Behavior of magneto-acoustic waves in a nonequilibrium subsonic disk MHD generator

Hidemasa Takana, Yoshihiro Nabara, Yoshihiro Okuno, Hiroyuki Yamasaki

Research output: Contribution to journalArticlepeer-review

Abstract

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 ur - a (ur: 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.

Original languageEnglish
Pages (from-to)20-26
Number of pages7
JournalElectrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi)
Volume142
Issue number4
DOIs
Publication statusPublished - 2003 Jan 1
Externally publishedYes

Keywords

  • Disk generator
  • Linear perturbation method
  • Magneto-acoustic wave
  • Nonequilibrium MHD generator
  • Subsonic quasi-one-dimensional flow

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

Fingerprint Dive into the research topics of 'Behavior of magneto-acoustic waves in a nonequilibrium subsonic disk MHD generator'. Together they form a unique fingerprint.

Cite this