A SEMINAR ON IMPACT OF AERODYNAMICS IN DESIGN Guided By:- Avadhoot Rajurkar Prepared By:- Maulik Shah 05ME77

WHAT IS AERODYNAMICS? Aerodynamics is a branch of dynamics concerned with studying the motion of air, particularly when it interacts with a moving object.

WHAT IS AEROFOIL? Aerofoil is a device that produces reactive forces when in relative motion to the surrounding air. An airfoil, or aerofoil is the shape of a wing or blade (of a propeller, rotor or turbine) or sail as seen in cross-section .

AEROFOIL

AEROFOIL TERMINOLOGY The mean camber line is a line drawn midway between the upper and lower surfaces. The chord line is a straight line connecting the leading and trailing edges of the airfoil, at the ends of the mean camber line. The chord is the length of the chord line and is the characteristic dimension of the airfoil section. The maximum thickness and the location of maximum thickness are expressed as a percentage of the chord.

WHAT IS DRAG? Drag is the aerodynamic force that opposes an aircraft's motion through the air . Drag is a mechanical force. It is generated by the interaction and contact of a solid body with a fluid.

DRAG

AERODYNAMICS IN NATURE Feathers are example of aerodynamic design of nature. The tail of the bird plays a big role during flight. The tail acts as the rudder, balancing and steering the bird. The tail also helps the bird in stopping. The tail is turned downward and acts like a brake. Shape of the wing resembles an aerofoil.

AERODYNAMIC DESIGN Why is it necessary? It is necessary because for example:- At highway speeds, most of the energy needed to move a car down the road goes to pushing air out of its way On the EPA highway cycle with an average speed of 48 mph, 54% of the energy required to move a car goes to aerodynamic drag. Because drag increases with the square of speed, more than twice as much energy would be required to overcome drag at 70 mph.

IMPACT OF GOOD AERODYNAMICS

CAR AERODYNAMICS What do you mean by car Aerodynamics? How will it change car physics? What will be modification required in body of a car?

BICYCLE AERODYNAMICS Hindrance due resistance to wind resistance How to reduce it?

AIRCRAFT AERODYNAMICS Advances made in CFD technologies, coupled with the phenomenal growth in the speed and memory of computers in the last decade, have made it possible to routinely conduct aerodynamic simulations of complete aircraft configurations. The ability to model a complete aircraft at desired flight conditions provides valuable aerodynamic data to enable faster and cheaper design and evaluation cycles

PARTS OF AIRCRAFT

The F/A-18 results shown here were obtained by CFDRC engineers from separate studies for buffet and control analysis and for store loaded aircraft aerodynamic predictions. The simulations shown here were performed by CFDRC engineers to predict the flow field of a generic Rotor Body Interaction (ROBIN) helicopter body with a four-bladed rotor in a hover configuration.

HOVERCRAFT AERODYNAMICS While designing hovercraft one has to keep in mind following aspects:- Dynamic effect and hump drag Aerodynamic drag Lift Thrust Skirts Stability Thrust reversers

REFERENCES:- http://en.wikipedia.org/wiki/Image:Denney.kitfox.g-foxc.asp http://www.grc/nasa.gov/WWW/Wright/airplane/shape.html http://www.grc.nasa.gov/WWW/Wright/airplane/incline.html http://en.wikipedia.org/wiki/Image:PSU-90-125.PNG http://en.wikipedia.org/wiki/Image:Lift_drag_graph.JPG Encarta encyclopedia Britanica encyclopedia