研究者詳細 - 河原　伸幸

MISC - 河原　伸幸

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Effect of Nozzle Geometry on Atomization of Transient Spray from Port Fuel Injector

Fatma Ahmed, Kawahara, N, Tomita, E, Sumida, M

COMODIA2008, Paper No. SC3-2, in CD-ROM 429 - 436 2008年12月

The present paper reports an experimental investigation of the effect of nozzle geometry of port fuel injector PFI on exit flow velocity, the stability of primary spray behavior and spray droplet size. Several types of PFI with were tested. The investigation of exit flow velocity and stability (wavelength) of spray structure was performed using an ultra high-speed video camera (max. camera speed 1Mfps) with a long-distance microscope (whole image). The visualized experiments were carried out in a closed chamber at the atmospheric pressure. With back-lighting, the time-series images of the spray behavior were obtained. Using ultra high-speed camera with long-distance microscope and Barlow lens, droplet diameter could be visualized with high temporal resolution (magnified image). Experimental results of average exit velocity compared with NOZZLE FLOW model where experimental results of stability and droplet diameter compared with KH-RT breakup model. Experimental investigation showed that exit velocity, droplet diameter and stability (wavelength) influence by nozzle geometry. Copyright © 2008 by the Japan Society of Mechanical Engineers.

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Spray Behavior near the Nozzle of a DISI Multi-Hole Injector Using Phase Doppler Anemometer

Mohamed Esmail, Kawahara, N, Tomita, E, Sumida, M

COMODIA2008, Paper No. SC4-1, in CD-ROM 445 - 452 2008年12月

The spray from a multi-hole injector applied to direct injection spark ignition (DISI) engine was investigated. The spray has been injected into a constant volume chamber and has been visualized with a high speed video camera with a long distance microscope and quantified in terms of droplet velocity and diameter with HiDense PDA system. HiDense PDA system permits accurate measurements in spray with extremely high particle concentrations, and it is the only PDA system available that provide high quality measurements in the core region of the spray cone. The spray close to the nozzle has been investigated. Also the spray at the center axis far from the nozzle has been investigated at different injection pressure. PDA data have been processed by using a time-dividing method which divides the spray information into four distinct periods (F, C, R and T). As a result it was found that large particles ∼ (85 μm) which are injected at high speed ∼ (90 m/s) in the earliest stage lose their velocity rapidly due to breakup into smaller droplets and are overtaken by smaller but slower particles which are emitted during a later stage. The results also show that within the measured range the effect of injection pressure on droplet size was rather small. Copyright © 2008 by the Japan Society of Mechanical Engineers.

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Fuel spray and its measurement techniques

Nobuyuki Kawahara, Eiji Tomita

Nihon Enerugi Gakkaishi/Journal of the Japan Institute of Energy 87 897 - 902 2008年11月

In this report, fuel spray, especially engine application, and measurement techniques for fuel injection characteristics, such as break-up of liquid column, spray angle, penetration length, followability of droplets, droplet dispersion, entrainment vortex structure and so on, are explained. Microscopic visualization of liquid column break-up process in a gasoline PFI injector and simultaneous measurements of droplet diameter and velocity using phase Doppler anemometer (PDA/PDPA) are introduced as examples of measurement techniques. Obtained knowledge of spray and atomization characteristics using these techniques are mentioned in the case of unsteady spray from a gasoline injector.

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軽油パイロット着火小型天然ガスエンジンのノック特性と分光計測

冨田栄二, 河原伸幸, 坂根篤

三井造船技報 ( 195 ) 41 - 47 2008年10月

軽油着火過給ガスエンジンにおけるバイオ燃料の燃焼・排気特性

冨田栄二, 河原伸幸, 薦田哲男

日本機械学會誌 = Journal of the Japan Society of Mechanical Engineers 111 ( 1076 ) 611 - 611 2008年7月

816 軽油着火過給式天然ガスエンジンにおける分光学的燃焼診断(エンジンシステムI)

冨田栄二, 河原伸幸, 久枝雄介, 薦田哲男

講演論文集 2008 ( 46 ) 309 - 310 2008年2月

超高速度カメラの応用

河原伸幸, 冨田栄二

日本機械学會誌 = Journal of the Japan Society of Mechanical Engineers 111 ( 1071 ) 120 - 123 2008年2月

Microscopic Visualization of Liquid Column Break-up Process in Gasoline PFI Injector

Kawahara, N, Tomita, E, Sumida, M

14th Int. Symp. on Application of Laser Techniques on Fluid Mechanics, Paper No. 11.2.2, in CD-rom 2008年

Visualization of Knocking Combustion in a Hydrogen Spark-Ignition Engine

Kawahara, N, Tomita, E, Yoshitomi, M

Meeting the Challenges to Sustainable Mobility 3 - 9 2008年

Fuel Concentration Measurements of Premixed Mixture Using Spark-Induced Breakdown Spectroscopy

Kawahara, N, Ikeda, Y, Tomita, E, Takemoto, S

5th International Conference on Laser-Induced Breakdown Spectroscopy (LIBS2008) 22 - 26 2008年

Effect of Gas Flow on Combustion and Exhaust Emissions in a Dual Fuel Natural Gas Engine

Tomita, E, Kawahara, N, Ohuchi, S, Komoda, T, Sakane, A

Journal of KONES Powertrain and Transport 15 ( 2 ) 519 - 527 2008年

Soot formation during knocking combustion in a spark-ignition engine

Kawahara, N, Tomita, E, Masatsuki, H

Int. Symp. on Combustion, Accepted Poster, Paper No. 1P79 2008年

Knock in a Hydrogen Spark-Ignition Engine

Kawahara, N, Tomita, E, Yoshitomi, M

Int. Symp. on Combustion, Accepted Poster, Paper No. 1P74. 2008年

Temperature Measurement of Water with a Sensor by Laser Interferometry Technique

Tomita, E, Kawahara, N

14th Int. Symp. on Application of Laser Techniques on Fluid Mechanics, Paper No. 6.3.4, in CD-rom 2008年

位相ドップラ法（PDA/PDPA）を用いた噴霧粒子径および速度の同時計測

河原伸幸, 冨田栄二

日本流体力学会誌「ながれ」 27 ( 4 ) 303 - 310 2008年

719 DISIインジェクタが形成する非定常噴霧構造の観察(エンジンシステムII,動力エネルギーシステム)

河原伸幸, 冨田栄二, 中筋寛明, 住田守

講演論文集 2007 ( 45 ) 273 - 274 2007年3月

721 層流予混合火炎のレーザ消火における数値解析(エンジンシステムII,動力エネルギーシステム)

河原伸幸, 冨田栄二, 熊谷亮佑

講演論文集 2007 ( 45 ) 277 - 278 2007年3月

718 レーザ誘起ブレイクダウン分光法によるエンジン排気ガス計測(エンジンシステムII,動力エネルギーシステム)

河原伸幸, 冨田栄二, 前原豊光, 池田裕二

講演論文集 2007 ( 45 ) 271 - 272 2007年3月

716 LIF法を用いたガスエンジン内燃料濃度分布計測(エンジンシステムI)

冨田栄二, 河原伸幸, 深谷信彦, 藤岡伸行

講演論文集 2007 ( 45 ) 267 - 268 2007年3月

計測 : レーザ誘起蛍光法

河原伸幸

微粒化 = Atomization : journal of the ILASS-Japan 15 ( 52 ) 165 - 167 2007年1月

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