Drag coefficient in Automobiles

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Presentation transcript:

Drag coefficient in Automobiles

Drag Force and Drag Coefficients

Drag Coefficient It is a dimensionless quantity Used to quantify the drag or resistance of an object in a fluid environment such as air or water. Used in the drag equation, where a lower drag coefficient indicates the object will have less aerodynamic or hydrodynamic drag. The drag coefficient is always associated with a particular surface area.

REYNOLDS NUMBER VS Coefficient of drag

Drag coefficient for various items

Drag coefficient of various aircraft

Measured Drag Coefficients

Blunt body and streamlined body

Automobile drag coefficient The drag coefficient is a common measure in automotive designed as it pertains to aerodynamic. The drag coefficient of an automobile impacts the way the automobile passes through the surrounding air. When automobile companies design a new vehicle they take into consideration the automobile drag coefficient in addition to the other performance characteristics. Aerodynamic drag increases with the square of speed; therefore a low value is preferable to a high one. Reducing the drag coefficient in an automobile affects the performance of the vehicle as it pertains to speed and fuel efficiency.

Drag coefficient of various automobiles

Reducing Drag The two main factors that impact drag are the frontal area of the vehicle and the drag coefficient. Lowering the drag coefficient comes from streamlining the exterior body of the vehicle. The most aerodynamic shape is a body Sears- Hack body which is a shape that essentially consists of an elongated tube with pointed ends. Modifications 1) Deletion of certain parts 2) Fabrication

Deletion Roof rack Mud flaps Rear spoiler Side mirrors Radio antenna Windshield wipers

Deletion parts

Deletion parts

Wheel covers Partial grille block Under tray Fender skirts Fabrication Wheel covers Partial grille block Under tray Fender skirts Modified front bumper Kammback

Fabrication parts

Fabrication parts

Boundary layer transmission