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Aerodynamic cars


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BY Prakash Jha - Mechanical Engineer.

Published in: Engineering
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Aerodynamic cars

  1. 1. PREFACE AERODYNAMICS Study 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.
  2. 2. 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.
  3. 3. 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.
  4. 4. 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.
  5. 5. 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.
  6. 6. 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.
  7. 7. 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.
  8. 8. AERODYNAMIC DEVICES • Scoops. • NACA ducts. • Spoilers. • Wings.
  9. 9. AERODYNAMIC DESIGN TIPS • Cover open wheels. • Minimize frontal areas. • Use Spoilers. • Use wings. • Use fronts air dams. • Use aerodynamics to assist car operations.
  10. 10. 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.
  11. 11. 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.
  12. 12. 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.
  13. 13. THANK YOU • Prakash Jha • Sayan Chatterjee • Dhiman Das • Sounak Kumar Maity • Arnab Sil • Subham Roy • Supriyo Chatterjee