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Aerodynamics

Aerodynamics. Designing an aerodynamic car. What does Aerodynamic mean?. The study of the flow of air around and through an object in motion or stationary The shape of an object affects the flow of air Aerodynamic=Cuts through the air Not-Aerodynamic=Resists air. Aerodynamic?.

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Aerodynamics

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  1. Aerodynamics Designing an aerodynamic car

  2. What does Aerodynamic mean? • The study of the flow of air around and through an object in motion or stationary • The shape of an object affects the flow of air • Aerodynamic=Cuts through the air • Not-Aerodynamic=Resists air

  3. Aerodynamic?

  4. Aerodynamic?

  5. Aerodynamic?

  6. Aerodynamic?

  7. Aerodynamic?

  8. Aerodynamic?

  9. What's Similar?

  10. Aerodynamic=Faster • Higher Speeds • Light cargo weights relative to the size of the vehicle • Can something be TOO Aerodynamic?

  11. YES!!!

  12. What’s Similar? Heavy Cargo weight relative to the size of the vehicle

  13. Principles of Aerodynamics • Drag • Frontal Pressure • Rear Vacuum/Flow Detachment • Turbulence • Lift • Drag Coefficient

  14. Drag • The force acting in opposition to the direction of movement • Drag is comprised primarily of two forces, Frontal Pressure and Rear Vacuum (Flow Detachment)

  15. Caused by air attempting to flow around the front of the car • Air molecules hit the car, creating high pressure • The molecules will naturally flow to low pressure areas • Top, bottom and sides of the car

  16. Caused by the "hole" left in the air as the car moves forward • This force pushes towards the car in all directions • The Rear Vacuum creates Turbulence • An aerodynamic car LIMITS turbulence

  17. Cars generate low pressure and drag all over the car’s body • “Boxy” cars generate more downforce and drag • Thus, having a higher Drag Coefficient

  18. Drag Coefficient • A measure of a how aerodynamic a car will be • All cars produce drag • The goal is to limit drag, turbulence and downforce • The shape of a car is largely responsible for how much drag the car has.

  19. Hints • Ideally, the car body should: • Have a small grill, to minimize frontal pressure. • Have minimal ground clearance below the grill, to minimize air flow under the car • Have a steeply raked windshield to avoid pressure build up in front • Have a converging "Tail" to keep the air flow attached • Have a slightly raked underside

  20. What to do now… • Create an “Aerodynamics” folder on your CAD number • Go online, research car body styles • Look for body styles that are aerodynamic • Find 5 pictures of cars that possess good aerodynamic qualities • Save these pictures in your “Aerodynamic” folder

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