Internal Combustion Engines
Scavenging air in diesel engine means

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

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Internal Combustion Engines
In a four stroke cycle diesel engine, the compression

Starts at top dead center and ends at 40° before bottom dead center
Starts at 40° before top dead center and ends at 40° after top dead center
May start and end anywhere
Starts at 40° after bottom dead center and ends at 10° before top dead center

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