An Experimental Investigation on Wake of a Car Model Flow by Using Hot-Wire Anemometer in Unsteady Flow

In this study, changes in velocity and turbulence energy in the wake of a Peugeot model and the drag coefficient changes in an Unsteady Flow, with increasing vehicle speed (inlet velocity), are Measured and evaluated. The blow open circuit wind tunnel to simulate fluid flow is used. The maximum disturbances and nominal maximum speed of the device, respectively are, 0. 1% and 30 m / s. The inlet wind velocity has been increased continuously by an inverter that causes the changes in rotational speed of the wind tunnels electro motor. The results showed three different regimes in the velocity profile of the near wake model. With increasing distance from the model and with increasing velocity, three regimes in the wake are close to each other. Turbulence intensity is measured in the wake and drag coefficient decreased with increasing the flow Speed and reached to a minimum value and then increased.