engine testing
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Engine TestingTRANSCRIPT
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Engine Testing
Sohail Liaqat
120422
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5-Engine Power
• Power has being defned as the rate atwhich work is done. The more power a
thing generates, the more work it cando in a given space of time
• There is in act no way o directly
eas!ring "ower -all ty"es o de#ices$dynamometer’ measure torque andthen power is calculated from formulas
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Fan dynamometer
• %t is also an absor"tion ty"e o dynaoeter inthat when dri#en by the engine it absorbs theengine "ower& S!ch dynaoeters are !se!lainly or ro!gh testing and r!nning& The
acc!racy o the an dynaoeter is #ery "oor&
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Transmission Dynamometers
• Transission dynaoeters' also calledtorq!e eters' ostly consist o a set ostrain-ga!ges f(ed on the rotating shat and
the torq!e is eas!red by the ang!lardeoration o the shat which is indicated asstrain o the strain ga!ge& )s!ally' a o!r arbridge is !sed to red!ce the e*ect o
te"erat!re to ini! and the ga!ges arearranged in "airs s!ch that the e*ect o a(ialor trans#erse load on the strain ga!ges isa#oided&
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Indicator diagram
There are any ty"es o engineindicators' b!t the ost s!itableodern ty"e is the electronic indicator'
which consist o the ollowing ain"arts +
• Press!re "ic,-!" transd!cer.
•
Pre-a"liying de#ice• Tie-base recording syste
• /is"lay syste
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Friction Power
The riction "ower o an engine canbe deterined by the ollowingethods +
• illansline ethod or % enginesonly.
• 3otoring test
• /i*erence between %P 6P7
• 3orse test
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Heat Balance
The "erorance o an engine is generallygi#en by heat balance ethod& To obtains!ch heat balance' the engine !st r!n
!nder constant s"ecifc o"erating conditions'i&e' constant load' constant s"eed' and theollowings are to be considered+
• 8eat s!""lied by the !el
• 8eat absorbed to "rod!ce engine "ower• 8eat ta,en away by cooling syste
• 8eat ta,en away by e(ha!st gas
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o"onents o 8eat 6alance in Percent at 9!ll Load
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