aerodynamics.ppt

8/16/2019 aerodynamics.ppt

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BASICAERODYNAMIC

PRINCIPLES


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THE EQUATION OF CONTINUITY

Simply states that “ MASS CAN

NEITHER BE CREATED OR

DESTROYED

The!e"#!e$ ai! mass "l#% is 'sta't(


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A()(

* C#'sta't

) * C#'sta't

A

At spee+s ,el#% (- M +e'sity &a' t# th#./ht t# ,e

i'si/'i"i&a't s#0


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BERNOULLI1S THEOREM

2( P#te'tial e'e!/y +.e t# hei/ht

3( Heat e'e!/y

4( P!ess.!e e'e!/y-( 5i'eti& e'e!/y +. t# m#ti#'(

A /as i' stea+y m#ti#' p#ssesses- types #" e'e!/y0


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BERNOULLI1S THEOREM

States “THE TOTAL ENER6Y OF

AN IDEAL STREAMLINED FLUID

IS CONSTANT

At spee+s ,el#% (- M it &a' ,e

".!the! simpli"ie+ ,y ass.mi'/ '#t!a's"e! #" heat e'e!/y a'+ '#

&ha'/e i' altit.+e(


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F#! p!a&ti&al p.!p#ses$ i' the

st!eamli'e+ "l#% a!#.'+ a %i'/ at l#%

spee+ 0

P!ess.!e 7 5i'eti& * C#'sta't

e'e!/y e'e!/y

p 7 2 )3

* C#'sta't3


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I' %#!+s 8stati& p!ess.!e 7 +y'ami&

p!ess.!e %ill ,e 'sta't(1

The!e"#!e a' i'&!ease i' +y'ami&p!ess.!e %ill !es.lt i' a +e&!ease i'

stati& p!ess.!e(


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AEROFOIL TERMINOLO6Y


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ESSENTIAL

DEFINITIONS


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FREE STREAM FLO9

“ Ai! i' a !e/i#' %he!e p!ess.!e$

tempe!at.!e a'+ !elati:e :el#&ity a!e

.'a""e&te+ ,y the passa/e #" theai!&!a"t th!#./h it( S#metimes &alle+

the RAF ;Relati:e Ai! Fl#%


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TOTAL REACTION ;TR<

“ The !es.lta't #" all the

ae!#+y'ami& "#!&es a&ti'/ #' the

%i'/ #! ae!#"#il se&ti#'


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LIFT

“ That mp#'e't #" the TR %hi&h is

pe!pe'+i&.la! t# the "li/ht path #!

RAF


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DRA6

“ The mp#'e't #" the TR %hi&h ista'/e'tial t# the "li/ht path i( e

pa!allel t# the RAF


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CHORD LINE

“ A st!ai/ht li'e =#i'i'/ the &e't!es

#" &.!:at.!e #" the lea+i'/ a'+

t!aili'/ e+/es #" a' ae!#"#il


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CHORD ;&<

“ The +ista'&e ,et%ee' the lea+i'/

a'+ t!aili'/ e+/e meas.!e+ al#'/ the

&h#!+ li'e(


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CHORD ;&<


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9IN6 AREA ;S<

“ A!ea #" the %i'/ p!#=e&te+ #' a

pla'e pe!pe'+i&.la! t# the '#!mal

a>is


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MEAN LINE OR CAMBER LINE

“ A li'e =#i'i'/ the lea+i'/ a'+

t!aili'/ e+/es #" a' ae!#"#il

e?.i+ista't "!#m the .ppe! a'+l#%e! s.!"a&es(


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AN6LE OF ATTAC5 ;

<

“The a'/le ,et%ee' the &h#!+ li'e

a'+ the "li/ht path #! RAF(

S#metimes !e"e!!e+ t# as i'&i+e'&e(


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;Ri//e!1s< AN6LE OF INCIDENCE

“ The a'/le at %hi&h a' ae!#"#il is

atta&he+ t# the ".sela/e( The a'/le

,et%ee' the mea' &h#!+ li'e a'+ thel#'/it.+i'al ".sela/e +at.m(


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THIC5NESS@CHORD RATIO ;t@&<

“ The ma>im.m thi&'ess #! +epth

#" a' ae!#"#il se&ti#' e>p!esse+ as a

pe!&e'ta/e #" &h#!+ le'/th(


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CENTRE OF PRESSURE ;CP<

“ The p#i't$ .s.ally #' the &h#!+

li'e$ th!#./h %hi&h the TR may ,e

'si+e!e+ t# a&t(


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STREAMLINE

“ The path t!a&e+ ,y a pa!ti&le i' a

stea+y "l.i+ "l#%


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ASPECT RATIO ;AR<

SPAN3 *ASPECT RATIO

AREA

SPAN *ASPECT RATIO

CHORD


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9IN6 LOADIN6

The %ei/ht pe! .'it a!ea #" the

%i'/(

9EI6HT * 9

9IN6 AREA S


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SUMMARY

aerodynamics.ppt

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