Internal Combustion Engines
The output of a diesel engine can be increased without increasing the engine revolution or size in following way

Heating incoming air
Supercharging
Scavenging
Feeding more fuel

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Internal Combustion Engines
Supercharging is the process of

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

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Internal Combustion Engines
The injector nozzle of a compression ignition engine is required to inject fuel at a sufficiently high pressure in order to

All of these
Inject fuel in a chamber of high pressure at the end of compression stroke
Ensure that penetration is not high
Inject fuel at a high velocity to facilitate atomization

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