Reducing the drag resistance of automotive cars by diminishing the wake separation zone

The aerodynamics of the car is majorly influenced by a parameter called coefficient of Drag, because of its necessity in determining the aerodynamic performance of vehicle. Drag is a resistant force generated as static pressure resistance and viscous shear resistance and the pull force created due to wake zones behind the trailing edge of a car. This paper aims at providing an innovative solution to reduce the drag resistance of the car, by converting the viscous force into driving force from trailing end, such that the wake separation zone was diminished largely. The wake zones were diminished due to the straightened flow from the trailing end of the car, which in turn avoids the wake separation. The more aerodynamically efficient the car is designed, less the fuel consumption takes place for a constant given speed. The flow linearization reduces the wake turbulence and CFD analysis is carried out to study the flow pattern over the surface of the car for the designed model. Simulation results have shown that the wake zones were diminished, and the flow is straightened at the trailing end of the car, so that the pressure drag resistance was reduced. The assumed car model is similar to supercars, which are trending now due to its low drag and efficient aerodynamic profile. Airflow becomes resistance when it passes over the car and it becomes thrust energy when it is delivered out from the car itself. This concept is applied as innovative idea of this project. Theoretical validation has been made based on momentum equation against the numerical results.