タイトル | Bearing development program for a 25 kWe solar-powered organic Rankine-cycle engine |
本文(外部サイト) | http://hdl.handle.net/2060/19860018960 |
著者(英) | Nesmith, B. |
著者所属(英) | Jet Propulsion Lab., California Inst. of Tech. |
発行日 | 1985-09-15 |
言語 | eng |
内容記述 | The bearing development program is summarized for a 25-kWe power conversion subsystem (PCS) consisting of an organic Rankine-cycle engine, and permanent magnetic alternator (PMA) and rectifier to be used in a 100-kWe point-focusing distributed receiver solar power plant. The engine and alternator were hermetically sealed and used toluene as the working fluid. The turbine, alternator, and feed pump (TAP) were mounted on a single shaft operating at speeds up to 60,000 rev/min. Net thermal-to-electric efficiencies in the range of 21 to 23% were demonstrated at the maximum working fluid temperature of 400 C (750 F). A chronological summary of the bearing development program is presented. The primary causes of bearing wear problems were traced to a combination of rotordynamic instability and electrodynamic discharge across the bearing surfaces caused by recirculating currents from the PMA. These problems were resolved by implementing an externally supplied, flooded-bearing lubrication system and by electrically insulating all bearings from the TAP housing. This program resulted in the successful development of a stable, high-speed, toluene-lubricated five-pad tilting-pad journal bearing and Rayleigh step thrust bearing system capable of operating at all inclinations between horizontal and vertical. |
NASA分類 | MECHANICAL ENGINEERING |
レポートNO | 86N28432 NASA-CR-177156 JPL-PUB-85-81 DOE/JPL-1060-92 NAS 1.26:177156 |
権利 | No Copyright |
URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/153752 |
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