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

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Internal Combustion Engines
Detonation is harmful due to

None of these
Excessive turbulence which removes most of the insulating gas boundary layer from the cylinder walls
Increase in the rate of heat transfer, there is a reduction in the power output and efficiency of the engine
High intensity of knock causes crankshaft vibration and the engine runs rough

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