Date of Award
2022
Document Type
Open Access Dissertation
Degree Name
Doctor of Philosophy in Mechanical Engineering-Engineering Mechanics (PhD)
Administrative Home Department
Department of Mechanical Engineering-Engineering Mechanics
Advisor 1
Jeffrey D. Naber
Committee Member 1
Jaclyn Johnson
Committee Member 2
Thomas Wallner
Committee Member 3
William DeOjeda
Abstract
In this work, the advantages of partially stratified direct injection natural gas versus premixed port-fueled injection natural gas spark ignited engines has been studied. The volumetric efficiency, ratio of specific heats and turbulent kinetic energy was found to be higher with direct injection versus port-fueled injection thus improving thermal efficiency. A background study of optical chamber experimental data was performed to develop an understanding on the effect of pressure ratio on direct injection of methane under both fully-expanded (sub-sonic) and under-expanded (super-sonic) conditions. Under-expanded jets had a noticeable advantage in terms of turbulent kinetic energy, which led to enhanced air entrainment and mixing. An experimental study using a 200bar four hole 1mm diameter injector was performed repeatedly for upstream versus downstream pressure ratios, within the range 1.3 < pressure ratio
Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial 4.0 License
Recommended Citation
Zoldak, Philip S., "PARTIALLY STRATIFIED COMBUSTION OF NATURAL GAS FOR SPARK IGNITION ENGINES", Open Access Dissertation, Michigan Technological University, 2022.
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Computer-Aided Engineering and Design Commons, Energy Systems Commons, Heat Transfer, Combustion Commons