著者

平田 邦夫 上條 謙二郎 升谷 五郎

出版者

一般社団法人 日本航空宇宙学会

雑誌

日本航空宇宙学会論文集 (ISSN:13446460)

巻号頁・発行日

vol.53, no.614, pp.123-129, 2005 (Released:2005-05-20)

参考文献数

3

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Idle spin phenomena were observed at rapid transient phase in liquid hydrogen pumps for rocket engines. Failure analyses were conducted and evaluation equations to estimate the shift of the operation point of the pump were derived in this paper. It was revealed that rapid fall of hydrogen flow rate resulted in decrease of pump efficiency which caused excessive temperature rise up to the saturation of the pump fluid.

著者

片岡 健太 吹場 活佳 平田 邦夫

出版者

一般社団法人 日本機械学会

雑誌

動力・エネルギー技術の最前線講演論文集 : シンポジウム

巻号頁・発行日

vol.2014, pp.5-8, 2014

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It is necessary for thermal power plant to achieve high heat efficiency and to use an alternative energy source because of global warming and exhaustion of fossil fuels. Heat efficiency of latest thermal power plants reaches to 60% and researches to achieve more high heat efficiency are done, for example, rising burning temperature and pressure ratio. However these measures can improve heat efficiency only few points. In this study, we try to get jumping raise of heat efficiency by reducing compression work of air compressor. To reduce compression work, we devise new system which liquefies air by using cool heat of liquid hydrogen and we propose to use liquid oxygen as the oxidizer. In this paper, we explain about this new system and calculated results which reaches 73% of heat efficiency.