Internal Combustion Engines
Scavenging air in diesel engine means

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

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Internal Combustion Engines
Supercharging is the process of

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
Providing forced cooling air
Supplying compressed air to remove combustion products fully

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