Question

What precautions should be taken to prevent incomplete combustion of fuel?

Accepted Answer

For a complete combustion, no residue of fuel should be left after the combustion process.

Precautions to be taken to prevent incomplete combustion are:-

Proper air-to-fuel ratio: For complete combustion of the fuel each droplet should be surrounded by air that is equal to or greater than the air-fuel ratio.
Proper atomisation of fuel: Fuel should be sprayed in the form of mist so that it can mix with air for proper combustion.
Heat: Heat required for the combustion of different fuels are also different. Petrol or Gasoline needs very less heat to ignite as it vaporises but not diesel fuel. It needs much higher heat than its gasoline counterparts. Proper heat should be provided for complete combustion.
Engine Timing: Engine timing is very crucial for complete combustion as an early spark can lead to a flame travelling into the intake valve, and also it can lead to knocking.
After-burning: Prevent after-burning by introducing multiple spark plugs so that the entire charge ignites simultaneously because there are chances that fuel exits the chamber unburnt. So make sure all the parts in the combustion chamber get equal heat.

What precautions should be taken to prevent incomplete combustion of fuel?

Important Questions on Model Test Paper -1

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