Graduate Thesis Or Dissertation
 

Identifying the Effects of Combustion Products, Turbulent Fluctuations, and Delivered Energy on Ignition Characteristics of Forced Ignition of Jet-A/air Mixtures

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/wm117w95h

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  • The operation of gas turbine engines depends on the reliable ignition of fuel/air mixtures. Gas turbine engines are commonly used as commercial and military aviation power plants. However, consistent ignition within gas turbine engines is still a problem, especially for more challenging operating conditions such as emergency operations. This work focuses on better understanding the physics of forced ignition, specifically for jet-A/air mixtures, to inform the future development of gas turbine engines and increase the reliability of these engines. Specifically, changes in ignition behavior when combustion products are present, turbulence intensity is increased, and energy deposition exceeds minimum ignition energy (MIE) were investigated. Detailed chemistry calculations were conducted to include one-dimensional simulations of the evolution of H radicals during the combustion of jet-A in air. These calculations were compared to similar calculations of small single-component fuels such as CH₄. A modified Peclet number was proposed for scaling, and it was found that ignition probability data for CH₄ and jet-A mixtures aligned relatively well which is significant because it suggests that a universal scaling to consider ignition behavior is plausible. Measurements of kernel growth rates of jet-A/air mixtures ignited with varied igniter energy sparks demonstrated the impact that entrainment of cooler reactants into the spark kernel has on ignition.
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  • Pending Publication
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  • 2021-09-21 to 2024-01-11

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