Detonation In IC engines

Detonation In IC engines::-

The loud pulsating noise here and within the engine cylinder of an IC engine is known as detonation ( also called ad knocking or pinking). It is caused due to the propagation of a high-speed pressure web created by the auto-ignition of the end portion of unburned fuel. The blow of this pressure wave may be of sufficient strength to break the piston. Does the detonation is harmful to the engine and must be avoided.
The following are certain factor which causes detonation,…

1) the shape of the combustion chamber.
2) the relative piston of the sparking plug in the case of petrol engines.
3) The chemical nature of the fuel.
4) the initial temperature and pressure of the fuel.
5) the rate of combustion of that portion of the fuel which is the first to Ignite. This portion of the fuel in heating compresses the remaining unburnt fuel, producing the condition for auto-ignition to occur.

The detonation in petrol engines can be is or reduces by the addition of a small amount of lead for ethyl fluid to the fuel. This is called doping.

The following are the cheap effects due to detonation.
1) a loud pulsating noise that may be accompanied by a vibration of the engine.
2) increase in the heat loss to the face of the combustion chamber.
3) an increase in carbon deposits.

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