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1 2006

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Influence of burn profile on the precision of 1-d engine cycle simulation

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Mendera K. Z. , Smereka M.

2006

tom Vol. 13, No. 2

305-314

Mass fraction burned and cumulative heat (gross and net) release curves, presenting the integrated heat release, are thought to be the approximations of the heat added to the working medium during engine cycle throughout the combustion process. Three procedures of burn profile determination are described and their specific assumptions are pointed out. These methods were applied to the cylinder pressure traces and suitable burn profiles were computed. The curves of cumulative heat release (R-W, gross and net) versus crank angle, normalized to unity, were entered to 1D Ricardo WAVE code as the user-defined cumulative burn rate profiles. The simulation results were compared and critically evaluated. Pressure traces of consecutive engine cycles and their indicate, indicated mean effective pressures are presented. Burn profiles of consecutive engine cycles, burn profiles adopted for simulation, comparison of measured and computed pressure and temperature traces, P-V diagrams of measured and simulated engine cycles exemplify results of research work.