AERODYNAMIC CAR

PREFACEAERODYNAMICSStudy of forces generated by motion of air or moving body.

CLASSIFICATION OF AERODYNAMICS• External and Internal• Subsonic• Supersonic• Hypersonic

FIELD OF APPLICATION• Aerospace Engineering• Design of automobile• Ships • Civil Engineering• Design of bridges etc.

NARRATION• In the early 1920s engineers began to consider

automobile shape in reducing aerodynamic drag at higher speeds.

• By the 1950s German and British automotive engineers systematically analyze the effects of automotive drag for higher performance vehicles.

• By the late 1960s scientists showed awareness in the significant increase in sound levels emitted by automobiles at high speed.

• Soon highway engineers began to design roadways to consider the speed effects of aerodynamic drag produced sound levels.

FEATURES OF AERODYNAMICS VEHICLES

• Integrate the wheel arcs and lights into the shape to reduce drag.

• Streamlined.• Consist of a flat and smooth floor to support the

venturi effect.• Produce desirable downwards aerodynamic

forces.• Have a seal between the low pressure region

around wheels and high pressure around the gear box.

• Have closed engine bay floor.

COMPARISION WITH AIRCRAFT AERODYNAMIC

• Road vehicle shape is much less streamlined compare to an aircraft.

• The vehicle operates very close to ground rather than in free air.

• The operating speeds are lower.• A ground vehicle has fewer degrees of freedom

than an aircraft.• Ground vehicles is less affected by aerodynamic

forces.• Ground vehicle have very specific design

constraint.

METHODS OF STUDYING AERODYNAMICS

• Studied using both computer modeling and wind tunnel testing.

• Example of such a rolling road wind tunnel is wind shear’s Full scale, Rolling Road, Automotive wind tunnel in Concord, North Carolina.

DRAG COEFFICIENT

• Common measure in automotive design.• It impacts the way the automobile passes

through the surrounding air.• Reducing the drag coefficient in an automobile

improves the performance of the vehicle.

DOWN FORCE

It describes the downward pressure created by the aerodynamic characteristic of a car:

• It allows to travel faster through a corner.• Very important to produce a good downward

aerodynamic force as effects the car’s speeds and traction.

AERODYNAMIC DEVICES

• Scoops.• NACA ducts.• Spoilers.• Wings.

AERODYNAMIC DESIGN TIPS

• Cover open wheels.• Minimize frontal areas.• Use Spoilers.• Use wings.• Use fronts air dams.• Use aerodynamics to assist car operations.

IMPROVEMENT OF VEHICLE’S AERODYNAMICS

• Lower the car.• Clean up the under side of the car.• Fair the wheel wells.• Remove the side view mirrors and instead use

a remote camera system.• A small “Tail cone” Can be affixed near the

bumper to help transition the air from under the car.

AERODYNAMICS FACTS

• Aerodynamics elements in the cars are tested in wind tunnels.

• The manhole covers on the streets have to be welded down because the down force of the cars can lift manhole covers.

• The front wing is the key to the aerodynamic concept of the F1 car.

• Fuel economy is the focus of the Aerodynamics.

OBJECTIVE OF AERODYNAMICS IN CARS

• Influencing the way a car cuts through air.• Reducing the drag.• Reducing wind noise.• Prevent Undesired lift forces at high speeds.• Produces desirable downwards aerodynamics

forces to improve traction.

• Prakash Jha• Sayan Chatterjee• Dhiman Das• Sounak Kumar Maity• Arnab Sil• Subham Roy• Supriyo Chatterjee

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