File:Anode sheath contributions in plasma thrusters (IA anodesheathcontr00rigg).pdf

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Anode sheath contributions in plasma thrusters   (Wikidata search (Cirrus search) Wikidata query (SPARQL)  Create new Wikidata item based on this file)
Author
Riggs, John Forrest.
image of artwork listed in title parameter on this page
Title
Anode sheath contributions in plasma thrusters
Publisher
Monterey, California: Naval Postgraduate School;Springfield, Va.: Available from National Technical Information Service
Description
Thesis advisor(s): Oscar Biblarz
"March 1994."
Thesis (Degrees of Aeronautical & Astronautical Engineer and M.S. in Astronautical Engineering) Naval Postgraduate School, March 1994
Includes bibliographical references
Contributions of the anode to Magnetoplasmadynamic (MPD) thruster performance are considered. High energy losses at this electrode, surface erosion, and sheath/ionization effects must be controlled in designs of practical interest. Current constriction or spotting at the anode, evolving into localized surface damage and considerable throat erosion, is shown to be related to the electron temperature's (T sub e) rise above the gas temperature (T sub o) . An elementary one-dimensional description of a collisional sheath which highlights the role of T sub e is presented. Computations to model the one- dimensional sheath are attempted using a set of five coupled first-order, nonlinear differential equations describing the electric field, as well as the species current and number densities. For a large temperature nonequilibrium (i. e., T sub e > > T sub o), the one-dimensional approach fails to give reasonable answers and a multidimensional description is deemed necessary. Thus, anode spotting may be precipitated by the elevation of T sub e among other factors. A review of transpiration cooling as a means of recouping some anode power is included. Active anode cooling via transpiration cooling would result in (1) quenching T sub e, (2) adding 'hot' propellant to exhaust. and (3) reducing the local electron Hall parameter. However significant technical problems remain. Distribution Limitation(s):
Mode of access: World Wide Web
System requirements: Adobe Acrobat Reader
US Navy )USN) author

Subjects: Aeronautical Engineering; Astronautical Engineering
Language en_US
Publication date March 1994
publication_date QS:P577,+1994-03-00T00:00:00Z/10
Current location
IA Collections: navalpostgraduateschoollibrary; fedlink; americana
Accession number
anodesheathcontr00rigg
Notes some content may be lost due to the binding of the book.
Authority file  OCLC: 1039942013
Source
Internet Archive identifier: anodesheathcontr00rigg
https://archive.org/download/anodesheathcontr00rigg/anodesheathcontr00rigg.pdf

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Public domain
This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code. Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See § 313.6(C)(1) of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use.
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