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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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