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Filtering by: Creator Coblentz, Kyle E. Remove constraint Creator: Coblentz, Kyle E. Degree Field Mechanical Engineering Remove constraint Degree Field: Mechanical Engineering Resource Type Dissertation Remove constraint Resource Type: Dissertation

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  • Generalized Preconditioning to Accelerate Simulations with Large Multiphase Chemical Kinetics Models

    Creator:
    Walker, Anthony S.
    Abstract:
    Combustion emissions produced from burning real transportation fuels have many environmental impacts. However, detailed chemistry across multiple phases, time scales, and thermodynamic conditions make predicting combustion emissions challenging. Detailed modeling of the gas phase alone is prohibitively expensive, due to the large size and stiffness of the kinetic models. The...
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    Dissertation
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    Models Abstract approved: Kyle E. Niemeyer Combustion emissions produced from burning real

  • Assessing Mass Diffusion Modeling in Premixed Flames

    Creator:
    Fillo, Aaron J.
    Abstract:
    Implementing multicomponent diffusion in numerical combustion studies is computationally expensive due to the challenges involved in computing diffusion coefficients. As a result, mixture-averaged diffusion treatments or simpler methods are used to avoid these costs. However, the accuracy and appropriateness of the mixture-averaged diffusion model has not been verified for three-dimensional...
    Resource Type:
    Dissertation
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    : Assessing Mass Diffusion Modeling in Premixed Flames Abstract approved: Kyle E. Niemeyer Implementing

  • Computational Modeling of Smoldering Combustion in Wildland Fuels

    Creator:
    Jayasuriya, Waduge Jayani A.
    Abstract:
    Smoldering combustion in wildland fires is a critical phenomenon that needs in-depth study because it can initiate with weaker ignition sources, can persist for long periods, is difficult to suppress, and can transit to flaming combustion. Cellulose, hemicellulose, and lignin are the major organic constituents within biomass, in varying proportions...
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    Dissertation
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    approved: Kyle E. Niemeyer Smoldering combustion in wildland fires is a critical phenomenon that needs in

  • Optimal soaring by a small autonomous glider

    Creator:
    Kyle, Jason A.
    Abstract:
    Extending the flight time of an autonomous unmanned air vehicle by soaring is considered. A suboptimal controller is developed and successful static soaring is demonstrated with a 6 degree of freedom glider model. Altitude gain rates of between ¼ and ½ m/s are achieved with this simple implementation. A hybrid...
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    Dissertation
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    ABSTRACT OF THE DISSERTATION OF Jason A. Kyle for the degree of Doctor of Philosophy in Mechanical

  • Rational Fuel Design for Low Temperature Internal Combustion Engines

    Creator:
    Daly, Shane R.
    Abstract:
    This work introduces a new methodology to design transportation fuels offering improved efficiency and reduced emissions, aimed to complement both traditional and emerging engine technologies. Many of these emerging technologies are centered around exploiting low temperature combustion (LTC) strategies that offer improved efficiency and reduced emissions. However, a standardized fuel...
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    Dissertation
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    like to acknowledge Dr. Kyle Niemeyer for the technical support he provided, especially regarding

  • Experimental Study of the Impact of Physical and Chemical Properties on Smoldering Combustion in Natural Fuels

    Creator:
    Smucker, Benjamin
    Abstract:
    Smoldering combustion in wildland fires is difficult to extinguish, can transition to flaming combustion, and produces a significant amount of pollutants. It is necessary to understand parameters controlling smoldering in order to help predict the smoldering behavior and potentially mitigate these hazards. The wide variety of natural fuels that occur...
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    Dissertation
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    years. Thank you to Tejas Mulky, Dr. Jayani Jayasuriya, and Dr. Kyle Niemeyer, our collaborators here

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

    Creator:
    Teope, Kaz I.
    Abstract:
    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...
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    Dissertation
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    and researcher. I am also grateful to Dr. Brian Fronk, Dr. Guillaume Mignot, Dr. Kyle Niemeyer, Dr

  • Ignition of Fuel Beds by Firebrands

    Creator:
    Bean, Derek R.
    Abstract:
    The severity of wildfires around the globe is increasing. At the same time, urban development is expanding outward into areas where severe fires occur. There is an increased risk of home loss to fires in areas where severe fires and urban expansion meet. Ignition of homes or nearby fuel is...
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    Dissertation
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    : RH, U, TI, T, wind di- rection Firebrand: T, E, size, composition Pyrolysis Gases Pyrolysis Front

  • Analysis of the Effects of Combustion Products on Forced Ignition and Turbulent Flame Propagation

    Creator:
    Bonebrake, Jonathan M.
    Abstract:
    Practical combustion devices frequently rely upon forced ignition of turbulent fuel/oxidizer mixtures that also contain the product species of combustion. Examples of this include engines that use exhaust gas recirculation (EGR), inter-turbine burners in aircraft engines, and other systems the utilize staged combustion. In this work, the effects of major...
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    Dissertation
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    E is used to refer to a calculated estimate for the minimum ignition energy, and the symbol MIE is

  • Analysis and simulation of dual-source heat pumps with three-fluid evaporators

    Creator:
    Lee, Jai-hyo
    Abstract:
    When the ambient temperature drops, air-source heat pumps deliver less heating per unit of power input and usually cannot provide for the heating load. Therefore, dual-source heat pumps can offer an attractive alternative. In the context of this work, a dual-source heat pump operates as an air-source unit under normal...
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    Dissertation
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    cen Centrifugal acceleration cyc Cyclic e Exit F Due to friction f Liquid or film G Due to