Premium
Behavior of magneto‐acoustic waves in a nonequilibrium subsonic disk MHD generator
Author(s) -
Takana Hidemasa,
Nabara Yoshihiro,
Okuno Yoshihiro,
Yamasaki Hiroyuki
Publication year - 2003
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.10108
Subject(s) - physics , magneto , magnetohydrodynamics , dispersion relation , mechanics , magnetohydrodynamic generator , generator (circuit theory) , acoustic wave , flow velocity , dispersion (optics) , flow (mathematics) , acoustics , classical mechanics , plasma , optics , power (physics) , quantum mechanics
The behavior of magneto‐acoustic waves in a nonequilibrium subsonic disk MHD generator was examined. The solution of the sixth‐order dispersion relation obtained by linearizing the set of MHD equations suggested that a magneto‐acoustic wave which propagates at a velocity of u r − a ( u r : radial fluid velocity, a : sound velocity) should be damped in subsonic flow. From time‐dependent quasi‐one‐dimensional simulations, it was verified that the pressure disturbance in the subsonic generator was damped at approximately the same rate as the value predicted by the linear theory. From a simplified analytical model, the mechanism of magneto‐acoustic instability with fully ionized seed was discussed, and the damping criterion for the magneto‐acoustic wave was clarified. © 2003 Wiley Periodicals, Inc. Electr Eng Jpn, 142(4): 20–26, 2003; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.10108