Working Paper Article Version 1 This version is not peer-reviewed

Effect of Fuel Composition and O2 Concentration on Autoignition Characteristics of n-Heptane/Methane Blended Fuels

Version 1 : Received: 14 January 2021 / Approved: 15 January 2021 / Online: 15 January 2021 (11:54:30 CET)

How to cite: Yoon, M.; Choi, G. Effect of Fuel Composition and O2 Concentration on Autoignition Characteristics of n-Heptane/Methane Blended Fuels. Preprints 2021, 2021010284 Yoon, M.; Choi, G. Effect of Fuel Composition and O2 Concentration on Autoignition Characteristics of n-Heptane/Methane Blended Fuels. Preprints 2021, 2021010284

Abstract

This study numerically analyzed the effect of composition and temperature and oxygen concentration changes on the selfignition characteristics of n-heptane/methane blended fuels in order to cope with development of alternative fuels and international environmental regulations. CHEMKIN-PRO is used as the analysis program and the LLNL model is used as the reaction model. The numerical results revealed that on autoignition and ignition delay time were sensitive to changes in fuel composition and oxygen concentration. As the methane ratio increases, OH radicals causing ignition are delayed in generation and the concentration is lowered, thus longer the ignition timing. The oxygen concentration in the mixed fuels are changed to simulate the exhaust gas recirculation and a numerical analysis in then performed. As the oxygen concentration decreases, the ignition delay time longer because the nitrogen gas acts as a thermal load in the combustion chamber.

Subject Areas

ignition delay time; n-heptane; methane; homogeneous change compression ignition; compression ratio; exhaust gas recirculation

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