著者

河野 通方 新岡 嵩

出版者

公益社団法人 応用物理学会

雑誌

応用物理 (ISSN:03698009)

巻号頁・発行日

vol.62, no.4, pp.329-335, 1993-04-10 (Released:2009-02-05)

参考文献数

5

被引用文献数

1

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無重力状態における燃焼の研究のなかで,ロウソクに関するものがわが国,米国,ヨーロッパなどで行われている.最近のスペースシャトルでの実験では約1分で消えてしまった.なぜ消えてしまったのかについて考察を行う過程において,その研究が実は拡散燃焼と呼ばれる燃焼学における重要な研究分野に貢献していることを述べる.さらに,この考察をもとにした無重力状態で長時間燃焼可能なロウソクのアイデアを紹介する.

著者

中谷 辰爾 笠原 希仁 芝 世弐 大坂 淳 津江 光洋 河野 通方

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.52, no.610, pp.487-493, 2004 (Released:2005-01-05)

参考文献数

46

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Numerical analysis of O3 depletions by exhaust plume from stratospheric flight at the altitude of 25km was conducted. Expanding box method was employed to simulate a diffusion of exhaust plume in the stratosphere. Concentrations of chemical species and normarized sensitivities of O3 concentration for reactions were estimated by fifth-order BDF method. Chemical kinetics include NOx, HOx and Ox chemistry. As results, it takes over two days that O3 concentration within a plume becomes ambient lebel within 1ppb. O3 perturbations were changed by an effect of plume-emission time, and they are bigger in daytime than in nighttime. Distributions of sensitivities of O3 concentrations for reactions are also changed for the plume-emission time. O3 depletion is greater by NOx than by HOx in exhaust plume.

著者

カマル イザム 上田 隆正 荒木 幹也 志賀 聖一 宮下 直幸 小保方 富夫 津江 光洋 河野 通方

出版者

一般社団法人日本エネルギー学会

雑誌

日本エネルギー学会大会講演要旨集

巻号頁・発行日

no.12, pp.310-311, 2003-07-30

著者

三上 真人 嶺山 隆志 伊藤 勝幸 河野 通方

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集B編 (ISSN:03875016)

巻号頁・発行日

vol.62, no.600, pp.3178-3184, 1996

被引用文献数

1

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The droplet combustion of n-heptane, benzene and ethyl alcohol was investigated in acoustic fields. The frequencies of the acoustic waves used were around the characteristic frequencies of droplet combustion ; the residence frequency and the diffusion frequency. Under low frequency conditions (70-200 Hz), the experimental results can be interpreted by the mechanism of quasi-steady state combustion, which includes all types of droplet combustion ; the envelope name, wake flame and flame extinction. Under high frequency conditions (300-800 Hz), the combustion is possibly influenced by a diffusional mechanism which is induced by acoustic waves of such high frequency.igh frequency acoustic waves increase the flame luminosity, especially for benzene and n-heptane droplets. This suggests that the high frequency acoustic wave enhances radiant heat transfer from the flame zone to the droplet, and thus the burning rate constant increases.

著者

森上 修 羽原 修 榎本 啓士 加藤 秀輝 三上 真人 佐藤 順一 河野 通方

雑誌

JASMA : Journal of the Japan Society of Microgravity Application (ISSN:09153616)

巻号頁・発行日

vol.12, no.4, pp.315-316, 1995-10-31

参考文献数

2

著者

三上 真人 加藤 秀輝 佐藤 順一 河野 通方

出版者

一般社団法人日本機械学会

雑誌

日本機械学会論文集. B編 (ISSN:03875016)

巻号頁・発行日

vol.61, no.582, pp.731-737, 1995-02-25

参考文献数

16

被引用文献数

1

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The effect of gravity on fuel droplets burning interactively has been studied experimentally. Experiments on two droplets aligned horizontally were conducted both in normal gravity and in microgravity. Results show that in normal gravity, oxygen starvation between the flames is not as severe as in microgravity. Natural convection, which supplies oxygen to the flame, is stronger at a smaller initial separation distance when two flames exist separately. The instantaneous burning rate for the same normalized droplet diameter has a maximum in normal gravity when the initial separation distance is changed and decreases monotonically in microgravity with decreasing initial separation distance, except for the initial period of burning. Thus, the effect of gravity, which decreases the burning lifetime, is greatest at a certain initial separation distance.

著者

三上 真人 加藤 秀輝 佐藤 順一 河野 通方

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集B編 (ISSN:03875016)

巻号頁・発行日

vol.61, no.582, pp.731-737, 1995

被引用文献数

1

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The effect of gravity on fuel droplets burning interactively has been studied experimentally. Experiments on two droplets aligned horizontally were conducted both in normal gravity and in microgravity. Results show that in normal gravity, oxygen starvation between the flames is not as severe as in microgravity. Natural convection, which supplies oxygen to the flame, is stronger at a smaller initial separation distance when two flames exist separately. The instantaneous burning rate for the same normalized droplet diameter has a maximum in normal gravity when the initial separation distance is changed and decreases monotonically in microgravity with decreasing initial separation distance, except for the initial period of burning. Thus, the effect of gravity, which decreases the burning lifetime, is greatest at a certain initial separation distance.

著者

大坂 淳 瓜生田 義貴 今村 宰 山下 清孝 高橋 周平 津江 光洋 河野 通方

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.55, no.637, pp.98-103, 2007

被引用文献数

1 3

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An experimental research on supersonic combustion of kerosene in a model scramjet combustor has been conducted. Kerosene was injected normally into a Mach 2 by three types of methods. First, liquid kerosene was directly injected. In comparison with hydrogen, combustion did not take place at low total temperature or in the fuel lean condition. Secondly, “effervescent atomization” method was used. Effervescent atomization method could control penetration height and mass flow rate independently, and improve ignition limits of liquid kerosene. Finally, gaseous kerosene was used. While only intensive combustion mode and choke mode were observed when liquid kerosene was used, existence of transition mode was observed when gaseous kerosene was used.