13-11-2012, 04:18 PM
AERODYNAMICS
AERODYNAMIC.pptx (Size: 1.25 MB / Downloads: 39)
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 air is called aerodynamics.
HISTORY AND EVOLUTION
Ever since the first car was manufactured in early 20th century the attempt has been to travel at faster speeds.
1950, the levels of aerodynamic drag went up because cars were becoming more family friendly and so as a consequence the shapes available to choose were more limited and so it was not possible to keep the low level of aerodynamic drag.
During the 1970’s there was a fuel crisis and so the demand for more economical cars became greater, which led to changes in car aerodynamics.
STUDY OF AERODYNAMIC FORCES ON CAR
DRAGrag, in vehicle aerodynamics, is comprised primarily of two forces. Frontal pressure and rear vaccum.
DRAG FORCES AT LOW SPEED: The total drag force decreases, meaning that a car with a low drag force will be able to accelerate and travel faster than one with a high drag force. This means a smaller engine is required to drive such a car, which means less consumption of fuel.
CAR WEIGHT: less force is required to move the car. This is based on F=MA or more accurately, A=F/M, so as mass of the car decreases, the acceleration increases, or less force is required to accelerate the lighter car.
DESIGN TIPS
Keep the vehicle low to the ground, with a low nose, and pay attention to
the angle of wind shield.
All body panels should have a minimal gap.
All details such as door handles should be smoothly integrated within the contours.
Minor items such as wheel trims and wing mirrors should be optimized using w