Abstract
A numerical model has been presented to analyze unsteady thermal boundary layers with exothermic reaction in spark ignition engine combustion chambers. The numerical technique features an additional computational grid system in the cells adjacent to the wall which allows us to perform the computations in a practical length of time with boundary layer resolution. The combustion model employs a three-zone concept for a temperature field in each cell and has a two-stage process. The model describes not only the combined turbulence-reaction-controlled combustion in the near-wall region, but also the turbulence-controlled-combustion in the core region. The present model reproduces the experimental evidence that local wall heat flux peaks intensify as the wall temperature increases, while the law of the wall does not describe this fact.
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