Effect of Heat Release Pattern during Flame Propagation on Auto-ignition Process of End-gas

Abstract

The unburned mixture gas near the combustion chamber wall (end-gas) is compressed by the piston and the expansion of burned gas. So the process leading to the auto-ignition of the end-gas is affected by the heat release pattern of the flame during propagation. Though the spark timing is fixed, the heat release of the flame fluctuates. In other words, several heat release patterns are included under the steady state engine operation condition. In this study, how the heat release patterns of the flame affect to the auto-ignition process of the end-gas has been investigated by using zero-dimensional chemical kinetic simulations.