Atomisation

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Atomisation:

Break up of the liquid fuel into a minute vapour mist.

Factors affecting Atomisation:  

  • small orifices of the injector.
  • pressure difference between fuel line and cylinder.
  • Temperature, mass flow rate and viscosity of the fuel.
Effect of too high atomisation - After burning
Very small fuel particles will not have enough kinetic energy to go through the whole combustion space. Fuel droplets gather near the fuel injector due to resistance from the dense compressed air. 
Hence, they will be starved during combustion and after burning will take place.

Effect of too low atomisation - Poor combustion 
Larger fuel droplets will possess more kinetic energy and get deposited on the liner wall. This causes after burning and poor combustion. Carbon deposits will be seen on the liner walls, side of the piston crown and piston rings.

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