Title: Analysis of the magnetohydrodynamic flow of a fissioning gas in a disk MHD generator
Full Citation
Permanent Link: http://ufdc.ufl.edu/UF00097387/00001
 Material Information
Title: Analysis of the magnetohydrodynamic flow of a fissioning gas in a disk MHD generator
Physical Description: xix, 307 leaves : ill. ; 29 cm.
Language: English
Creator: Welch, Gerard Edward, 1960- ( Dissertant )
Dugan, Edward T. ( Thesis advisor )
Lear, William E. ( Thesis advisor )
Vernetson, William G. ( Reviewer )
Jacobs, Alan M. ( Reviewer )
Oliver, Calvin C. ( Reviewer )
Hanrahan, Robert ( Reviewer )
Publisher: University of Florida
Place of Publication: Gainesville, Fla.
Publication Date: 1992
Copyright Date: 1992
Subjects / Keywords: Magnetohydrodynamics   ( lcsh )
Plasma (Ionized gases)   ( lcsh )
Nuclear Engineering Sciences thesis Ph. D
Dissertations, Academic -- Nuclear Engineering Sciences -- UF
Genre: bibliography   ( marcgt )
non-fiction   ( marcgt )
theses   ( marcgt )
Abstract: The influence of fissioning and magnetohydrodynamic (MHD) interaction on the steady, supersonic flow of a compressible, turbulent, weakly ionized, fissioning gas in an outflow disk MHD generator is investigated in this work. The two-dimensional (r,z) MHD flow is modeled using the thin-layer Navier-Stokes equations with MHD and fission power density source terms, and Maxwell's equations under the MHD Approximations and assuming negligible induced magnetic induction. Simple plasma physics transport property models are developed for the collision-dominated, weakly ionized plasma in which fission fragment induced ionization provides the dominant source of conduction electrons. The simple plasma physics models used in this work suggest that the the electron number densities {O lO^'/m') and corresponding electrical conductivity levels (O 1 S/m) obtained from fission-fragment induced ionization alone may be insufficient for practical MHD generator operation. The MHD flow equations with the fission power density source term, are integrated in boundary-fitted coordinates using the explicit method of MacCormack. The equations of electromagnetics, with variable plasma physics transport properties, are solved using an Altemating-Direction-Implicit (ADI) scheme. A consistent 2-D MHD solution is obtained by iteration between the fluid solver and the electromagnetics solver. The 2-D MHD solution methodology is used to analyze the influence of duct geometry and fission power density (for neutron flux levels between and 10'^ n/cmh) on the behavior of internal supersonic flows (with total Mach numbers less than 3), and to characterize the effects of variable applied magnetic induction levels and generator load resistances on the spatial profiles of important generator variables. The predictions of the 2-D MHD solver developed in this work are compared with those of a quasi-one-dimensional Euler solver with MHD and fission source terms; the agreement between the two approaches suggests that the quasi-one-dimensional Euler solver does an excellent job predicting the behavior of supersonic, fissioning, disk MHD flows. Two-dimensional Hall effect-induced electrode effects are studied. Shortcircuit current loops are found to exist over the majority of the electrode area. The generator load current flows through a small fraction (< 10%) of the electrode surface, resulting in order-of-magnitude higher localized Joule heating levels which give rise to oblique wave structure.
Thesis: Thesis (Ph. D.)--University of Florida, 1992.
Bibliography: Includes bibliographical references (leaves 300-306).
Additional Physical Form: Also available on World Wide Web
General Note: Typescript.
General Note: Vita.
Statement of Responsibility: by Gerard Edward Welch.
 Record Information
Bibliographic ID: UF00097387
Volume ID: VID00001
Source Institution: University of Florida
Holding Location: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: alephbibnum - 001753128
oclc - 26581628
notis - AJG6091


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