Theoretical analysis on power generation characteristics for co-axial MHD energy conversion device

Ryo Sasaki, Takayasu Fujino, Hidemasa Takana, Hiromichi Kobayashi

Research output: Contribution to journalArticlepeer-review

Abstract

Theoretical solution is derived for power generation efficiency and electrical output power of the co-axial MHD energy conversion device using liquid metal. Although the electrical output power is proportional to the square of Reynolds number, the power generation efficiency is independent of Reynolds number. The energy input to the liquid metal is converted into electrical output power, viscous and Joule dissipation. For obtaining high power generation efficiency, viscous and Joule dissipation should be minimized. The combination of Hartmann number and electrical resistance ratio exists for the maximum power generation efficiency under the condition of the weak MHD interaction rather than that of the maximum electrical output power. The theoretical analysis clearly shows that the maximum power generation efficiency of the co-axial MHD energy conversion device is 1/3 ≈ 33.3% at the highest.

Original languageEnglish
Pages (from-to)642-648
Number of pages7
JournalIEEJ Transactions on Power and Energy
Volume141
Issue number10
DOIs
Publication statusPublished - 2021

Keywords

  • Electrical output power
  • Liquid metal flow
  • MHD interaction
  • Power generation efficiency
  • Theoretical analysis

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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