Scavenging

Removal of exhaust gases by blowing fresh air in.

Exhaust gas driven turbochargers are used to supply pressurised fresh air for scavenging and supercharging. In two-stroke diesels, an electrically driven auxiliary blower is usually provided because the exhaust gas driven turbocharger cannot provide enough air at low engine speed, and pressurised air is usually cooled to increase the charge air density.

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