UMD Theses and Dissertations

Permanent URI for this collectionhttp://hdl.handle.net/1903/3

New submissions to the thesis/dissertation collections are added automatically as they are received from the Graduate School. Currently, the Graduate School deposits all theses and dissertations from a given semester after the official graduation date. This means that there may be up to a 4 month delay in the appearance of a given thesis/dissertation in DRUM.

More information is available at Theses and Dissertations at University of Maryland Libraries.

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2008 - 200912010 - 20121

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    Experimental Investigation of Liquid and Gas Fueled Flames Towards the Development of a Burning Rate Emulator (BRE) for Microgravity Applications
    (2012) Bustamante, Michael; Sunderland, Peter B; Quintiere, James G; Fire Protection Engineering; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    Laminar steady burning on flat plates was studied at various orientations with respect to gravity. Flat wicks were saturated with methanol or ethanol. Steady flames were obtained, and ranged from boundary layer flames to plume-type burning. Maximum burning rate per unit area was recorded at an upward inclination of 30º. Mass flux decreased with increasing wick length for all orientations. Dimensionless correlations, using a Rayleigh number and the orientation angle, collapsed most of the data, but not for the horizontal and vertical cases. The measured heat flux correlated with expected averages based on burning rate data; theoretical results were similar but radiation likely affected the wicks results. Gas burner flame stand-off distances when emulating methanol flames were in reasonable agreement, showing similarities in laminar, onset of turbulent flow, and boundary layer separation. 0g ethanol wick flames from drop tower testing and airplane testing are shown.
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    Radiation Transport Measurements in Methanol Pool Fires with Fourier Transform Infrared Spectroscopy
    (2008) Yilmaz, Aykut; Jackson, Gregory S; Mechanical Engineering; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    Pool fires rely on radiation and conduction heat feedback from the combustion process to the liquid surface to vaporize the fuel. This coupled relationship determines the fuel burning rate and thus the fire structure and size. Radiative heat transfer is the dominant heat feedback in large pool fires. Species concentrations and temperatures have large influence on the radiative heat transfer in the fuel rich-core between the flame and the pool surface. To study radiative transport in the fuel-rich core, an experimental method was developed to measure radiative absorption through various pathlengths inside a 30 cm diameter methanol pool fire by using a Fourier Transform Infrared Spectrometer with N2 purged optical probes. The measured spectra are used to estimate species concentration profiles of methanol, CO, and CO2 in the fuel rich core by fitting predictions of a spectrally resolved radiation transport model to the measured spectra. Results show the importance of reliable temperature measurements for fitting the data and the need for further measurements to further understand the structure of fuel rich cores in pool fires.