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    Scientific predictability of solid rocket performance: Analyses of the processing parameters.

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    Author
    Perez, Daniel Lizarraga.
    Issue Date
    1992
    Keywords
    Dissertations, Academic.
    Aerospace engineering.
    Solid propellants.
    Advisor
    Ramohalli, Kumar N.
    
    Metadata
    Show full item record
    Publisher
    The University of Arizona.
    Rights
    Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
    Abstract
    The objective of this dissertation is to present a computational model of the suspensions composing uncured composite solid propellant. The work examined highly concentrated suspensions of more than 50% solid volume, with attention to bimodal mixtures. Investigation of propellant processing was conducted to determine how this model can be applied to processing. Experimental work was conducted to supply data for comparison to the computational results. This involved data gathered from an orifice viscometer on viscosity and flow behavior. This model is a tool to investigate goodness of mixing throughout the processing stages of the propellant. The investigation into processing focused both on mixing and casting of the suspension. By studying this model for concentration, velocity and thermal behaviors, a better understanding of how well the propellant composition progresses in processing was obtained. A multiphase mixture approach was taken. This involved a continuum description for the mixture and each constituent. A Fortran program was written to construct this routine. It was run on both a VAXstation 3100, Model 40 using VMS Digital operating system, and a SUN IPX, using SUN UNIX operating system. The code examined two-dimensional monomodal and bimodel mixture flows through a pipe. It examined concentrations between 65% and 75%. Due to the high concentration, it was necessary to apply all inertial and viscous terms within each constituent and the entire mixture. Proper boundary conditions and initial conditions to produce stable runs were found. Both monomodal and bimodal computational results showed good correlations with the experimental data, although a slight dilatation was produced by the program. No dilatation appeared in the experimental work. No concentration drop was detected in either the computational results or experimental work.
    Type
    text
    Dissertation-Reproduction (electronic)
    Degree Name
    Ph.D.
    Degree Level
    doctoral
    Degree Program
    Aerospace and Mechanical Engineering
    Graduate College
    Degree Grantor
    University of Arizona
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    Dissertations

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