Improvement of Plasma-flow Behavior and Performance of a Disk MHD Generator under High Magnetic Flux Densities

• Liberati Alessandro

  Department of Energy Sciences, Tokyo Institute of Technology

• Okuno Yoshihiro

  Department of Energy Sciences, Tokyo Institute of Technology

Abstract

A two dimensional large eddy simulation has been carried out to study and compare the performance of two disk MHD generators with different wall profiles under high magnetic flux densities. One disk MHD generator has the commonly used straight disk walls and the other has newly proposed contoured disk walls. The numerical results clearly show that the generator with contoured disk walls achieves higher performance than the generator with straight disk walls, because of the improvements in the flow behavior and plasma conditions in the generator channel. For high magnetic flux densities, the flow becomes subsonic in the generator with straight disk walls and its performance tends to saturate with increasing in magnetic flux density. In the generator with contoured disk walls, on the other hand, the supersonic flow is maintained in the entire generator region and its performance increases with increasing in magnetic flux density even under the same working conditions.

Journal

• IEEJ Transactions on Power and Energy

  IEEJ Transactions on Power and Energy 128 (2), 493-498, 2008

  The Institute of Electrical Engineers of Japan

Keywords

• Disk MHD generator
• channel shape
• MHD flow
• non equilibrium plasma
• enthalpy extraction ratio
• isentropic efficiency

Details

• CRID: 1390282679578243968
• NII Article ID: 10021130391
• NII Book ID: AN10136334
• DOI: 10.1541/ieejpes.128.493
• ISSN: 13488147
• ISSN: 03854213
• NDL BIB ID: 9364300
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I9364300
• Web Site: http://www.jstage.jst.go.jp/article/ieejpes/128/2/128_2_493/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed