Internal Combustion Engines
Scavenging air in diesel engine means

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

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Internal Combustion Engines
The delay period in compression ignition engines depends upon

Temperature and pressure in the cylinder at the time of injection
Relative velocity between the fuel injection and air turbulence pressure of residual gases
All of these
Nature of the fuel mixture strength

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