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  • Combustion mechanisms in wood fired boilers

    Creator:
    Tuttle, Kenneth Lewis
    Abstract:
    A program of research has been established at Oregon State University to study wood residue combustion using an experimental spreader-stoker combustor. This research was conducted to increase the understanding of combustion occurring in wood fired boilers. Using Douglas Fir screened to 3/8-3/4 inches, two 4x4 factorial experiments were conducted varying...
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    Dissertation
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    conducted to increase the understanding of combustion occurring in wood fired boilers. Using Douglas Fir

  • Experimental investigation of wood combustion and combustion profiles in a cylindrical combustion chamber

    Creator:
    Dadkhah-Nikoo, Abbas
    Abstract:
    This study presents the results of an experimental investigation of wood combustion. Variables chosen for investigation were fuel feed rate, fuel moisture content, fuel particle size, excess air, fraction and temperature of under-fire air. Data recorded during the experiments included the composition and temperature of the combustion products in the...
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    Dissertation
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    combustion profiles in a cylindrical combustion chamber AN ABSTRACT OF THE THESIS OF Abbas Dadkhah-Nikoo

  • Direct-sampling optical techniques for the study of transient combustion events

    Creator:
    Herron, John R.
    Abstract:
    Techniques have been developed for measuring the temperature, stable species concentrations, and atomic radical concentrations during a transient combustion event. They combine the features of direct sampling with two spectroscopic techniques to produce relatively simple diagnostic techniques to obtain time-resolved measurements. In this study, a transient event was provided by...
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    Dissertation
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    transient combustion events AN ABSTRACT OF THE THESIS OF John R. Herron for the degree of Doctor of

  • An experimental investigation of combustion products through a flat, laminar, pre-mixed hydrocarbon-air flame

    Creator:
    Brenchley, David Lee
    Abstract:
    Flat, laminar, premixed hydrocarbon-air flames were stabilized on a porous-plate burner. In addition to temperature profiles, concentration profiles were measured for methane, ethane, ethylene, propane, acetylene, propylene, carbon monoxide, carbon dioxide and oxides of nitrogen. Dead space thickness, luminous flame zone thickness and hydrocarbon disappearance point responses were also monitored....
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    Dissertation
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    decades combustion research has been ex- panding at an accelerated rate. The combined activities of

  • Experimental studies of heat transfer with an array of horizontal tubes immersed in a high-temerature fluidized bed

    Creator:
    Goshayeshi, Ali
    Abstract:
    An experimental study is described in which time-average local heat transfer coefficients were obtained for arrays of horizontal tubes immersed in a hot fluidized bed. Spatial-averaged heat transfer coefficients, computed from local values, are also reported. Refractory particles with surface mean diameters of 2.14 mm and 3.23 mm were fluidized...
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    -bed combustion offers great potential for the utilization of all ranks of coal to meet air standards

  • 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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    properties are highly sensitive to the behavior of smoldering combustion and uncertainties associated with

  • 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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    diagram of the combustion vessel and optical arrangement . . . . . . . . . 77 5.3 Select timings of false

  • Heat transfer studies in fine particle fluidized beds

    Creator:
    Turton, Richard
    Abstract:
    Two new experimental techniques are presented which enable the direct measurement of heat transfer coefficients in fine particle gas fluidized beds. The first technique uses fine electrically heated Alumel wires to probe fluidized beds of fine particles. The wires varied in diameter from 50.8 to 813μm while the bed material...
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    Dissertation
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    ABSTRACT OF THE THESIS OF Richard Turton for the degree of Doctor of Philosophy in Chemical Engineering

  • 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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    . Title: Analysis of the Effects of Combustion Products on Forced Ignition and Turbulent Flame

  • 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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    . Title: Experimental Study of the Impact of Physical and Chemical Properties on Smoldering Combustion in