| Summary: | This article contains the results of mathematical modeling of the self-ignition delay (<i>τ<sub>c sum</sub></i>) of a single droplet for various fuels, and the results of measurement verification (<i>τ<sub>c</sub></i>) of this modeling in diesel engines. The result of modeling the <i>τ<sub>c sum</sub></i> (as a function of the diameter and ambient temperature of the fuel droplet) revealed two physical and two chemical stages that had different values of the weighting factor (<i>WF<sub>i</sub></i>) in relation to the total delay of self-ignition. It was also found that the <i>WF<sub>i</sub></i> values of individual phases of the self-ignition delay differed for different fuels (conventional and alternative), and in the total value of <i>τ<sub>c sum</sub></i>. The measured value of the self-ignition delay (<i>τ<sub>c</sub></i>) was determined in tests using two diesel engines (older—up to EURO II and newer generation—from EURO IV). The percentage difference in the <i>Δτ<sub>c sum</sub></i> value obtained from modeling two fuels with different cetane number values was compared with the percentage difference in the <i>Δτ<sub>c</sub></i> value for the same fuels obtained during the engine measurements. Based on this analysis, it was found that the applied calculation model of the self-ignition delay for a single fuel droplet can be used for a comparative analysis of the suitability of different fuels in the real conditions of the cylinder of a diesel engine. This publication relates to the field of mechanical engineering.
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