Presentations -
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High-Speed Flash Schlieren 3D-CT(Computer Tomography) Measurement of Instantaneous Density Distributions of High Speed Fluctuating Flows in Supersonic Jets
Yojiro ISHINO, Ahmad Zaid NAZARI, Takanori MOTOHIRO, Ryoya YAMADA, Fumiya ITO, Haruumi KONDO, Yoshiaki MIYAZATO,Sinichiro NAKAO
Event date： 2019.09
Language：Japanese Presentation type：Oral presentation (general)
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ウエアラブル＆ロボットアームで遠隔地の温・力触覚環境を体験！
石野 洋二郎，鶴谷 敏之，杉浦 良，ENKHTUR Bayarjavkhlan
イノベーション・ジャパン2019 大学見本市 国立研究開発機構 科学技術振興機構
Event date： 2019.08
Language：Japanese Presentation type：Poster presentation
Venue：東京ビッグサイト 青海展示棟B
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Study on Combustion Incineration of CFRP (SEM Observations of Nano Level Sharpening of Carbon Fiber Residue Tips and Temperature Measurements Based on Heat Radiation Images) International conference
Y. Ishino, M. Tabata, S. Onuma
International Workshop on Environmental Engineering 2019 (IWEE2019) The Japan Society of Mechanical Engineers, Environmental Engineering Division
Event date： 2019.06
Language：English Presentation type：Oral presentation (general)
Venue：Okinawa, Japan
Carbon fiber, contained in CFRP(carbon fiber rainforced plastic), is almost impossible to be burned out by even high temperature burnt gas because of extremely high melting or sublimation point of carbon fiber and a low oxygen concentration in burnt gases. In this study, first, oxygen nozzle of 10 mm x 30 mm exit size, which equipped fuel (propane) pipe of inner diameter of 0.8 mm for a pilot ignition flame, has been introduced to observe the in-oxygen-combustion behaiviors of test pieces of (i) CFRP slender plate (2 mm wide and 1 mm thickness), (ii)slender plate of CFRP-P (Plastic removed CFRP), "G"FCRs("Graphite" Fine Cylindrical Rod) of diameters of 0.38 mm, 0.55 mm and 0.72 mm.
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Application of Thermal Haptics to Tele-Existence Haptics Robot Arm for Remote Thermal Environments
Toshiyuki TSURUYA, Koki OUCHI, Yojiro ISHINO
Event date： 2019.06
Language：Japanese Presentation type：Poster presentation
Robot systems capable of experiencing remote environments are urgently required for future lack of manpower and aging society. In this study, development of the tele-existence robot arm in which human beings can experience not only the haptic environment but also the thermal environment was targeted. In this report, first, a tele-haptics robot arm system, driven by torque control, was introduced. Silicon rubber is used for the fingers of the robot arm because its thermal conductivity is close to that of human skin. In order to investigate the temperature rise caused by contact with a heating body, thermocouples were embedded at the depths of 0.3, 0.6 and 0.9 mm of the silicone rubber finger tips. Temperature measurement was carried out when a high temperature aluminum cylinder of 60 deg.C was touched with a heavy force of 7.8 N and a light force of 0.86 N. The results was compared with numerical simulated results.
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CT (COMPUTER TOMOGRAPHY) MEASUREMENT OF 3D DENSITY DISTRIBUTIONS OF FLAME: OBTAINING VERTICAL GRADIENT SCHLIEREN BRIGHTNESS FROM HORIZONTAL GRADIENT FOR IMAGE-NOISE REDUCTION International conference
Ahmad Z. Nazari, Yojiro Ishino, Ryoya Yamada, Takanori Motohiro, Fumiya Ito, Harumi Kondo, Yoshiaki Miyazato, Shinichiro Nakao
4th Thermal and Fluids Engineering Conference (TFEC) American Society of Thermal and Fluids Engineers
Event date： 2019.04
Language：English Presentation type：Oral presentation (general)
Venue：LasVegas, NV, USA
Using a delicate multi-directional quantitative schlieren optical system, the 20-directional observation of high-speed premixed turbulent flame, non-uniform density flow, by employing non-scanning 3D-CT (three-dimensional computer-tomography) technique has been conducted. The 3D density distributions data of target flame by using ML-EM (Maximum Likelihood-Expectation Maximization) an appropriate CT (computer-tomography) algorithm are successfully reconstructed. In the previous report, a novel technique "multi-path integration" is proposed for noise reduction in projections (density thickness) images of CT (computer-tomography). Multi-path integration is required schlieren brightness gradient in both horizontal (x-directional) and vertical (z-directional) directions, or in other words, in two orthogonal directions (e.g. horizontal and vertical or two perpendicular diagonal directions). The 20-directional quantitative schlieren optical system presents only images of schlieren brightness in the horizontal gradient (x-directional) and another 20-directional optical system seems necessary to obtain vertical (z-directional) schlieren brightness gradient, simultaneously. In the present investigation, the report deals with introducing a new technique for obtaining vertical schlieren brightness gradient from horizontal experimental data without the necessity of a new optical system. This new approach is a simple and inexpensive solution. First, for a deep understanding of complex schlieren brightness, a numerical simulation is performed. Next, the initial density thickness (Dt) images are obtained from images of schlieren brightness in the horizontal gradient (x-directional). Finally, using inverse process from density thickness (Dt) images, the vertical (z-directional) and diagonal schlieren brightness gradient data of target flame successfully obtained. The mentioned technique can be used for obtaining any optional directions of schlieren brightness gradient.
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ウエアラブル＆ロボットアームで遠隔地の温・触覚環境を体験！ Invited
石野 洋二郎，大内 洸輝，鶴谷 敏之
ロボットシンポジウム2019名古屋 ロボットシンポジウム2019名古屋実行委員会
Event date： 2019.02
Language：Japanese Presentation type：Poster presentation
Venue：名古屋市，吹上ホール
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複数燃料種が混在する予混合気体場の当量比分布の定量シュリーレン瞬間三次元CT計測- 当量比・屈折率の普遍関係式に基づく当量比計測 -
石野洋二郎，近藤晴海，元廣孝徳，Ahmad Zaid NAZARI，山田凌矢，伊東郁哉
第56回燃焼シンポジウム 日本燃焼学会
Event date： 2018.11
Language：Japanese Presentation type：Poster presentation
Venue：堺市産業振興センター
「当量比」は，各種燃料と酸化剤（空気）との混合割合を与える値であり，燃焼にとって，適正混合・燃料過剰・空気過剰などの状態を表現する，極めて重要なパラメーターである．
本研究では，この「当量比」に注目し，「複数種の燃料が混在する予混合気体場の当量比分布」を計測する手法を提案する．さらに，この提案を，「定量シュリーレン三次元CT計測法」[1,，2]に適用し，当該予混合気が存在する流れ場の瞬間三次元当量比分布の計測を試みる． -
CFRP（炭素繊維強化プラスチック）の焼却処理に関する研究- ナノレベル先鋭化燃焼過程と電子顕微鏡観察 -
石野洋二郎，田畑まどか，當山良太
第56回燃焼シンポジウム 日本燃焼学会
Event date： 2018.11
Language：Japanese Presentation type：Poster presentation
Venue：堺市産業振興センター
炭素繊維強化プラスチック（CFRP）の今後の利用量の増大に備え，難燃性CFRPの最終焼却処分方法について検討する必要がある．前報[1]では，CFRP，とくに炭素繊維CFが，3000℃を超える高温燃焼ガスであっても全く燃焼しないこと，しかし，酸素流領域では極めて明瞭に燃焼することが確認され，温度条件よりはむしろ，高濃度酸素条件がCFRPの燃焼・焼却に有効であることを示した．本報では，はじめに前報[1]の結果（CFRP-P（後述）および"G"FCRの酸素燃焼実験）を記載する．本報ではさらに，"G"FCR周囲の燃焼ガス流動の観察，"G"FCR表面の赤熱状況撮影および赤熱画像のRGB分解を行った．
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成分不明な複数種類の燃料が混在する予混合気体場での当量比分布の新計測法の提案
石野洋二郎，近藤晴海，元廣孝徳
名工大テクノフェア2018 名古屋工業大学
Event date： 2018.11
Language：Japanese Presentation type：Poster presentation
Venue：名古屋工業大学
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遠隔地の温・触覚環境を体験するサーマルハプティクス（熱触覚技術）ロボットアームの開発と体験展示
石野洋二郎，大内洸輝，鶴谷敏之
名工大テクノフェア2018 名古屋工業大学
Event date： 2018.11
Language：Japanese Presentation type：Poster presentation
Venue：名古屋工業大学
力触覚環境だけでなく，「熱触覚環境」，すなわち，火炎や熱風などによる「流動熱環境」や，高温物体との接触にともなう「接触熱環境(*)」をヒトが体験できるロボットアームの開発を目指して，実機を試作した．
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CFRP（炭素繊維強化プラスチック）の焼却処理に関する研究（燃焼過程と燃焼物形状）
石野洋二郎，田畑まどか，當山良太
日本機械学会 2018年度年次大会 日本機械学会
Event date： 2018.09
Language：Japanese Presentation type：Oral presentation (general)
Venue：関西大学 千里山キャンパス
炭素繊維強化プラスチック（CFRP）は軽量かつ高強度のため，航空機や自動車などに多用されており，今後の利用量の増大に備え，難燃性CFRPの最終焼却処分方法について検討する必要がある．本研究（１）では，CFRP，とくに炭素繊維CFが，3000℃を超える高温燃焼ガスであっても全く燃焼しないこと，しかし，酸素流領域では極めて明瞭に燃焼・焼却することが確認され，温度条件よりはむしろ，高濃度酸素条件がCFRPの燃焼・焼却に有効であることを示した．本報では，はじめに前報（１）の結果，すなわち，試験片としてプラスチック成分を燃焼除去したCFRP（CFRP-Pと記載）の細板と，構造がより単純なグラファイト細径円柱（"G"FCR : "Graphite" Fine Cylindrical Rod，シャープペンシル替芯（太さ0.3, 0.5, 0.7 mm））とを使用し，酸素燃焼実験を行った結果を記載する．"G"FCRの燃焼特性の理解ならびに解析手法は，CFRPの燃焼解析の際に利用できるので，本報ではさらに，"G"FCR周囲の燃焼ガス流動の観察，"G"FCR表面の赤熱状況撮影および赤熱画像のRGB分解を行った．
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定量シュリーレン三次元CT計測における進展（当量比の計測と複素シュリーレン法によるノイズリダクション）
山田凌矢，アハマド・ザイード・ナザリ，元廣孝徳，伊東郁哉，近藤晴海，石野洋二郎，宮里義昭，仲尾晋一郎
日本機械学会 2018年度年次大会 日本機械学会
Event date： 2018.09
Language：Japanese Presentation type：Oral presentation (general)
Venue：関西大学 千里山キャンパス
本研究では，密度変化を伴った流体現象に対して多方向からの定量シュリーレン同時撮影を実施し，得られたシュリーレン画像を用いて三次元データを得る計測法(1-2)を提案した．この計測法を「成分不明な複数種類の燃料が混在する予混合気の当量比」の計測に用いて，当該予混合気が存在する流れ場の瞬間三次元当量比分布の計測を試みた．また，CT再構成精度の向上の為，画像解析を行う前にノイズの低減（ノイズリダクション）を目的とした画像処理が必要であると考えられる．そこで，従来のシュリーレン画像を拡張した「複素シュリーレン画像」という概念を導入し，その特性を用いた新しいノイズリダクション技術を提案する．
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Development of a Thermo-Fluid Haptics Tele-Existence Robot Arm for Remote Thermal Environments
Event date： 2018.07
Language：Japanese Presentation type：Oral presentation (general)
Robot systems capable of experiencing remote environments are urgently required for future lack of manpower and aging society. In this study, development of the tele-existence robot arm in which human beings can experience not only the haptic environment but also the thermal environment was targeted. Silicon rubber is used for the fingers of the robot arm because its thermal conductivity is close to that of human skin. In order to investigate the temperature rise caused by contact with a heating body, thermocouples were embedded at the depths of 0.3, 0.6 and 0.9 mm of the silicone rubber finger tips. Temperature measurement was carried out when a high temperature aluminum cylinder of 60 deg.C was touched with a heavy force of 7.8 N and a light force of 0.86 N. The results was compared with numerical simulated results.
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CFRP（炭素繊維強化プラスチック）の焼却処理に関する研究（燃焼過程の詳細観察）
石野洋二郎，田畑まどか，當山良太
第28回環境工学総合シンポジウム2018 日本機械学会
Event date： 2018.07
Language：Japanese Presentation type：Oral presentation (general)
Venue：早稲田大学
炭素繊維強化プラスチック（CFRP）は軽量かつ高強度のため，航空機や自動車などに多用されており，今後の利用量の増大に備え，難燃性CFRPの最終焼却処分方法について検討する必要がある．本研究（１）では，CFRP，とくに炭素繊維CFが，3000℃を超える高温燃焼ガスであっても全く燃焼しないこと，しかし，酸素流領域では極めて明瞭に燃焼・焼却することが確認され，温度条件よりはむしろ，高濃度酸素条件がCFRPの燃焼・焼却に有効であることを示した．本報では，はじめに前報（１）の結果，すなわち，試験片としてプラスチック成分を燃焼除去したCFRP（CFRP-Pと記載）の細板と，構造がより単純なグラファイト細径円柱（"G"FCR : "Graphite" Fine Cylindrical Rod，シャープペンシル替芯（太さ0.3, 0.5, 0.7 mm））とを使用し，酸素燃焼実験を行った結果を記載する．"G"FCRの燃焼特性の理解ならびに解析手法は，CFRPの燃焼解析の際に利用できるので，本報ではさらに，"G"FCR周囲の燃焼ガス流動の観察，"G"FCR表面の赤熱状況撮影および赤熱画像のRGB分解を行った．
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Schlieren 3D-CT Measurement of Instantaneous Equivalence Ratio Distribution of Premixed Gas Field with Multiple Unknown Fuels
Event date： 2018.07
Language：Japanese Presentation type：Oral presentation (general)
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CT ( COMPUTER TOMOGRAPHY ) MEASUREMENT OF 3D DENSITY DISTRIBUTIONS OF HIGH-SPEED PREMIXED TURBULENT FLAMES ( MULTI-PATH INTEGRATION IMAGE-NOISE REDUCTION TECHNIQUE BASED ON NOVEL CONCEPT OF COMPLEX BRIGHTNESS GRADIENT IN QUANTITATIVE SCHLIEREN IMAGES ) International conference
A. Z. Nazari, Y. Ishino, R. Yamada, T. Motohiro, F. Ito, H. Kondo, Y. Miyazato, S. Nakao
18th International Symposium on Flow Visualization
Event date： 2018.06
Language：English Presentation type：Oral presentation (general)
Venue：Zurich, Switzerland
The 20-directional observation of high-speed premixed turbulent flames, non-uniform density flow, by employing non-scanning 3D-CT (three-dimensional computer-tomography) technique using a delicate multi-directional quantitative schlieren system has been conducted. The 3D density distributions data of target flames by using ML-EM (Maximum Likelihood-Expectation Maximization) an appropriate CT algorithm are successfully reconstructed. First, the report deals with introducing a new approach for noise reduction in projections (density thickness) images of CT called "multi-path integration" novel technique. The numerical simulation results approve that the new approach is a good technique for noise reduction in projections images of CT. Next, by using inverse process for 3D density distributions data of high speed turbulent flame the 20-directional horizontal (x-directional) and vertical (z-directional) brightness gradient of schlieren images reconstructed. Then, by employing the new technique, the new set of projections images of density thickness successfully obtained. Finally, by using the new set of density thickness images "with decreased noise" as projections for CT reconstruction, the 3D density distributions data of target flame successfully reconstructed. The results validate that the "multi-directional integration" novel technique is a good technique for noise reduction in obtaining projections (density thickness) images of CT and the 3D density distributions of CT result.
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Schlieren CT Measurement of 3D Density Distributions of Flame Kernels of Spark-Ignited Direct-Injection of Free, Cavity-Guided and Plane-Guided Fuel Jets International conference
Ahmad Zaid Nazari, Yojiro Ishino, Takanori Motohiro, Ryoya Yamada, Yuta Ishiko, Yu Saiki
11th Asia-Pacific Conference on Combustion
Event date： 2017.12
Language：English Presentation type：Oral presentation (general)
Venue：The University of Sydney, NSW Australia
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COMPUTER FLOW VISUALIZATION OF UNDEREXPANDED JETS FROM AXISYMMETRIC SUPERSONIC MICRO NOZZLES International conference
H. FUKUDA, H. MAEDA, D. ONO, S. NAKAO, Y. MIYAZATO, Y. ISHINO
11th Pacific Symposium on Flow Visualization and Image Processing
Event date： 2017.12
Language：English Presentation type：Oral presentation (general)
Venue：Kumamoto
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Rainbow schlieren measurements in underexpanded jets from square supersonic micro nozzles International conference
Hiroaki Maeda, Hikaru Fukuda, Shinichiro Nakao, Yoshiaki Miyazato, Yojiro Ishino
Experimental fluid mechanics 2017
Event date： 2017.11
Language：English Presentation type：Oral presentation (general)
Venue：Mikulov (Czech Republic)
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Study of Fee Jets from Axisymmetric Supersonic Micro Nozzles (Part 1, Quantitative Flow Visualization) International conference
Hikaru Fukuda, Shinichiro Nakao, Yoshiaki Miyazato, Yojiro Ishino
14th International Conference on Flow Dynamics
Event date： 2017.11
Language：English Presentation type：Oral presentation (general)
Venue：Sendai
