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Direct observation of two phase flow generated by an alumina seeded grain in high aspect ratio channels

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Author
Fahlenkamp, Keith B.
Date
2010-06
Advisor
Brophy, Christopher
Second Reader
Gannon, Anthony
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Abstract
Adding appropriate amounts of aluminum to solid rocket propellant improves energy performance by increasing both the specific impulse and propellant energy density. However, as the propellant combusts, the aluminum is oxidized into alumina (Al2O3) which tends to agglomerate into relatively large molten droplets under the right flow conditions, and may cause significant two-phase flow losses, potentially catastrophic nozzle erosion, and a potentially increased burn rate as a result of erosive burning. Significant research has been conducted regarding agglomerate formation at the propellant surface and agglomerate impact on nozzle erosion, but little is known about agglomerate behavior within high aspect ratio regions of advanced propellant grain designs and how this behavior affects flow through the combustion chamber and impacts erosive burning. An experiment was designed to image agglomerate behavior within these regions. The experimental method was validated using an inert calibration grain containing known alumina particulates. The primary goal of this thesis was to establish a working experimental setup and method that can be used to evaluate agglomerate flow for actual propellant samples.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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http://hdl.handle.net/10945/5319
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  • 1. Thesis and Dissertation Collection, all items

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    An experimental investigation of the behavior of metallized solid propellants. 

    Smith, Michael J. (Monterey, California. Naval Postgraduate School, 1988-12);
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    The effect of aluminum on the emission spectra of solid propellants in the 7.5 to 15.0 micron region. 

    Habicht, Roland Franz. (Monterey, California. Naval Postgraduate School, 1967-06);
    The effect of aluminum in solid propellants on the emission of combustion energy in the 7.5-15.0 micron region of the infrared spectrum was measured. The presence of an "atmospheric window" (8.0-13.0 mi­crons) allows energy ...
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    Holographic investigation of solid propellant combustion 

    Butler, Albert George (Monterey, California. Naval Postgraduate School, 1988-12);
    An investigation into the behavior of aluminized solid propellant combustion in a two-dimensional windowed rocket motor was conducted using holographic techniques. Holograms were recorded in the motor port, aft of the ...
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