After burning represents the third stage of combustion in SI engine up to point D on ( P – θ ) diagram.ĭuring after burning phase, flame velocity reduces to a certain level. Because of the continuous burning of the remaining fuels in the cylinder and reassociation of dissociated gases in the combustion chamber.ĭuring the expansion stroke, the combustion of air and fuel mixture continues after point C. But, it does not represent the completion of the combustion of the mixture. We attained point C in the second stage of the combustion. This stage is one the most important stage in the stages of combustion in SI engine. The rate of heat transfer to the cylinder walls is very low at the beginning of the flame propagation phase. flame propagation phase starts when the pressure in the combustion chamber starts rising at point B and the phase ends when the highest pressure is achieved in the cylinder at point C on ( P – θ ) diagram.Ĭurve BC on the diagram represents the rate of pressure rise. But you can distinguish between these two phases by observing ( P – θ ) diagram given above. Preparation phase and flame propagation phase is quite a difficult task. Differentiating between the first and second phase i.e.
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