著者

佐藤 桂司 林田 和宏 天谷 賢児 新井 雅隆

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.70, no.692, pp.1051-1057, 2004-04-25

被引用文献数

12

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In this paper, separation of laser-induced fluorescence (LIF) due to PAHs and incandescence (LII) due to soot by time-resolved measurement was demonstrated for the propane diffusion flame. Laser-induced fluorescence method for the measurement of polycyclic aromatic hydrocarbons (PAHs) in diffusion flame was developed. A KrF excimer laser was used for excite the PAHs. Strong laser-induced incandescence due to soot was appeared with fluorescence signal due to PAHs. In order to separate the signals into LII and the PAHs-LIF detected from diffusion flame, time-resolved measurement was carried out. A pico-second gate CCD camera with a image intensifier was used taking a time-resolved image. From the two different images, which were taken at different time-delay, PAHs-LIF and LII were obtained. Intensity distributions of PAHs-LIF and LII were measured on the flame axis. Overlap region of the LIF and LII was observed around the onset position of the yellow flame. In this region, LIF intensity decreased and LII intensity increased along the flow direction. It seemed that this region was transition region from the PAHs to soot and was attributed the presence of soot precursor.

著者

大八木 重治 落合 辰夫 吉橋 照夫 針谷 安男

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.54, no.508, pp.3559-3564, 1988-12-25

被引用文献数

7

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Detonation cell size has been measured in a mixture of hydrogen with oxygen over wide ranges of equivalence ratio and subatmosheric initial pressure. The experiments have been carried out in a cylindrical tube of diameter 30 mm and the cell size has been determined by using the sooted plate technique. The data of the cell size at subatomospheric pressures have indicated that it is proportional to p_0^<-1.2>, where p_0 is an initial pressure of the mixtures. Values at the atmospheric pressure have been obtained by extrapolating the obtained subatmosheric values of the cell size, and have been plotted against the equivalence ratio and compared with calculated induction zone length by Westbrook. The fact that the cell size is directly proportional to the induction zone length has been verified for the oxyhydrogen mixture over the range of the equivalence ratio tested. The proportionality factor for this mixture has been found to be 23.3, while that for hydrogen/air mixtures had been found by Knystautas et al. to be 52.2. The critical initiation energies etimated from the cell size data obtained here by utilizing the theoretical model proposed by Lee have been found to be in good agreement with measured critical initiation energies by the critical tube diameter method of Matsui and Lee.

著者

三宅 裕 稲葉 武彦 久保 尚重 竹岡 順一

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.50, no.460, pp.3211-3217, 1984-12-25

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Externally pressurized supersonic gas thrust bearings whose generation of load capacity is substantially independent of the viscosity of working fluids, have been proposed and analyzed by the authors. This report presents the experimental results of the static characteristics of this new type of bearings. The experimental results including load capacity, stiffness, mass flow rate and pressure distributions in the bearing clearance, generally show a good agreement with the theoretical predictions and verify the validity of this new bearing. The effect of an orifice to improve the stiffness is also examined. Some problems which should be solved to put the bearing in practical use are pointed out.

著者

志賀 聖一 江原 秀治 柄沢 隆夫 倉林 俊雄

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.51, no.471, pp.3823-3827, 1985-11-25

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In previous paper, it was suggested the effect of exhaust gas recirculation (EGR) on the diesel knock is relevant to the reaction rate of spontaneous ignition which occurs at the initial stage of diesel combustion. In a present study, this suggestion is verified by measuring the ignition lag and separating it into physical and chemical lags by applying the statistical technique presented by S. Kumagai. Under the operating condition used in this study, the physical lag is rather longer than the chemical lag and hardly changes with an increase in EGR ratio. On the other hand, the chemical lag is considerably affected by EGR. Though the dependent behaviour of the chemical lag on EGR is not simple, it is clearly shown that the tendency of chemical lag versus EGR ratio is quite the reverse of that of the diesel knock intensity. This means that the diesel knock intensity with EGR is dominated by the reaction rate of spontaneous ignition.

著者

吉川 大雄 菱沼 孝夫 近久 武美

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.66, no.652, pp.3218-3225, 2000-12-25

被引用文献数

17

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The humidification system in a PEFC is handicapped by the water management under a range of temperatures including low temperatures in winter, so the performance with and without humidification was considered and simulated for a variety of fuel cell temperatures. The characteristice of a single cell with a cell area of 104 cm^2 was identified by experiments and a one dimensional model was developed to evaluate cell performance. The experiments found that water managements are important because the ionic conductivity of the membrane and catalyst layers decreases when there is little humidity. Results of start-up tests with the cell showed that the fuel cell recover the performance quickly in temperature as low as 10℃. The one dimensional simulation model showed that the measured cell performance agrees with the modeling results for various humidity conditions of the cell. If low reaction temperatures and low current densities are selected as operating conditions, it would be possible to apply the dry system at the start-up.

著者

松本 浩二 塩川 康夫 岡田 昌志 川越 哲男 カン・チェドン 平澤 良男

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.67, no.655, pp.804-809, 2001-03-25

被引用文献数

4

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An ice storage is one of the ways of effective use of thermal energy. So, studies on a slush ice as thermal storage material have been done. We have also been studying on a suspension (slush ice) made of oil-water mixture with cooling and stirring. From our study result, it was found that a kind of additive having amino group (-NH_2) and silanol group (-SiOH) was essential to make the suspension with high IPF without adhesion of ice to a cooling wall. Moreover, formed ices in the suspension were dispersed and granular state and ices did not stick each other. In the present paper, we carried out experiments to clarify the characteristics of the suspension formation process. From the experimental results, it was found that the substance in the suspension was not ice but a compound consisting of ice and additive by a thermal analysis of fusion of the substance. Then, at very small depression of solidification point (about 7℃) all water of the mixture could be solidified by using the additive.

著者

能登 勝久 矢場田 真 中島 健

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.64, no.623, pp.2311-2318, 1998-07-25

被引用文献数

6

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The cause and effect of fluid type on thermo-fluid pattern of the suppression of the isothermal Karman vortex street to a modified vortex street and a plume-like flow due to positive buoyancy in a circular cylinder wake with an upward freestream of mercury, air and water are made clear by solving numerically of the two-dimensional, laminar, time-dependent continuity equation, Navier-Stokes equations with the buoyancy term, and energy equation. For any type of fluid, the cause of the suppression is an extinction of wake vorticity ; shear layers increases and the wake vorticity decreases due to positive buoyancy. Behavior of the suppression is different each other in mercury, air and water, beacuse an increase of the wall vorticity and a decrease of the wake vorticity are different in those fluid.

著者

岡村 隆成 古閑 昭紀 川岸 裕之

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.66, no.646, pp.1436-1443, 2000-06-25

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The heat transfer characteristics and flow behavior in a rectangular passage with two opposite 45゜skewed ribs for turbine rotor blade have been investigated for Reynolds numbers from 7800 to 19000. In this blade, the spanwise coolant passage at the trailing edge region whose thickness is very thin is chosen, so the channel aspect ratio(=width/height of channel)is extremely high, 4.76. Therefore the heat transfer experiment in the high aspect ratio cooling channel was performed using thermochromic liquid crystal and thermocouples. Furthermore the calculation of flow and heat transfer was carried out using CFD analysis code to understand the heat transfer experimental results. The enhanced heat transfer coefficients on the smooth side wall at rib leading end were the same level as those on the rib roughened walls.

著者

谷下 一夫 棚沢 一郎 山口 隆美 菅原 基晃

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.50, no.456, pp.1945-1954, 1984-08-04

被引用文献数

1

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血液における炭酸ガス拡散係数は,人工肺のガス交換性能を評価するために必要であるが,実測値が全くない.そこで,静止血液試料層を用い,準定常法により炭酸ガスの有効拡散係数を測定した.温度の下降および赤血球濃度,血しょう(漿)たん白濃度の増加とともに,拡散係数が低下する結果を得た.さらに,赤血球内の炭酸脱水酵素の効果により,溶血した血液およびヘモグロビン溶液において顕著な促進拡散が認められた.