![]() ![]() Preflame reaction we discussed above is taking place during the chemical delay. When physical delay completes, the time interval up to the fuel ignites and the flame of the combustion appears is called chemical delay. The period between the time of injection of the fuel and its achievement of self-ignition temperature during vaporization is called physical delay. This delay period can further be divided into two parts – Physical delay and chemical delay. This time interval between the starting of the fuel injection and the beginning of the combustion is called the delay period. ![]() You can see this process at point C on the diagram. This preflame reaction starts slowly and then speeds up until the ignition of the fuel takes place. ![]() During the preflame reaction, pressure into the cylinder starts increasing with the release of energy at a slow rate. You can see this pressure drop (curve AB) in the above figure.Īfter completion of the vaporization process, the preflame reaction of the mixture in the combustion chamber starts. It causes some pressure drop in the cylinder. In this vaporization process, the fuel gets heat from the compressed and hot surrounding air. ![]()
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