What is flame front in engine combustion?

(1) The process of ignition of the air-fuel mixture in a flame-front precombustion engine. The lean air-fuel mixture in the main combustion chamber is ignited by a flame of burning gases issuing from a small precombustion chamber filled with a rich air-fuel mixture, which is ignited by a spark plug.

What is combustion process in IC engine?

Spark ignition gasoline and compression ignition diesel engines differ in how they supply and ignite the fuel. In a spark ignition engine, the fuel is mixed with air and then inducted into the cylinder during the intake process. After the piston compresses the fuel-air mixture, the spark ignites it, causing combustion.

How does the flame front propagate discuss the factor that affects flame speed?

Flame speed is high in the turbulent mixture than the non-turbulent mixture. Turbulence cause better intermingling of burned and unburned mixture particle at the flame front. This increases the rate of contact, heat transfer rate, and accelerate the chemical reaction, which increases flame speed.

Is a flame combustion?

Fire is the visible effect of the process of combustion – a special type of chemical reaction. It occurs between oxygen in the air and some sort of fuel. Combustion that results in a flame is very fast and is called burning. Combustion can only occur between gases.

How does the flame spread in a combustion engine?

The combustion spreads from around the spark plug and spreads rapidly across the combustible mixture inside the chamber. The flame speed would depend on the temperature of the flame front and to some extent on the temperature and density of the air fuel mixture.

How does the engine pressure vary in an IC engine?

There is variation of pressure in every cycle of IC engine and it majorly depends upon the combustion process taking place. This combustion is governed by the local composition of the fuel air mixture, the percentage of residual gas present and mixing between this residual gas and fresh charge in the vicinity of spark plug.

What is flame front detonation?

Flame Front Detonation is defined as combustion in which a supersonic shock wave is propagated through a fluid due to an energy release in a reaction zone. From: Materials for Energy Efficiency and Thermal Comfort in Buildings, 2010

What is the difference between SI engine and IC engine?

The first basic difference is the fact that in SI engine, spark initiates the combustion while in CI engine initiation of combustion is solely dependent on self ignition of the fuel being used. There is variation of pressure in every cycle of IC engine and it majorly depends upon the combustion process taking place.