27-03-2012, 01:49 PM
AERODYNAMICS
AERODYNAMICS.ppt (Size: 36 KB / Downloads: 93)
Drag
The forces acting on a solid object in the direction of the relative fluid flow velocity are called drag forces.
Types of drag:
Form drag
Skin friction drag
Induced drag
Skin friction drag
Skin friction arises from the friction of the fluid against the "skin" of the object that is moving through it. Skin friction arises from the interaction between the fluid and the skin of the body, and is directly related to the wetted surface, the area of the surface of the body that is in contact with the fluid.
There are two ways to decrease friction drag: the first is to shape the moving body so that laminar flow is possible, like an airfoil. The second method is to decrease the length and cross-section of the moving object as much as is practicable.
Application of Aerodynamics
Aerodynamics has immense application in automotive industry.
Principles of aerodynamics are used in car designing to reduce drag, reducing undesirable lift forces and reducing aerodynamic instability at high speeds.
Some racing cars are designed to produce desirable downward forces which improves traction and thus cornering abilities.