Double-duct liquid metal magnetohydrodynamic engine

Details Double-duct liquid metal magnetohydrodynamic engine Double-duct liquid metal magnetohydrodynamic engine

1994-05-05

1997-06-10

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Conducting fluid

H02K 4418

Patent

active

056379358

ABSTRACT:
An internal combustion, liquid metal (LM) magnetohydrodynamic (MHD) engine and an alternating current (AC) magnetohydrodynamic generator, are used in combination to provide useful AC electric energy output. The engine design has four pistons and a double duct configuration, with each duct containing sodium potassium liquid metal confined between free pistons located at either end of the duct. The liquid metal is forced to flow back and forth in the duct by the movement of the pistons, which are alternatively driven by an internal combustion process. In the MHD generator, the two LM-MHD ducts pass in close proximity through a Hartmann duct with output transformer. AC power is produced by operating the engine with the liquid metal in the two generator ducts always flowing in counter directions. The amount of liquid metal maintained in the ducts may be varied. This provides a variable stroke length for the pistons. The engine/generator provides variable AC power at variable frequencies that correspond to the power demands of the vehicular propulsion. Also the engine should maintain nearly constant efficiency throughout the range of power usage. Automobiles and trucks could be powered by the invention, with no transmission or power converter devices being required.

REFERENCES:
Sutton, George W. et al. Electrical and Pressure Losses in a Magnetohydrodynamic Channel Due to End Current Loops, Transactions of AIEE, Jan. 1962 pp. 687-695.
Haaland, Carsten M. Electric Power Generation by Steady Flow Liquid Metal MHD Generators IEEE Int'l Conf. on Plasma Science, Jun. 1991 pp. 1-6.
Elliot, David G. Direct Current Liquid-Metal Magnetohydrodynamic Power Generation, AIAA Journal, Apr. 1966, pp. 627-634.

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