Internal Combustion Engines
Supercharging is the process of

Providing forced cooling air
Injecting excess fuel for raising more loads
Supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere
Supplying compressed air to remove combustion products fully

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Internal Combustion Engines
Scavenging air in diesel engine means

Air used for combustion sent under pressure
Forced air for cooling cylinder
Burnt air containing products of combustion
Air used for forcing burnt gases out of engine's cylinder during the exhaust period

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