aerodynamics (group 7)

8/14/2019 Aerodynamics (Group 7)

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DONE BY :-DONE BY :-Deepak George:08AB197Deepak George:08AB197

Vince Chacko:08AB200Vince Chacko:08AB200Serin Thomas:08AB199Serin Thomas:08AB199

Stalin John:08AB148Stalin John:08AB148

Roshan Chalissery:08AB138Roshan Chalissery:08AB138


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Aerodynamicserodynamics


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Aerodynamics is the study of how air flows around objects.


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When an object produces poor airflow,more energy is required to push it forward.

Aerodynamics: What a Drag!


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Forces of Flight

Four forces of flight

Lift - upwardDrag down &backwardsWeight - downward

Thrust - forward


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AIRCRAFT

Most aircrafts that fly through the sky have wings to keep them aloft. As the wingcut swiftly through the air, they develop a strong upward force called lift. This forcesupports the weight of the aircraft, holding it up in the air. Wings generate more lift

when moving quickly through the airAEROFOIL

A wing is an aerofoil, which means it has a special shape that enables it to fly. Thetopside is curved and the underside is almost flat- so making the topside longerthan the underside. As the wing cuts through the air, it deflects the air. Due to thewings shape, the air flowing above the wing moves faster then the air flow below.Because air pressure drops more as air moves faster, the air below the wing has a

greater pressure, pushing up the wing.

Control

An aircraft also needs a tail in order to fly. The vertical fin and horizontal tail plane keep itstable.to control the air craft height and course

Aerodynamics: What a Drag!Aerodynamics engineers study the way in which air flows around objects. One objective of aerodynamicstudies is the design of shapes that offer the least resistance to the flow of air. Air offers a resistance to anyobject moving through it. Air resistance is influenced by the shape of an object.

If a moving object is streamlined, the air will flow around it smoothly and cause less drag,


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AUDI R8AUDI R8


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Why Does it Matter?Why Does it Matter?

l At high speedaerodynamic effectsplay an enormousrole in car

performance.l By taking advantage of

the effects of liftracecars have beenable increase theircorning ability, whichin turn decreases laptime.

l Also by minimizing drag

they can maximizethe to s eed of the

Source: Race Car Aerodynamics, J.Katz, 1995


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Model Testing in a WindModel Testing in a Wind

TunnelTunnell We used a 1/12 scale

model of a NASCAR,because full-scaleprototype testing ismore expensive andtime consuming

l By running the modelin wind tunnel atdifferent velocitieswe are able to model

different actual carvelocities, gatheringrelevant informationconcerningaerodynamics.

Source: Union College


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Racecar ProgressionRacecar Progression

l Reduction inaerodynamic drag bystreamlining the

shape of the vehiclel Increase the down force,

negative lift, toincrease cornering

speedsl Raw hp vs. streamlining


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Spoiler EffectSpoiler Effect

lThe addition of aspoiler on the carresults in greater

downward force (ornegative lift) whichresults in bettercornering

lThe addition of aspoiler alsoincreases theamount of drag on

the car

Source: Images.google.com


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Why Drivers DraftWhy Drivers Draft

lBehind the car isa lowpressure/low

velocity pocketwhich aids inthe reduction ofdrag on the

following carlThis increases

efficiency andspeed for both

cars


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DraftingDrafting

Courtesy of trickelfan.com


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What we learnedWhat we learned

lThe strides made in streamlining designsof cars aided in decreasing the dragforce along a vehicle

l

Spoilers create a larger down force on thevehicle which helps in keeping thewheels in solid contact with the groundat high speeds and cornering

lThese concepts together help increasespeeds and lap times which is the overallgoal

aerodynamics (group 7)

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