Numerical modeling of heat release and flame propagation for methane-fueled internal combustion engines with hydrogen addition

Date of Award




Degree Name

Doctor of Philosophy (Ph.D.)


Mechanical Engineering

First Committee Member

Michael R. Swain, Committee Chair


A computer model is developed to analyze the effects of hydrogen addition to methane on ignition delay and combustion duration characteristics of Otto cycle combustion of premixed homogeneous charge mixtures. Pressure and ion gap voltage data taken with pure methane and 20 percent hydrogen-enriched methane are utilized by the model through the assumption of spherical flame growth in order to determine mass fraction burned profiles of recorded cycles. Ion gap voltage data provide information regarding the time of flame arrival at a location away from the firing spark plug, which eliminates heat transfer coefficient form dependence of mass fraction burned profiles. The results indicate that with 20 percent hydrogen enrichment, ignition delay and duration of methane combustion decrease. Besides, lean limits of methane combustion are extended and cycle to cycle variations are reduced noticeably.


Engineering, Automotive

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