A Novel Dual Fuel Reaction Mechanism for Ignition in Natural Gas–Diesel Combustion

Sebastian Schuh, Jens Frühhaber, Thomas Lauer and Franz Winter
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Sebastian Schuh: Institute of Chemical, Environmental and Bioscience Engineering, TU Wien, Getreidemarkt 9/166, 1060 Vienna, Austria
Jens Frühhaber: Institute for Powertrains and Automotive Technology, TU Wien, Getreidemarkt 9/315, 1060 Vienna, Austria
Thomas Lauer: Institute for Powertrains and Automotive Technology, TU Wien, Getreidemarkt 9/315, 1060 Vienna, Austria
Franz Winter: Institute of Chemical, Environmental and Bioscience Engineering, TU Wien, Getreidemarkt 9/166, 1060 Vienna, Austria

Energies, 2019, vol. 12, issue 22, 1-32

Abstract: In this study, a reaction mechanism is presented that is optimized for the simulation of the dual fuel combustion process using n -heptane and a mixture of methane/propane as surrogate fuels for diesel and natural gas, respectively. By comparing the measured and calculated ignition delay times (IDTs) of different homogeneous methane–propane– n -heptane mixtures, six different n -heptane mechanisms were investigated and evaluated. The selected mechanism was used for computational fluid dynamics (CFD) simulations to calculate the ignition of a diesel spray injected into air and a natural gas–air mixture. The observed deviations between the simulation results and the measurements performed with a rapid compression expansion machine (RCEM) and a combustion vessel motivated the adaptation of the mechanism by adjusting the Arrhenius parameters of individual reactions. For the identification of the reactions suitable for the mechanism adaption, sensitivity and flow analyzes were performed. The adjusted mechanism is able to describe ignition phenomena in the context of natural gas–diesel, i.e., dual fuel combustion.

Keywords: dual fuel combustion; methane–propane– n -heptane mixtures; ignition delay time; reaction kinetics; computational fluid dynamics simulation; rapid compression machine; shock tube; sensitivity analysis; flow analysis (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: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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