Aerodynamics in vehicle
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| Aerodynamics in Vehicle |
Introduction:
The main Function of automotive aerodynamics are reducing drag, reducing wind noise, and preventing undesired lift forces at high speeds. The flow over a vehicle is fully three-dimensional. Boundary layers are turbulent. Flow separation is common and may be followed by reattachment. Large turbulent wakes are formed at the rear and in many cases contain longitudinal
trailing vortices. Aerodynamics in racing cars is also important for speed .
What is Aerodynamics?
When objects move through air, forces are generated by the relative motion between air and surfaces of the body, study of these forces generated by the motion of air is called aerodynamics.
Aerodynamic Forces on Aerofoil -
Considered a aerofoil move through air, forces which are considered for aerodynamic analysis over aerofoil are,
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| Aerofoil |
1.Lift (causes body to rise)
2.Drag (Fluid resistance)
3.Weight
4.Thrust
1.Lift :-
It is the sum of all fluid dynamic forces on a body normal to the direction of external flow around the body. it is caused by Bernoulli’s effect . It results body to rise by creating pressure difference .
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| Aerodynamic lift & Drag in car |
2.Drag:-
It is the sum of all external forces in the direction of fluid flow, so it acts opposite to the direction of the object. it is the force which opposes forward motion of the body through fluid.
3.Weight:-
It is actually just the weight of the object that is in motion. i.e. the mass of the object multiplied by the magnitude of gravitational field.
4.Thrust:-
When a body is in motion a drag force is created which opposes the forward motion of the object so thrust can be the force produce in opposite direction to drag. it must be higher than that of drag so that the body can move through the fluid.
ADVANTAGES OF AERODYNAMICS IN CARS
It is essential that aerodynamics be taken into account during the design of cars as an improved aerodynamics in car would attain
1.More fuel efficiency
2.Higher speeds
3.Good Aesthetic and stylish appearance of car.
4.More stability of car at higher speed
5.Reduces noise level
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Tags:
Automobile Engineering