An Experimental Investigation on wake of a car model Flow

Investigation of drag forces on cars has always been one of the major problems engineering. In this study, the drag force on Peugeot 405 model was studied using experimental methods in the wind tunnel. In engineering applications there are various ways for measurement of the forces which exerted on objects in the wind tunnel. In this study, the hot wire anemometer as well as load cells used to study the drag coefficient and the results were compared with each other. In this research velocities of wind tunnel is in the range of 8-58 m/s which equivalent of 10000-25000 Reynolds number. The results show that with increasing velocity drag coefficient at first increases and then decreases. The drag momentum which result from the difference between the front and back of car model momentum is the major drag force and the effect of the Reynolds stresses are low.