Computational fluid dynamics simulation of diesel spray combustion

Authors
Donna, Brian
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Other Contributors
Oehlschlaeger, Matthew A.
Hicken, Jason
Mills, Kristen L.
Issue Date
2015-12
Keywords
Mechanical engineering
Degree
MS
Terms of Use
This electronic version is a licensed copy owned by Rensselaer Polytechnic Institute, Troy, NY. Copyright of original work retained by author.
Full Citation
Abstract
CFD simulations must be validated by comparison to experimental results before being used as part of the design cycle. This thesis presents CFD simulations for a specific spray combustion experimental configuration, Sandia spray A, defined by the Engine Combustion Network and comparison of CFD predictions with experimental results. Two parameter variations are examined within the CFD model. Different fuel injection rate profiles and chemical mechanisms are used to show changes in combustion behavior. Three different fuel injection rate profiles and two chemistry reaction mechanisms are tested, creating six possible simulation cases, with all other parameters held constant (temperature, pressure, O2 concentration, injection duration, and injection mass as well as all other subgrid models, including turbulence and spray physics). The injection rate profiles considered are a constant injection rate, a logarithmic profile for injection rate, and an injection profile with a ramp up to constant injection then a ramp down. The chemical kinetic reaction mechanisms considered are a simplified empirical model that applies generically to a variety of fuels, developed by Gowdadiri and Oehlschlaeger (Gowdadiri & Oehlschlaeger 2014) and a relatively complex mechanism created by Luo et al. (Luo et al. 2014). The simulation outputs examined and compared to experiment are the spray liquid length, vapor penetration, chamber pressure profile and ignition delay (timing of chamber pressure rise due to the onset of combustion). Visualization of the simulated temperature field during spray penetration and combustion are also presented.
Description
December 2015
School of Engineering
Department
Dept. of Mechanical, Aerospace, and Nuclear Engineering
Publisher
Rensselaer Polytechnic Institute, Troy, NY
Relationships
Rensselaer Theses and Dissertations Online Collection
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