研究者詳細 - 河原　伸幸

MISC - 河原　伸幸

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512 2次元平面粒径計測法を用いた非定常噴霧における噴霧液滴粒径・流速計測(エンジンシステムI)

河原伸幸, 冨田栄二, 松本敬吾

講演論文集 2006 ( 44 ) 193 - 194 2006年2月

Combustion Characteristics and Performance of Supercharged Micro-pilot Natural Gas Engine

Fukatani, N, Tomita, E, Kawahara, N, Maruyama, K, Komoda, T

FISITA2006, 2006年

Local Equivalence Ratio Measurement of CH4/air and C3H8/air Laminar Flames with and without flame front by LIBS

Y. Ikeda, A. Nishiyama, N. Kawahara, T. Nakayama, E. Tomita

LIBS2006, Oral presentation 2006年

Highly Spatially Resolved Measurements of Laser-induced Plasma in Laminar Premixed Methane-Air Flow

T. Nakayama, N. Kawahara, E. Tomita, Y. Ikeda, J.L. Beduneau

LIBS2006，poster 2006年

Development of an aerosol nozzle to optimally deliver insecticides to the target and improve the agglomerative characteristics of the spray

Ikeda, Y, Kim, S.M, Horibe, Y, Takaki, S, Kawahara, N

ICLASS2006, 2006年

火花点火機関におけるノッキング時の自着火部の可視化

河原伸幸, 冨田栄二

自動車技術会ガソリン機関部門シンポジウム， No.17-06,pp.24-29. 2006年

LIBS法を用いた層流予混合火炎における当量比計測

池田裕二, 西山淳, 河原伸幸, 冨田栄二

日本分光学会レーザー誘起プラズマ分光部会・日本鉄鋼協会学会部門研究会”次世代鉄鋼迅速オンサイト分析の実用化”・合同講演会 2006年

層流予混合ガスにおけるレーザ誘起プラズマの高空間・高時間分解光学計測

河原伸幸, 池田裕二, 中山崇, 冨田栄二

日本分光学会レーザー誘起プラズマ分光部会・日本鉄鋼協会学会部門研究会”次世代鉄鋼迅速オンサイト分析の実用化”・合同講演会 2006年

Anchor Point Structure Measurements for Laminar Propane/Air and Methane/Air Premixed Flame using the Local Chemiluminescence Spectra

Y. Ikeda, A. Nishiyama, S.M. Kim, N. Kawahara, E. Tomita

31st International Symposium on Combustion, 2006 ( 44 ) 205 - 206 2006年

Spatially and Temporally Resolved Optical Measurement of Laser Ignition for Laminar CH4/Air Mixtures

Nakayama, T, Kawahara, N, Tomita, E, Ikeda, Y, Beduneau, J

31st International Symposium on Combustion, 2006年

A New Sensor for Temperature Measurement of Water by Laser Interferometry Technique

Tomita, E, Kawahara, N, Toda, Y

13th Int. Symp. on Application of Laser Techniques on Fluid Mechanics, 2006年

In-Situ Fuel Concentration Measurement Using an IR Spark Plug Sensor by Laser Infrared Absorption Method- Application to a Rotary Engine-

Kawahara,N, Tomita,E, Hayashi, K, Tabata, M, Iwai, K, Kagawa, R

13th Int. Symp. on Application of Laser Techniques on Fluid Mechanics, 2006年

In-Situ Fuel Concentration Measurement near Spark Plug by 3.392 m Infrared Absorption Method —Pressure and Temperature Dependence of the Gasoline Molar Absorption Coefficient

Kawahara, N, Tomita, E, Nishiyama, A, Hayashi, K

SAE 2006 World Congress, 2006年

記述言語：英語

This paper describes the development and application of a spark plug sensor using a 3.392 μm infrared absorption technique to quantify the instantaneous gasoline concentration near the spark plug. We developed an in situ laser infrared absorption method using a spark plug sensor and a 3.392 μm He-Ne laser as the light source; this wavelength coincides with the absorption line of hydrocarbons. First, we established a database of the molar absorption coefficients of premium gasoline at different pressures and temperatures, and determined that the coefficient decreased with increasing pressure above atmospheric pressure. We then demonstrated a procedure for measuring the gasoline concentration accurately using the infrared absorption technique. The history of the molar absorption coefficient of premium gasoline during the experiment was obtained from the established database using measured in-cylinder pressures and temperatures estimated by taking the residual gas into consideration. These values provided instantaneous fuel concentrations in the engine cylinder. We examined the mixture formation process near the spark plug in a port-injected spark-ignition (SI) engine for different fuel injection timings, and determined that when the injection timing was delayed, a rich mixture remained near the top of the combustion chamber. Copyright © 2006 SAE International.

DOI： 10.4271/2006-01-0182

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Local equivalence ratio measurement of CH4/Air and C3H8/Air laminar flames by Laser-Induced Breakdown Spectroscopy

Ikeda, Y. Nishiyama, A., *Kawahara, N. Tomita, E. Nakayama, T

44th AIAA Aerospace Sciences Meeting and Exhibit 2006年

DISI用インジェクタにおける微粒化過程の可視化

河原伸幸, 冨田栄二, 中山智裕, 住田守

微粒化シンポジウム講演論文集 = Symposium (ILASS-Japan) on Atomization 14 115 - 120 2005年11月

Measurement of flame propagation characteristics in an SI engine using micro-local chemiluminescence technique

Nobuyuki Kawahara, Eiji Tomita, Akira Takeuchi, Shigeyuki Arimoto, Yuji Ikeda, Atsushi Nishiyama

SAE Technical Papers 2005年

記述言語：英語

A small Cassegrain optics sensor was developed to measure local chemiluminescence spectra and the local chemiluminescence intensities of OH*, CH*, and C2* in a four-stroke spark-ignition (SI) engine in order to investigate the propagation characteristics of the turbulent premixed flame. The small Cassegrain optics sensor was an M5 type that could be installed in place of a pressure transducer. The measurements could be used to estimate the flame propagation speed, burning zone thickness, and local air/fuel (A/F) ratio for each cycle. The specifications of the small Cassegrain optics sensor were the same as those used for previous engine measurements. In this paper, measurements were made of several A/F ratios using gasoline to fuel the model engine. The performances of two Cassegrain optics sensors were compared to demonstrate the advantages of the new small sensor by measuring the local chemiluminescence intensities of a turbulent premixed flame in the model engine. The measurements suggested that the small Cassegrain optics sensor is superior to the conventional Cassegrain sensor and can provide stable data for measurements over several hours, which should be sufficient for practical combustion diagnostics. This sensor proved useful for estimating the flame propagation characteristics. In addition, the sensor should be useful for local A/F ratio measurements in an engine cylinder. Copyright © 2005 SAE International.

DOI： 10.4271/2005-01-0645

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In-situ unburned gas temperature measurement in a spark ignition engine using laser interferometry

Nobuyuki Kawahara, Eiji Tomita, Kenji Ohnishi, Kazuhiro Goto

SAE Technical Papers 2005年

記述言語：英語

A heterodyne interferometry system with a fiber-optic sensor was developed to measure the temperature history of unburned gas in a spark-ignition engine. A polarization-preserving fiber and metal mirror were used as the fiber-optic sensor to deliver the test beam to and from the measurement region. This fiber-optic sensor can be assembled in an engine cylinder head without a lot of improvements of an actual engine. Adjustment system in the sensor was revised to face the distributed index lens with metal mirror. Before the flame arrived at the developed fiber-optic sensor, measured temperature was almost same with the temperature history after the spark, assuming that the process that changes the unburned gas is adiabatic. In situ unburned gas temperature measurements before knocking in a commercially produced SI engine can be carried out using developed fiber-optic heterodyne interferometry system. Although the heterodyne interferometry with the developed fiber-optic sensor provides the mean temperature along the line of sight, the feasibility of our system was sufficient to be applied to temperature history measurement of an unburned gas compressed by flame propagation in an engine cylinder. The developed heterodyne interferometry with fiber-optic sensor has a good feasibility to measure the unburned gas temperature history in the commercially produced spark-ignition engine. Copyright © 2005 SAE International.

DOI： 10.4271/2005-01-0646

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Concentration Measurement of Unburned Hydrocarbons in Exhaust Gas from an SI Engine by Using 3.392 micrometer Absorption Method

Tomita, E, Kawahara, N

6th JSME-KSME Thermal Engineering Conference, 2005年

In-spark-plug sensor for analyzing the initial flame and its structure in an SI engine

Yuji Ikeda, Atsushi Nishiyama, Nobuyuki Kawahara, Eiji Tomita, Shigeyuki Arimoto, Akira Takeuchi

SAE Technical Papers 2005年

記述言語：英語

An in-spark-plug flame sensor was developed to measure local chemiluminescence near the spark gap in a practical spark-ignition (SI) engine in order to study the development of the initial flame kernel, flame front structure, transient phenomena, and the correlation between the initial flame kernel structure and cyclic variation in the flame front structure, which influences engine performance directly. The sensor consists of a commercial instrumented spark plug with small Cassegrain optics and an optical fiber. The small Cassegrain optics were developed to measure the local chemiluminescence intensity profile and temporal history of OH*, CH*, and C 2* at the flame front formed in a turbulent premixed flame in an SI engine. A highresolution monochromator with an intensified chargecoupled device (ICCD) and spectroscopy using optical filters and photomultiplier tubes (PMTs) were used to measure the time-series of the three radicals, as well as the in-cylinder pressure. Measurements were made at different engine speeds in an unmodified 223-cc practical SI engine fueled with gasoline. Stable data were obtained over several hours with little noise, and were of the same quality as data from a small M5-type sensor installed instead of a pressure transducer. The relationships between the radical intensities and indicated mean effective pressure (IMEP) were examined and typical cyclic variation was measured at speeds over 7,000 rpm. The behavior of the initial flame was followed from its arrival at the measurement point. The arrival time was faster and IMEP was larger at stoichiometry than under other air/fuel (A/F) conditions. Copyright © 2005 SAE International.

DOI： 10.4271/2005-01-0644

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点火プラグ実装型燃料濃度計測センサ

河原伸幸, 冨田栄二

日本機械学会誌 Vol.108, No.1037, p311. ( 1037 ) 311 - 311 2005年

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