THERMAL SCIENCE

International Scientific Journal

Habib Bouighi

,

Hamza Bousbaa

,

Younes Menni

,

Mustafa Bayram

,

Omolayo M. Ikumapayi

,

Abiodun Bayode

,

Tin Tin Ting

COMPARATIVE NUMERICAL ANALYSIS OF DIESEL AND BIODIESEL COMBUSTION IN AN INTERNAL COMBUSTION ENGINE

ABSTRACT
This study presents a comprehensive numerical investigation comparing the combustion characteristics and emission behavior of conventional diesel and biodiesel fuel (methyl oleate, C₁₉H₃₈O₂) in a single-cylinder Antor 6LD400 Diesel engine using CONVERGE CFD software. The simulations were carried out under identical operating conditions to evaluate temperature and pressure evolution, heat release profiles, and pollutant formation, including CO, CO₂, NOₓ, soot, and unburned hydrocarbons. Results indicate that biodiesel ignites earlier due to its higher cetane number and oxygenated structure, leading to faster combustion, lower peak in-cylinder pressure and temperature, and reduced emissions of CO, hydrocarbon, and soot. Although biodiesel emits slightly more CO₂, indicative of more complete combustion, it consistently demonstrates lower NOₓ levels due to shorter residence time at high temperatures. These findings confirm that biodiesel offers cleaner combustion with significant emission benefits, making it a promising alternative fuel for reducing the environmental impact of compression ignition engines.
KEYWORDS
biodiesel, methyl oleate, diesel engine, combustion, emissions
PAPER SUBMITTED: 2025-03-02
PAPER REVISED: 2025-04-10
PAPER ACCEPTED: 2025-06-19
PUBLISHED ONLINE: 2025-09-26
DOI REFERENCE: https://doi.org/10.2298/TSCI2504123B
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2025, VOLUME 29, ISSUE Issue 4, PAGES [3123 - 3130]
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PDF VERSION [DOWNLOAD]
Comparative numerical analysis of diesel and biodiesel combustion in an internal combustion engine

2025 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence