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学位の種別: 課程博士, 審査委員会委員 : （主査）東京大学教授 田中 栄, 東京大学特任准教授 愛甲 丞, 東京大学特任准教授 神田 浩子, 東京大学講師 槙田 紀子, 東京大学講師 住田 隼一

Sustainable energy/renewable energy such as solar energy, wind energy and tidal energy is greatly attractive to produce hydrogen, which is expected to be the ultimate medium for worldwide storage and transport. A seawater magnetohydrodynamics (MHD) power generator/hydrogen generator is a unique system that not only transforms the kinetic energy of ocean and tidal currents directly into electric energy but also generates hydrogen gas as a by-product. Recently, a new helical-type seawater MHD generator with partitioned electrodes having a helical insulation wall with an outer diameter of 97 mm and a length of 155 mm and a 7 T solenoid superconducting magnet has been designed, fabricated and examined to elucidate the characteristics of the generator. It is important to predict performance of the helical-type generator for enlargement and feasibility. Using a simple helical model including the influence of an electromagnetic body force, calculation results of the characteristics of the large-scale generator are reported.

As an application of superconducting technology to the field of maritime sciences, we have studied the seawater magnetohydrodynamics (MHD) power generator/hydrogen generator using a high-field superconducting magnet, paying attention to the marine natural energy. The seawater MHD generator is a unique system that not only directly transforms the kinetic energy of an ocean current/tidal current into electric energy but also generates hydrogen gas in accordance with the law of electromagnetic induction, and has the advantages of having no mechanics and being maintenance free. Recently, a new helical-type seawater MHD generator having a helical insulation wall 97 mm in diameter and 155 mm long with partitioned electrodes and a 7 T solenoid superconducting magnet has been designed, made and examined to elucidate the relationship between characteristics of the generator and a helical flow. It was found that the electromotive force obtained was in agreement with the calculated value in the helical flow region, and independent of the direction of the induced electric field.