The Modeling of Fuel Auto-Ignition Delay and Its Verification Using Diesel Engines Fueled with Oils with Standard or Increased Cetane Numbers

Jerzy Cisek () and Szymon Leśniak
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Jerzy Cisek: Mechanical Department, Cracow University of Technology, 31-864 Cracow, Poland
Szymon Leśniak: Mechanical Department, Cracow University of Technology, 31-864 Cracow, Poland

Energies, 2023, vol. 16, issue 14, 1-22

Abstract: This article contains the results of mathematical modeling of the self-ignition delay ( τ c sum ) of a single droplet for various fuels, and the results of measurement verification ( τ c ) of this modeling in diesel engines. The result of modeling the τ c sum (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 ( WF i ) in relation to the total delay of self-ignition. It was also found that the WF i values of individual phases of the self-ignition delay differed for different fuels (conventional and alternative), and in the total value of τ c sum . The measured value of the self-ignition delay ( τ c ) was determined in tests using two diesel engines (older—up to EURO II and newer generation—from EURO IV). The percentage difference in the Δτ c sum value obtained from modeling two fuels with different cetane number values was compared with the percentage difference in the Δτ c 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.

Keywords: delay of self-ignition; physical modeling of ? c; verification of modeling of ? c; combustion process; diesel engine (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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