EXPERIMENTAL PASSIVE FLOW CONTROL ON AHMED MODEL FOR AERODYNAMIC DRAG REDUCTION

Abstract

This study presents an investigation on the effects of yaw and slant angles to the aerodynamic behavior of the Ahmed model. Experiments were conducted in a low-speed wind tunnel at a constant speed of 25 m/s across different yaw angles. Four Ahmed models with slant back angles of 0°, 15°, 25° and 40° were used. All in all, the experimental results indicate that yaw angle significantly influences the aerodynamic behavior of the Ahmed model. As the yaw angle increases, the pressure distribution also becomes increasingly asymmetric due to changes in flow separation and wake formation. Additionally, the findings also highlight the influence of slant angle variations under yawed conditions, an area with limited prior investigation. The obtained knowledge on the aerodynamic behavior of the Ahmed model from this study is very useful in further vehicle design development that is based on this generic model.