Explain the term “Streamlining”. State its effect on vehicle with suitable example.

Explain the term “Streamlining”. State its effect on vehicle with suitable example.
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1 Answer

Answer :

Streamlining: To reduce the air resistance during running, the body of motor vehicle is so shaped that is streamlined. An arbitrary shape body of vehicle experiences a large air resistance. This leads to loss of power required for propulsion. This implies a need of aerodynamic considerations for designing a body. So the profiling or shaping of the vehicle body to reduce air resistance as vehicle moves forward is called streamlining

Effect of Streamlining: When the vehicle moves along the road, it faces various forces applied by the air, known as aerodynamic forces. The major effects of these aerodynamic forces on vehicle performance are: Aerodynamic Drag (Induced drag, Profile drag, Friction drag) and Aerodynamic Lift. 

Coefficient of Drag(CD): For a body moving through air of density (ρ) and at uniform velocity (V), the mathematical expressions for drag are; 

image

Where,

A = Projected Frontal Area (mm2)

V = Uniform Velocity (km/hr)

ρ = Air Density (N/mm3)

FD = Drag (N)

CD = Coefficient of Drag

Example:

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