著者

小口 瞳史 三上 真人 西川 智博

出版者

公益社団法人 自動車技術会

雑誌

自動車技術会論文集 (ISSN:02878321)

巻号頁・発行日

vol.53, no.1, pp.145-150, 2022 (Released:2022-01-25)

参考文献数

8

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コンロッド肉抜き部形状を変更することによりピストン-コンロッド連成振動の固有振動数を変化させ,それが燃焼起因振動に与える影響を,実機実験とシミュレーション双方により解析した.

著者

小口 瞳史 荻山 彪吾 三上 真人

出版者

公益社団法人 自動車技術会

雑誌

自動車技術会論文集 (ISSN:02878321)

巻号頁・発行日

vol.53, no.2, pp.314-319, 2022 (Released:2022-03-04)

参考文献数

6

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ディーゼルエンジンにおいて,燃焼衝撃の伝達経路である主軸受では燃焼衝撃によって粗さ接触が生じることがあるが,粗さ接触圧力の有無によって燃焼起因振動の伝達特性,減衰特性が変化することが筆者らの研究によって示唆されているため,主軸受粗さ接触が燃焼起因振動に与える影響をシミュレーションによって解析した.

著者

劉 本柱 三上 真人 小嶋 直哉

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.3220-3226, 1996

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The flow induced noise from an expansion cavity-type muffler increases abruptly for some sizes of mufflers and flow velocities. This phenomenon is strongly related to the resonance of the tail pipe and the cavity of the muffler ; therefore, it is called the predominance of resonance″When the cavity length is increased, the measured resonance frequency shows periodic jumps. The cause of the predominance of resonance is assumed to be the generation of vortex rings with a particular frequency in the cavity. The generation of vortex rings is verified by analyzing fluctuating velocities in the cavity when the predominance of resonance occurs. The phenomenon is induced not only by the tail pipe resonance, but also by the cavity resonance. It is suggested that there exists the feedback phenomenon from the sound to the flow and it is strongly related to the sound pressure level in the cavity.

著者

劉 本柱 三上 真人 小嶋 直哉

雑誌

日本騒音制御工学会技術発表会講演論文集

巻号頁・発行日

vol.1995, pp.205-208, 1995-09

参考文献数

4

著者

相本 幸宏 池田 光優 三上 真人 小嶋 直哉

出版者

一般社団法人 日本機械学会

雑誌

中国四国支部総会・講演会 講演論文集

巻号頁・発行日

vol.2002, pp.107-108, 2002

著者

池田 光優 三上 真人 小嶋 直哉

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.64, no.625, pp.3126-3132, 1998

被引用文献数

1

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Attempts have been made to improve exhaust gas characteristics of the direct injection diesel engine under dual-fuel operation with gas oil and LPG. In dual-fuel operation with LPG as a sub-fuel, two kinds of LPG mixing methods can be employed. One is LPG mixing in gaseous state with the intake air, which is so-called "fumigation". The other is LPG mixing in liquid state with gas oil prior to injection. The experimental results show that the mixing method in liquid state is better than the fumigation method in terms of NO and THC emission and specific energy consumption. In the mixing method in liquid state, NO is reduced in comparison with the base engine without the increase in THC, smoke and specific energy consumption if a proper squish intensity is employed.

著者

和泉 晴夫 三上 真人 小嶋 直哉

出版者

山口大学工学部

雑誌

山口大学工学部研究報告 (ISSN:03727661)

巻号頁・発行日

vol.49, no.1, pp.1-6, 1998-10

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気流を伴う消音器内で発生する気流音の特性は,流速や消音器構造に複雑に依存しており,共鳴音を含め音響学的解明は不十分である。本研究は,気流音の発生メカニズムを従来の研究よりさらに深く洞察するために,実験的に空胴部共鳴周波数と尾管部共鳴周波数の間に移行現象があることを認めたので,理論的考察の一方法として四端子定数で厳密計算し,周波数移行現象の予測と実験との対応を行い,発生機構の整理を行った。

著者

劉 本柱 三上 真人 小嶋 直哉

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.3220-3226, 1996-08-25

参考文献数

11

被引用文献数

2

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The flow induced noise from an expansion cavity-type muffler increases abruptly for some sizes of mufflers and flow velocities. This phenomenon is strongly related to the resonance of the tail pipe and the cavity of the muffler ; therefore, it is called the predominance of resonance゛When the cavity length is increased, the measured resonance frequency shows periodic jumps. The cause of the predominance of resonance is assumed to be the generation of vortex rings with a particular frequency in the cavity. The generation of vortex rings is verified by analyzing fluctuating velocities in the cavity when the predominance of resonance occurs. The phenomenon is induced not only by the tail pipe resonance, but also by the cavity resonance. It is suggested that there exists the feedback phenomenon from the sound to the flow and it is strongly related to the sound pressure level in the cavity.

著者

倉橋 吉則 三上 真人 小嶋 直哉

出版者

一般社団法人 日本機械学会

雑誌

中国四国支部総会・講演会 講演論文集

巻号頁・発行日

vol.5, pp.109-110, 2000

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

出版者

社団法人 日本流体力学会

雑誌

日本流体力学会誌「ながれ」 (ISSN:02863154)

巻号頁・発行日

vol.20, no.2, pp.106-115, 2001

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 大八木 大史 小嶋 直哉 菊池 政雄 若嶋 勇一郎 依田 真一

出版者

一般社団法人 日本燃焼学会

雑誌

日本燃焼学会誌 = Journal of the Combustion Society of Japan (ISSN:13471864)

巻号頁・発行日

vol.45, no.134, pp.238-247, 2003-11-30

参考文献数

30

被引用文献数

3

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<p>A new concept of the droplet array generation technique was proposed to realize a high quality and high reliability performance of microgravity experiments of multiple-droplet combustion. Each fuel droplet was formed on the intersection of the X-shape fine SiC fibers by supplying the liquid fuel through a fine glass tube. Several sets of the X-shape fibers and corresponding fine glass tubes were aligned at an interval to make a droplet array. All the droplets in array were simultaneously generated in a short time. In flame spread experiments, an end-droplet was ignited by a hot-wire igniter to initiate the flame spread along the array. Microgravity experiments of droplet array combustion were demonstrated with the new droplet array generation technique using a drop experiment facility MGLAB in Japan. In microgravity, large droplets, which were often failed to be generated in normal gravity, were successfully generated through this method. The present technique is also effective in droplet array combustion experiments using a high-volatility fuel, whose prevaporization is not negligible. The flame spread rate and the flame spread limit of linear droplet arrays were compared with existing experimental results. Effects of the suspending fiber on the flame spread were also discussed.</p>

著者

三上 真人 八木 孝 小嶋 直哉

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.64, no.624, pp.2690-2695, 1998

被引用文献数

2

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Occurrence behavior of microexplosion in droplet combustion of fuel mixtures is studied. Experiments were performed using unsupported droplets of n-alkane/n-hexadecane mixtures in normal gravity. It was found that the occurrence of microexplosion is stochastic and cannot be predicted by the classical criterion for microexplosion occurrence using the limit of superheat and the droplet temperature. An occurrence model for the microexplosion based on the homogeneous nucleation theory is presented and shows that the occurrence probability of the microexplosion is determined by the ratio of the liquid phase lifetime to the nucleation time during the quasi-steady vaporization period. The nucleation time is inversely proportional to the nucleation time is inversely proportional to the nucleation rate and superheated liquid volume. The relative value of the droplet temperature and the limit of superheat affects the occurrence probability through the nucleation rate. It can be well explained by the model that the occurrence probability has the maximum value for a certain initial concentration of the fuel mixture.

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

三上 真人 瀬尾 健彦 菊池 政雄 森上 修

出版者

山口大学

雑誌

基盤研究(B)

巻号頁・発行日

2012-04-01

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ジェットエンジン高空再着火時の燃料噴霧燃え広がりの理解を深めるために低圧における液滴列燃え広がりの微小重力実験行った.実験の結果,低圧での燃え広がり速度および燃え広がり限界はともに,大気圧の場合より大きくなることが明らかとなった.これらの圧力依存性について,燃え広がりに関わる素過程を考慮して考察を行った.高温領域の熱伝導速度は圧力に逆比例する.一方,高温領域の広がりの非定常性を考慮すると,その最大半径は圧力の-1/3乗に比例する.この圧力依存性を有する燃え広がり限界距離を考慮して,低圧におけるランダム分散液滴群の群燃焼発現特性を求めることができた.

著者

三上 真人

出版者

日本液体微粒化学会

雑誌

微粒化 = Atomization : journal of the ILASS-Japan (ISSN:13416022)

巻号頁・発行日

vol.17, no.57, pp.16-21, 2008-03-31

参考文献数

41

著者

角屋 好邦 馬越 龍太郎 河合 久孝 守中 康治 三上 真人 添田 暉平

出版者

社団法人日本鉄鋼協会

雑誌

鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)

巻号頁・発行日

vol.87, no.8, pp.564-569, 2001-08

被引用文献数

1

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The 2.25CrMoV steel is applied to conventional combined high-pressure (HP) and low-pressure (LP) rotor forging, and it has excellent creep properties and toughness at 538℃ conventional steam temperature. However, at 566℃ steam temperature, it is required to improved the properties of the rotor forgings. The effects of chemistry on toughness and creep rupture strength have been investigated on the 9CrMoV base materials for the purpose of developing a new HP-LP rotor material for 566℃ steam temperature. Thus 9.8Cr1.4Mo1.0NiVNbN steel, named HLP9F, with higher toughness and creep rupture strength compared with conventional 2.25CrMoV steel, has been developed. A trail HP-LP rotor forging with the diameter of LP section of 1800mm and that of HP section of 1200mm has successfully been manufactured through the VCD process from 68t ingot. In spite of a large ingot, neither chemical composition change nor eutectic Nb(C, N) formation could be recognized. The rotor, furthermore, exhibited satisfactory quality in toughness and creep rupture strength. This rotor material is suitable to the HP-LP rotor material for advanced combined cycle steam turbine.

著者

劉 本柱 岡 智弘 三上 真人 小嶋 直哉

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.63, no.611, pp.2500-2506, 1997-07-25

被引用文献数

1

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Predominant resonance can occur in flow-induced noise from an expansion-cavity-type muffler for particular combinations of muffler configuration and flow velocity. This phenomenon is caused by self-excited oscillation based on the feedback response from acoustic resonances of the muffler to shear flow. Usually, the sound pressure level is much higher when predominance of tail pipe resonance rather than cavity resonance occurs. The predominance of tail pipe resonance is shown to be strongly influenced by both the frequency characteristics of acoustic amplification of the tail pipe and the frequency of velocity fluctuation with a certain phase criterion. The predominance phenomena can be generalized using a new dimensionless independent variable, (L/l')(1/M), where L, l' and M are cavity length, acoustically equivalent tail pipe length and Mach number in the tail pipe, respectively.