8/16/2019 Jelyn Turbo

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CENTRIFUGAL TURBOTurbochargers are centrifugal compressors ri!en b" an e#haust

gas turbine an emplo"e in engines to boost the charge air pressure$Turbocharger performance influences all important engine parameters%

such as fuel econom"% po&er% an emissions$ It is important to

unerstan a number of funamental concepts before mo!ing on to a

more etaile iscussion of turbocharger specifics$

A turbocharger consists of a compressor &heel an e#haust gas

turbine &heel couple together b" a soli shaft an that is use to boost

the inta'e air pressure of an internal combustion engine$ The e#haust gas

turbine e#tracts energ" from the e#haust gas an uses it to ri!e the

compressor an o!ercome friction$ In most automoti!e(t"pe

applications% both the compressor an turbine &heel are of the raial

flo& t"pe$ )ome applications% such as meium( an lo&( spee ieselengines% can use an a#ial flo& turbine &heel instea of a raial flo&

turbine$ The flo& of gases through a t"pical turbocharger &ith raial

flo& compressor an turbine &heels is sho&n in figure$