Sample PPT Presentation

8/18/2019 Sample PPT Presentation

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SUPERCAVITATION:

SUBMERINE

Seminar by

Siddharth SanghaviExam No:T!"#$%#&

'(ided by

Pro) N R Ane*ar

MIT Co++ege o) Engineering, P(ne

2015-16

-e.artment o) Me/hani/a+ Engineering

1


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Content0

1. Introduction: Objective

2. Literature Survey

3. Concept of Super-cavitation

. !e"i#n $ara%eter"

5. Super-cavity in Sub%arine

6. Ca"e "tudy&. !i"cu""ion

'eference"

2!epart%ent of (ec)anica* +n#ineerin#, (I Co**e#e of +n#ineerin#, $une


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! Introd(/tion

1. ater *i%it" even nature/" "trate#ie", and t)e fa"te"t bird

%ove" tice a" uic*y a" t)e fa"te"t fi").

2. Conc*u"ion to a** t)i" i" t)at "uper"onic underater trave* a" ju"t a drea% for )u%an. e**, t)i" #ive" birt) to )o*e ne

concept ca**ed Super cavity/

!" Ob1e/tive:3. o ac)ieve "uper"onic "peed" underater.. 4et re*ief fro% t)e *i%itation" arrived in t)e entry of projecti*e

into ater.

!! Need:



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" 2iterat(re S(rvey

1. !urin# t)e entry of object" into ater, "evera* f*uid dyna%ic"

p)eno%ena, "uc) a" air and vapor cavitie" and jet for%ation,

occur t)at contribute to t)e bouncin# be)avior of t)e body.

2. o perfor% ater entry te"t", a ater tan i" de"i#ned and

in"ta**ed. Cana* di%en"ion" are "uc) t)at t)e effect of a**" on

t)e f*o fie*d i" "%a**, i.e. a cro"" "ection of 1.2 by 1.2 % and

% in *en#t). *aunc)in# "y"te% provide" different %ode*

ve*ocitie" by variation of t)e #un poder. 7i#. 2.3 depict" a

typica* te"t "et-up, inc*udin# a )i#) "peed ca%era 8up to

36,000fra%e9"

4 !epart%ent of (ec)anica* +n#ineerin#, (I Co**e#e of +n#ineerin#, $une


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$ Con/e.t0

$! Cavitation:

• Cavitation i" t)e proce"" of for%ation of ater bubb*e" )en pre""ure

of ater fa**" be*o it/" vapor pre""ure and t)e "udden co**ap"in# of

t)e"e vapor bubb*e" in t)e re#ion of )i#) pre""ure.

• )en it act" on prope**er", cavitation not on*y cau"e" da%a#e" but a*"

decrea"e" efficiency.

• )en prope**er induce" "i#nificant cavitation it )a" to pu") a#ain"t

co%bination of ater and ater vapour, cau"in# b*ade" to "pin/ ;

run inefficient*y.



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Formation of cavities



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$" S(.er /avitation:

• Cavitation prob*e% beco%e" b*e""in#" )en it co%e" under

condition ca**ed Super cavitation/.

• Super cavitation i" u"e of t)e cavitation effect" to produce a bubb*ein"ide *iuid *ar#e enou#) to enco%pa"" an object trave**in#

t)rou#) t)e *iuid.

• 4reat*y reducin# "in friction dra# on t)e object ; enab*in#

ac)ieve%ent" of very )i#) "peed".

• In Super cavitation t)e "%a** #a" bubb*e" produced due to

cavitation e


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Concept of super cavity.

Nose



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)e ey concept in t)e

de"i#nin# i" t)e no"e of

projecti*e.

=o"e ")ou*d be f*at rat)ert)an "trea%*ined.

)e di%en"ion" ")ou*d be

"uc) t)at it ")ou*d createenou#) cavity to enc*o"e

t)e projecti*e.

3 -e0ign Parameter0



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3! The No0e:

)e no"e i" t)e on*y part )ic) i" in contact it) ater, it i"

"ubjected to e


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>y ac)ievin# "peed up to 1?0%9)r., t)e cavity be#in" to en*ar#e.

Once t)e "upercavity i" produced dra# reduce" 200,000 ti%e",

#ivin# "uper"onic "peed

3" Pro.e++ing the ob1e/t:

)en a "upercavitatin# projecti*e i" enc*o"ed by a cavity

conventiona* propu*"ion tec)niue" cannot be u"ed. rocet en#inei" a "o*ution. " t)e cavity enc*o"e" t)e ve""e* it i" "i%i*ar a" f*yin#

in t)e air. )erefore by u"in# a rocet en#ine )i#) "peed" can be

attained )ic) in turn )e*p" for retainin# t)e cavity.



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)en t)e projecti*e i" fired fro% above ater it pu**" a*on# it) it a

venti*ated cavity )ic) i" un"tab*e but a" "uper-cavitation "tart" t)i"

venti*ated cavity i" converted to vapor cavity. )en t)e rocet %otor i"

fired and u"in# t)e e


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4 S(.er5/avitation in Tor.edo

4! Con/e.t:

o create a bubb*e )ic) ")ou*d inc*ude object in"ide it, t)ere are to

ay":

1 =atura* 8Aapour2 Aenti*ated

In natura* type cavitation t)e cavity i" created by t)e "peed of

projecti*e it) t)e )e*p of no"e. It a*"o ca**ed a" pure cavitation

for%ed on*y by t)e nu%ber of "%a**er cavitie".

In venti*ated type, )oever, #a"e" are re*ea"ed into bubb*e by

"upercavitatin# object.



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)e %ain princip*e be)ind "upercavitation i" >ernou**i/" t)eore%

)ic) i" a" fo**o":

21con"tant

2 P v gh ρ ρ + + =

)u", if potentia* ener#y i" ept con"tant, t)en it) increa"e in dyna%ic

)ead i.e. inetic ener#y, pre""ure "tart" decrea"in# and if t)i" decrea"in#

pre""ure fa**" be*o or up to vapor pre""ure of "urroundin# *iuid, a" a

re"u*t it for%" air bubb*e" and t)i" tri##er" t)e "upercavitation proce"".

4" Prin/i.+e:

It or" on princip*e of ac)ievin# )i#) "peed to create con"iderab*e

pre""ure difference and to pour #a" into it to for% a predictab*e

cavity.



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B-po"ition of t)e "p)erica* no"e %ode*

ver"u" ti%e it) entrance ve*ocity and

entry an#*e 2.15 %9" and 25.15&,

re"pective*y.

rajectory of t)e "p)erica* no"e

%ode* it) entrance ve*ocity an

entry an#*e 63.2 %9" and &.5,

re"pective*y.15

!epart%ent of (ec)anica* +n#ineerin#, (I Co**e#e of +n#ineerin#, $une


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+ntrance an#*e 1&.3 and entrance

ve*ocity 11. %9".

rajectory of t)e conica* no"e

%ode* it) entrance ve*ocity,

31.5 %9".



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6 Ca0e St(dy

Shkvall torpedo



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7 -i00/(0ion

" i" t)e ca"e of %o"t cuttin# ed#e tec)no*o#ie",

"upercavitation i" *ar#e*y concentrated around %i*itary deve*op%ent"

and app*ication". Doever t)i" tec)no*o#y i" "ure to revo*utioni@e

underater eaponry and trave*. Ender ater bu**et" )ave a*ready broen t)e "ound barrier in ater. )e day i" not far aay )en

penci* ")aped, rocet poered ve)ic*e" brea t)e "ound barrier

underater.

18 !epart%ent of (ec)anica* +n#ineerin#,(I Co**e#e of +n#ineerin#,$une


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Re)eren/e0

Re)eren/e Boo*0

1. Co**ier, 4. F. and )o%e, F. '., Convective boi*in# and conden"ation, 3rd ed.,

Oan"a*, $. G., 'upa"in#)e, . S. and Fain, . S., n e%pirica* correction for

"i@in# capi**ary tube", Int.Journa o! R"!r#g"rat#on, 199$, 19 (8), pp.%97 –

&0&.

Pa.er0 )rom Con)eren/e Pro/eeding0. Co*bourne, !. and 'itter, . F., 'uant#tat#v" ass"ss"nt o! !aa"

r"!r#g"rants #n roo a#r *on+#t#on"rs,$roc. of t)e Si


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Re.ort0, 9andboo*0 et/

1. Enited =ation" +nviron%enta* $ro#ra%%e, 'eport of t)e 'efri#eration, ir

Conditionin# and Deat $u%p",ec)nica* Option Co%%ittee, 2002,

""e""%ent - 2002. SD'+ Dandboo: 'efri#eration, 1 8C)apter

Patent

2. $atent no, Country 8in parent)e"i", date of app*ication, tit*e, year.

Internet

3. .8Site 4ive fu** *en#t) E'LJ



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Vi0ion and Mi00ion o) the -e.artment

Vi0ion

o e%poer youn# %ec)anica* profe""iona*" t)rou#) #*oba**y acceptab*e, effective

education ; indu"tria* trainin# it) re*evant re"earc) output.

Mi00ion

o create dyna%ic %ec)anica* profe""iona*" to %eet #*oba* tec)no*o#ica* c)a**en#e" t)rou#)

re"earc) ; innovation for t)e benefit of "ociety.

Vi0ion and Mi00ion o) the In0tit(te

Vi0ion

o e%poer youn# #eneration for "ub"tantia* contribution to econo%ica*, tec)no*o#ica* and

"ocia* deve*op%ent of t)e "ociety.Mi00ion

o be a 4*oba**y, Socia**y con"ciou" in"titute of re"earc) and innovation it) an e


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T9AN ;OU


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