Abstract
The purpose of the present study is to improve the aerodynamic performance of a road vehicle by deflectors and splitters. The wind tunnel experiments have been carried out with a moving belt for a 1/5scale car model. As results, deflectors reduced the drag by 32% and splitters reduced the drag by 33%, compared with the normal model without them, and combination of deflectors and splitters reduced the drag by 38%. Furthermore, flow visualization by oilflows showed the factors of drag reduction that airflows avoid direct impingement against the tires by influence of deflectors and splitters
