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Experimental and numerical investigation of ignition in a diesel engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published September 12, 1999 by Consiglio Nazionale delle Ricerche in Italy
A comparison between experimental data and results of an integrated numerical model based on the KIVA-3 code is performed with the aim to highlight the fuel ignition process in a high-swirl divided-chamber Diesel system. Spectral extinction and flame intensity measurements from UV to visible are taken in an optically accessible apparatus. Low and high temperature kinetics are numerically simulated by switching from a multiple-steps to a one-step model at a cut-off value of temperature. Kinetics constants are tuned according to the measured data. The influence of spray formation and charge dynamics on the ignition process is fully taken into account. OH radicals are individuated in correspondence of the pressure start of ignition. Their distribution is compared to that of the generic species involved in the model and an explanation of the role played by these last is given.