experimental study of the characteristics of the wake and drag coefficient changes of a car model in unsteady flow

in this study, changes in speed and turbulence intensity in the wake of a peugeot model and the drag coefficient changes with increases vehicle speed in unsteady flow measured and evaluated. the blow open circuit wind tunnel to simulate fluid flow is used. disturbances and nominal maximum speed of the device, respectively is, 30 m / s and 0.01%. has been continuously increasing speed by an inverter causing changes in rotational speed of the electric motor, wind tunnels. the results showed three different regimes in the velocity profile of the wake model and the location near the model with increasing distance from the model and with increasing speed, three regimes in the wake are close to each other. turbulence intensity is measured in the wake and drag coefficient by increasing the flow speed decreased and reached a minimum value and then increases.