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Title: Radio-frequency power-assisted performance improvement of a magnetohydrodynamic power generator

Abstract

We describe a radio-frequency (rf) electromagnetic-field-assisted magnetohydrodynamic power generation experiment, where an inductively coupled rf field (13.56 MHz, 5.2 kW) is continuously supplied to the disk generator. The rf power assists the precise plasma ignition, by which the otherwise irregular plasma behavior was stabilized. The rf heating suppresses the ionization instability in the plasma behavior and homogenizes the nonuniformity of the plasma structures. The power-generating performance is significantly improved with the aid of the rf power under wide seeding conditions: insufficient, optimum, and excessive seed fractions. The increment of the enthalpy extraction ratio of around 2% is significantly greater than the fraction of the net rf power, that is, 0.16%, to the thermal input.

Authors:
; ;  [1]
  1. Department of Energy Sciences, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8502 (Japan)
Publication Date:
OSTI Identifier:
20714143
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 98; Journal Issue: 11; Other Information: DOI: 10.1063/1.2138803; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ELECTROMAGNETIC FIELDS; ENTHALPY; IONIZATION; MAGNETOHYDRODYNAMICS; MHZ RANGE 01-100; PLASMA; PLASMA HEATING; PLASMA INSTABILITY; PLASMA PRODUCTION; POWER GENERATION; RADIOWAVE RADIATION; RF SYSTEMS; THERMODYNAMICS; THERMONUCLEAR IGNITION

Citation Formats

Murakami, Tomoyuki, Okuno, Yoshihiro, and Yamasaki, Hiroyuki. Radio-frequency power-assisted performance improvement of a magnetohydrodynamic power generator. United States: N. p., 2005. Web. doi:10.1063/1.2138803.
Murakami, Tomoyuki, Okuno, Yoshihiro, & Yamasaki, Hiroyuki. Radio-frequency power-assisted performance improvement of a magnetohydrodynamic power generator. United States. doi:10.1063/1.2138803.
Murakami, Tomoyuki, Okuno, Yoshihiro, and Yamasaki, Hiroyuki. Thu . "Radio-frequency power-assisted performance improvement of a magnetohydrodynamic power generator". United States. doi:10.1063/1.2138803.
@article{osti_20714143,
title = {Radio-frequency power-assisted performance improvement of a magnetohydrodynamic power generator},
author = {Murakami, Tomoyuki and Okuno, Yoshihiro and Yamasaki, Hiroyuki},
abstractNote = {We describe a radio-frequency (rf) electromagnetic-field-assisted magnetohydrodynamic power generation experiment, where an inductively coupled rf field (13.56 MHz, 5.2 kW) is continuously supplied to the disk generator. The rf power assists the precise plasma ignition, by which the otherwise irregular plasma behavior was stabilized. The rf heating suppresses the ionization instability in the plasma behavior and homogenizes the nonuniformity of the plasma structures. The power-generating performance is significantly improved with the aid of the rf power under wide seeding conditions: insufficient, optimum, and excessive seed fractions. The increment of the enthalpy extraction ratio of around 2% is significantly greater than the fraction of the net rf power, that is, 0.16%, to the thermal input.},
doi = {10.1063/1.2138803},
journal = {Journal of Applied Physics},
number = 11,
volume = 98,
place = {United States},
year = {Thu Dec 01 00:00:00 EST 2005},
month = {Thu Dec 01 00:00:00 EST 2005}
}