed based on the pressure distribution, velocity distribution and turbulent kinetic energy distribution around the truck. The research shows that three kinds of drag reduction devices for a truck have great effect on drag reduction, with the bottom fairing showing the best drag reduction effect. This study provides a theoretical basis for drag reduction and energy saving for the truck.