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Analysis of Linear MHD Power Generators

Abstract

The finite electrode size effects on the performance of an infinitely long MHD power generation duct are calculated by means of conformal mapping. The general conformal transformation is deduced and applied in a graphic way. The analysis includes variations in the segmentation degree, the Hall parameter of the gas and the electrode/insulator length ratio as well as the influence of the external circuitry and loading. A general criterion for a minimum of the generator internal resistance is given. The same criterion gives the conditions for the occurrence of internal current leakage between adjacent electrodes. It is also shown that the highest power output at a prescribed efficiency is always obtained when the current is made to flow between exactly opposed electrodes. Curves are presented showing the power-efficiency relations and other generator properties as depending on the segmentation degree and the Hall parameter in the cases of axial and transverse power extraction. The implications of limiting the current to flow between a finite number of identical electrodes are introduced and combined with the condition for current flow between opposed electrodes. The characteristics of generators with one or a few external loads can then be determined completely and examples are given in  More>>
Authors:
Publication Date:
Feb 15, 1965
Product Type:
Technical Report
Report Number:
AE-175
Resource Relation:
Other Information: 8 refs., 15 figs., 1 tab.
Subject:
30 DIRECT ENERGY CONVERSION; MHD GENERATORS; ELECTRODES; PERFORMANCE; EFFICIENCY
OSTI ID:
20949564
Research Organizations:
AB Atomenergi, Nykoeping (Sweden)
Country of Origin:
Sweden
Language:
English
Other Identifying Numbers:
TRN: SE0708536
Availability:
Commercial reproduction prohibited; OSTI as DE20949564
Submitting Site:
SWDN
Size:
42 pages
Announcement Date:
Dec 15, 2007

Citation Formats

Witalis, E A. Analysis of Linear MHD Power Generators. Sweden: N. p., 1965. Web.
Witalis, E A. Analysis of Linear MHD Power Generators. Sweden.
Witalis, E A. 1965. "Analysis of Linear MHD Power Generators." Sweden.
@misc{etde_20949564,
title = {Analysis of Linear MHD Power Generators}
author = {Witalis, E A}
abstractNote = {The finite electrode size effects on the performance of an infinitely long MHD power generation duct are calculated by means of conformal mapping. The general conformal transformation is deduced and applied in a graphic way. The analysis includes variations in the segmentation degree, the Hall parameter of the gas and the electrode/insulator length ratio as well as the influence of the external circuitry and loading. A general criterion for a minimum of the generator internal resistance is given. The same criterion gives the conditions for the occurrence of internal current leakage between adjacent electrodes. It is also shown that the highest power output at a prescribed efficiency is always obtained when the current is made to flow between exactly opposed electrodes. Curves are presented showing the power-efficiency relations and other generator properties as depending on the segmentation degree and the Hall parameter in the cases of axial and transverse power extraction. The implications of limiting the current to flow between a finite number of identical electrodes are introduced and combined with the condition for current flow between opposed electrodes. The characteristics of generators with one or a few external loads can then be determined completely and examples are given in a table. It is shown that the performance of such generators must not necessarily be inferior to that of segmented generators with many independent loads. However, the problems of channel end losses and off-design loading have not been taken into consideration.}
place = {Sweden}
year = {1965}
month = {Feb}
}