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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/17235

Title: The Influence of Elliptical Nozzle Holes on Mixing and Combustion in Direct Injection Natural Gas Engines
Authors: Wager, David
Advisor: Wallace, James S.
Department: Mechanical and Industrial Engineering
Keywords: natural gas
alternative fuel
mechanical engineering
internal combustion engines
Issue Date: 26-Feb-2009
Abstract: Experiments were conducted to compare mixing and combustion of natural gas jets from round and elliptical nozzle holes in an optically accessible combustion bomb. A flame ionization detector was used to measure the concentration fields of the two jet types. Pressure data, combustion imaging, and hydrocarbon measurements of exhaust gas were used to compare the ignition delay, heat release, and combustion efficiency of the two nozzles. Concentration measurements indicated that the elliptical nozzle produced jets with smaller rich core regions and lower peak concentrations at all conditions. Firing tests indicated that the two nozzles produced equivalent ignition delays. Peak heat release rates were higher for the round nozzle, while the elliptical nozzle produced smoother transitions from premixed to diffusion burning. Combustion efficiency was slightly higher for the round nozzle. Results indicate that elliptical nozzles could potentially lower NOx and particulate emissions, but further experiments are required to test this hypothesis.
URI: http://hdl.handle.net/1807/17235
Appears in Collections:Master
Department of Mechanical & Industrial Engineering - Master theses

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