BOUNDARY AND END LOSSES IN MAGNETOGASDYNAMIC GENERATORS

One of the major potential loss mechanisms for magnetogasdynamic generators operating at high Hall parameters is that of eddy currents in the entrance and exit regions of the generator. An experiment was designed to test the concept of fluid injection as a means of suppressing the exit current loops...

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Bibliographic Details
Main Authors: Hoffman,Myron A, Hsu,Michael, Oates,Gordon C, Reilly,James P
Format: Report
Language:English
Subjects:
BOUNDARY LAYER
Electric Power Production and Distribution
ELECTRICAL CONDUCTIVITY
HALL EFFECT
INJECTION
LIQUID JETS
MAGNETOHYDRODYNAMIC GENERATORS
MAGNETOHYDRODYNAMICS
QUENCHING(INHIBITION)
SECONDARY FLOW
SPRAYS
STAGNATION POINT
VOLTAGE
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Summary:One of the major potential loss mechanisms for magnetogasdynamic generators operating at high Hall parameters is that of eddy currents in the entrance and exit regions of the generator. An experiment was designed to test the concept of fluid injection as a means of suppressing the exit current loops. Theoretical studies indicate that if sufficiently small droplets on the order of 5 to 30 microns in diameter are introduced into the plasma flow, they would be very effective in quenching the electrical conductivity of the exit region through the mechanism of electron and ion capture. An experiment on a subsonic MGD channel employing axial injection of fine water jets did not result in a rise in open circuit voltage which could be positively attributed to the water injection. It is tentatively concluded that the water jets did not break up into sufficiently small droplets to quench the electrical conductivity in the exit region. (Author)