Experimental Study of Drag Reduction on a Model Car Using an Active Flow Control

Aerodynamic drag is an important factor in vehicle’s fuel consumption. Pressure drag which is the main component of total drag is a result of boundary layer separation from vehicle surface. In this paper, we investigate experimentally, the possibility of separation from the upper surface of model And the effect of base bleeding as an active flow control method on aerodynamic drag reduction of Ahmed body with 35 degree rear slant angle. And the optimum position of blowing on the Slope and vertical surfaces at the end of model was found. Blowing increased static pressure in the wake andreduces the drag.In addition, pressure profile across the surface model, velocity and turbulence intensity in this paper is studied. All testing was performed aerodynamic Hakim Sabzevari University To measure the flow characteristics, the wind tunnel and a hot wire flow meter Made by Saba Frasnjsh is used The results showed that the jet flow in the best position Cause 21% reduction in the drag coefficient.If the jet flowapplied on theUpper positionof inclined surface,not justifiedAnd increases the drag coefficient. All tests are done in an Open circuitblowing wind tunnel with maximum turbulent intensity 1% andmaximum speed of 30 meters per second. Measured velocity components Carried out by hot-wire flow meters.