Combustion Simulation of Hydrogen-fuelled Diesel Engines using Detailed Chemical Kinetics
Abstract
During the past decade, considerable effort has been made to introduce alternative energy sources for use in conventional diesel and gasoline engines. Many researchers have attempted to use hydrogen as a fuel in the diesel engine due to its ability to reduce pollutant emissions, such as carbon monoxide and unburned hydrocarbons. With the rapid increase in computational capabilities, 3D computational fluid dynamics CFD codes become essential tools for practical design, control and optimization of hydrogen engines. In the present study, detailed chemical kinetic reactions with twenty steps of hydrogen oxidation with additional nitrogen oxidation reactions were coupled with AVL FIRE® code to study combustion processes in a diesel engine using hydrogen as the fuel. Moreover, a spark ignition model built by C++ program was incorporated into the AVL FIRE® software to simulate the hydrogen ignition behavior. The model was validated by the experimental results and employed to examine important parameters that have significant effects on the engine performance. The simulation results show that the variations of peak in-cylinder pressure, heat release rate, gas cylinder temperature, ignition delay, combustion duration, and NO emissions reasonably agree with the experimental findings. The exhaust gas recirculation (EGR) was also employed at different levels in the engine model. It was found that both peak cylinder pressure and gas cylinder temperature decrease as EGR level increases due to dilution effect. The computations are consistent with the hypothesis that gas cylinder temperature decreases with increasing EGR level and that the decrease in gas cylinder temperature results in the reduction in NO emissions. Copyright © 2013 by ASME.
Recommended Citation
H. A. Khairallah and U. O. Koylu, "Combustion Simulation of Hydrogen-fuelled Diesel Engines using Detailed Chemical Kinetics," ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE), vol. 6 A, American Society of Mechanical Engineers, Jan 2013.
The definitive version is available at https://doi.org/10.1115/IMECE2013-65194
Department(s)
Mechanical and Aerospace Engineering
Keywords and Phrases
AVL FIRE®; Detailed chemical kinetics for hydrogen; Emissions; Hydrogen engine and exhaust gas recirculation (EGR); Spark ignition engine
International Standard Book Number (ISBN)
978-079185628-4
Document Type
Article - Conference proceedings
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2024 American Society of Mechanical Engineers, All rights reserved.
Publication Date
01 Jan 2013
