This After Burning stage begins where the cylinder pressure reaches a maximum point(c) in the cylinder. But it can not be instantaneous as we claimed to be in the actual cycle. This process takes some time to spread the flame throughout the combustion chamber.ĭuring this stage the pressure rises with very little change in the volume. When the ignition initiated, the adjacent layer of the reaction zone also ignites and propagated to the next layer. This continued throughout the mixture in the combustion chamber. Or simply the spread of the flame throughout the combustion chamber. The flame propagation means that the propagation of combustion wave through a combustible mixture. The ignition lag depends on the heat, pressure, the nature of the fuel and the proportion of the exhaust gas residuals. The chemical delay due to pre-combustion reactions. Physical delay due to the atomisation, vaporization and mixing of air fuel. There are two chances that can cause the ignition delay. It is also referred to as the preparation phase. The time interval between the passage of the spark and the inflammation of the air-fuel mixture is known as ignition lag or Ignition delay. Actual Pressure vs Crank angle diagram Īs you can see the combustion process will be completed in the three stages in an actual engine.
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