Abstract
A graphite expander, utilizing intermeshing helical rotors and following concepts of Lysholm, was demonstrated for possible use with inert gas cycles. Two demonstration assemblies were tested. Each assembly consisted of a graphite expander and an identical compressor. They were operated in an argon atmosphere where the motor-driven compressor provided pressurized argon to drive the expander. The graphite-on-graphite sliding bearings used were adequate for demonstration but probably not for application. Work is under way on graphite roller and gas bearings. In the first assembly the compressor failed catastrophically because of rotor dragging. The second assembly ran for 274 hr at furnace temperatures between 2350° and 2730°F before voluntary shutdown. Expander inlet temperatures are estimated to have exceeded 2900°F. Speeds to 14,100 rpm in the compressor and efficiencies to 37% in the expander were achieved. Shaft power to the compressor exceeded 10 hp and from the expander approached 1 hp. Pressure ratios in excess of 1.5 were achieved.
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