The air resistance to the motion of a vehicle is something important that engine
ID: 1717651 • Letter: T
Question
The air resistance to the motion of a vehicle is something important that engineers investigate. As you may also know, the drag force acting on a car is determined experimentally by placing the car in a wind tunnel. For a given car, the experimental data is generally represented by a single coefficient that is called the drag coefficient. It is given by the relationship: 6.24 where C drag coefficient Po = measured drag force (lb) = air density (slugs/ft3) = air speed inside the wind tunnel (ft/s) A = frontal area of the car (ft2) 4 frontal area of the car (ft2)Explanation / Answer
Ans
The above statemnet is rightly said, air resistance to the motion of a vehicle is important & defined by
R = KAV^2
where
R is the air resistance In N
K is the cofficient of air resistance & usually its value is taken as 0.03 for average cars
A is the projected are of the vehicle in m^2
V is the velocity of vehicle in km/h
By knowing all these parameters, one can easily calculate the aerodynamic resistance which is posed by air or wind & lowers the speed of the vehicle. Its depends mainly upon speed, shape & wind velocity.
Higher the speed of vehicle more resistance will act on vehicle;
With shape, projected area is defined thats why high speed cars designed in pointed & small size, shape to reduce projected area.
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