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Title: Analytical and experimental studies of the helical magnetohydrodynamic thruster design

Abstract

This paper describes the results of analytical and experimental studies of a helical magnetohydrodynamic (MHD) seawater thruster using a 8-Tesla (T) solenoid magnet. The application of this work is in marine vehicle propulsion. Analytical models are developed to predict the performance of the helical MHD thruster in a closed-loop condition. The analytical results are compared with experimental data and good agreement is obtained.

Authors:
;  [1]
  1. Pennsylvania State Univ., State College, PA (United States). Applied Research Lab.
Publication Date:
OSTI Identifier:
404166
Report Number(s):
CONF-940409-
ISBN 1-880653-10-9; TRN: IM9652%%26
Resource Type:
Conference
Resource Relation:
Conference: 4. international conference on offshore and polar engineering, Osaka (Japan), 10-15 Apr 1994; Other Information: PBD: 1994; Related Information: Is Part Of The proceedings of the fourth (1994) international offshore and polar engineering conference. Volume 3; Chung, J.S. [ed.] [Colorado School of Mines, Golden, CO (United States)]; Maeda, Hisaaki [ed.] [Univ. of Tokyo (Japan)]; Naito, Shigeru [ed.] [Osaka Univ. (Japan)]; Ikeda, Yoshiho [ed.] [Univ. of Osaka Prefecture, Osaka (Japan)]; PB: 606 p.
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; 30 DIRECT ENERGY CONVERSION; SHIPS; PROPULSION SYSTEMS; MATHEMATICAL MODELS; CLOSED-CYCLE MHD GENERATORS; THRUSTERS; MAGNETOHYDRODYNAMICS; RESEARCH PROGRAMS; SEAWATER

Citation Formats

Gilbert, J.B. II, and Lin, T.F.. Analytical and experimental studies of the helical magnetohydrodynamic thruster design. United States: N. p., 1994. Web.
Gilbert, J.B. II, & Lin, T.F.. Analytical and experimental studies of the helical magnetohydrodynamic thruster design. United States.
Gilbert, J.B. II, and Lin, T.F.. 1994. "Analytical and experimental studies of the helical magnetohydrodynamic thruster design". United States. doi:.
@article{osti_404166,
title = {Analytical and experimental studies of the helical magnetohydrodynamic thruster design},
author = {Gilbert, J.B. II and Lin, T.F.},
abstractNote = {This paper describes the results of analytical and experimental studies of a helical magnetohydrodynamic (MHD) seawater thruster using a 8-Tesla (T) solenoid magnet. The application of this work is in marine vehicle propulsion. Analytical models are developed to predict the performance of the helical MHD thruster in a closed-loop condition. The analytical results are compared with experimental data and good agreement is obtained.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1994,
month =
}

Conference:
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  • A two Tesla test facility was designed, built, and operated to investigate the performance of magnetohydrodynamic (MHD) seawater thrusters. The results of this investigation are used to validate MHD thruster performance computer models. The facility test loop, its components, and their design are presented in detail. Additionally, the test matrix and its rational are discussed. finally, representative experimental results of the test program are presented, and are compared to pretest computer model predictions. Good agreement between predicted and measured data has served to validate the thruster performance computer models.
  • A two Tesla test facility was designed, built, and operated to investigate the performance of magnetohydrodynamic (MHD) seawater thrusters. The results of this investigation are used to validate MHD thruster performance computer models. The facility test loop, its components, and their design are presented in detail. Additionally, the test matrix and its rational are discussed. finally, representative experimental results of the test program are presented, and are compared to pretest computer model predictions. Good agreement between predicted and measured data has served to validate the thruster performance computer models.
  • Both electron-repelling (negative anode fall) and electron-attracting (positive anode fall) anode sheaths in a Hall thruster were identified experimentally by performing accurate, non-disturbing near-anode measurements with biased and emissive probes. An interesting new phenomenon revealed by the probe measurements is that the anode fall changes from positive to negative upon removal of the dielectric coating, which appears on the anode surface during the course of Hall thruster operation. Probe measurements in a Hall thruster with three different magnetic field configurations show that an anode fall at the clean anode is a function of the radial magnetic field profile inside themore » channel. A positive anode fall formation mechanism suggested in this work is that: (1) when the anode front surface is coated with dielectric, a discharge current closes to the anode at the surfaces that remain conductive, (2) a total thermal electron current toward the conductive area is significantly smaller than the discharge current, therefore an additional electron flux needs to be attracted toward the conductive surfaces by the electronattracting sheath that appears at these surfaces.« less
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  • An experimental program on liquid metal MHD phenomena relevant to blanket engineering is being carried out at ANL's ALEX facility. The experiments carried out at the facility are aimed towards detailed measurements of 3-D MHD flow characteristics to enlarge the existing data base and to provide validation of existing analytical approaches. Results of the first series of experiments, dealing with three dimensional MHD effects in a circular thin conducting wall duct in the fringing field of a strong transverse magnetic field, are reported. Comparison of the experimental data with the predictions of pretest analysis both supports the basic premises onmore » which the analysis is based and suggests possible improvements.« less