著者

渡 哲郎

出版者

経営史学会

雑誌

経営史学 (ISSN:03869113)

巻号頁・発行日

vol.20, no.4, pp.29-54, 1986-01-30 (Released:2010-11-18)

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Nippon Electric Power Co. Ltd. (Nippon Denryoku) was founded after World War 1 as a subsidiary of Ujigawa Electric Power Co. Ltd. (Ujigawa Denryoku), with the intention that its main business would be the supply of wholesale electricity to Ujigawa.However, Ujigawa decided to go into partnership with, and to buy electricity from, Great Consolidated Electric Power Co. Ltd. (Daido Denryoku), which had completed electric power transmission facilities to Osaka before Nippon Electric, and so Nippon Electric lost its largest customer. It was forced to seek other purchasers for its electricity to replace Ujigawa and, undertaking a positive sales drive, found customers in Osaka, Hyogo, Kyoto, Aichi and Toyama Prefectures.As a result of this Nippon Electric was able to break away from its parent company and become independent. The main reasons for its growth were the low price of the electricity it supplied and the rapid expansion of the power supply market in the 1920s caused by the electrification of industry.However, in the process of becoming independent Nippon Electric practiced unrealistic financial management, letting for example its depreciation reserve become insufficient, and consequently in the Showa depression which followed, the company found itself in a serious crisis.

著者

井上 雅弘 金子 賢二 瀬戸口 俊明 猿渡 哲郎

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. B編 (ISSN:03875016)

巻号頁・発行日

vol.53, no.496, pp.3691-3698, 1987-12-25

被引用文献数

6

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A Wells turbine operating under irregular wave conditions has been analyzed theoretically. It is shown that the turbine performance depends on a unique parameter, including characteristic parameters of the irregular wave, turbine speed and dimensions of the turbine and air chamber. In order to obtain the optimum value of this parameter, a model test has been performed using a computer-controlled wind tunnel, which can simulate arbitrary oscillating flows based on spectra of irregular waves. From this value a set of optimum dimensions of a Wells turbine system can be determined. Furthermore, starting and running characteristics of the Wells turbine have been obtained by a computer simulation. It is possible to predict the optimum value of the parameter and behavior of the output coefficient by computer simulation.