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8/18/2019 TD001 Gasoline Brake Power
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Objective:
To determine the brake power of IC engine using gasoline in
alternate fuel engine.
Apparatus:
Mega Tech dynamometer/Generator with alternate fuel engine
(Model DG-I)
Technical Data:
Bore size=!mm
"tro#e=$!mm
%om&ression ratio='
"we&t *olume=+,mm
Theory:
Brake Power:
e may define Bra#e .ower as follows
“The power generated by the engine and is measured at output
shaft is known as brake
power”
Mathematically it can 0e e1&ressed as
BrakePower=2πNT
1000
here T re&resents Tor2ue and 3 re&resents num0er
of re*olution4
Indicated Power:
"imilarly indicated &ower can 0e defined on following
terms
“The power generated by combustion of fuel in the engine’s
cylinder is termed as indicated
power”
Mathematically it can 0e e1&ressed as
Indicated Power= PArC
1000
here . stands for &ressure 5 is area of cylinder and c
is num0er of cylinders4 Thedifference 0etween the indicated
&ower and 0ra#e &ower gi*es us mechanical efficiency4
It must 0e mentioned here that 0ra#e &ower is always more
than indicated &ower4
Important Note:
Mechanism is incor&orated in engine assem0ly for maintenance
of o&eration consumesa *alid &art of indicated &ower
&roduced 0y engine inside the cylinder4 6ence 0ra#e
&ower of engine due to friction 0etween the mo*ing &arts
of mechanism is incor&orated4
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The friction 0etween different &arts is mentioned 0elow
Piston Cylinder Walls
Big End Bearing %ran# .inMain Bearing Main 7ournalPiston Pin
%onnecting 8oad
Water Pun 9il .um&Generator 5lternator
Valves :al*e GuidesTappets %am "haft and
;ollower
Analysis o Brake Power:
+$# , '4 !4$,$ >4, !4+$?% !4?'!'
Procedure:'4 Daily ins&ection of a&&aratus carried
out4>4 D4% In&ut crocodile cli&s of a&&aratus
attached to 0attery terminals44
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$4 "witch the starter motor 93 and engine got started4+4
Maintained the throttle at idle s&eed at almost ?,! 8.M4?4 8un
the engine at '!!! 8.M for warming it u&44 8un and tested the
engine at ma1imum s&eed without load4'!4 "hifted the switch
from stat to generator &osition at console &anel4''4 .rods
of @oad 0oard &lugged in the a&&aratus to #now whether
the D% out&ut is
generated or not4'>4 %onfirmed that the #no0 of load 5dAuster
*aria0le at zero &osition4
'4 Turned the load adAuster switched to different &ositions
for num0er of times and
readings of outcome ta#en4
'4 5rranged the data in a ta0le and B4. of engine calculated as
&er gi*en formulae4
$raph
%& %% %' %( )* )& )% )' )( '**
*+)
,
,+)
&
&+)
-
-+)
Tor.ue /0 0peed
#omments:
