ISHINO Yojiro

写真a

Affiliation Department etc.

Department of Electrical and Mechanical Engineering
Department of Electrical and Mechanical Engineering

Title

Professor

Mail Address

E-mail address

Graduating School

  •  
    -
    1987.03

    Nagoya Institute of Technology   Faculty of Engineering   Graduated

Graduate School

  •  
    -
    1992.03

    Nagoya Institute of Technology  Graduate School, Division of Engineering  Doctor's Course  Completed

Degree

  • Nagoya Institute of Technology -  Master (Engineering)

  • Nagoya Institute of Technology -  Doctor (Engineering)

External Career

  • 1993.12
    -
    1994.11

    Leeds university   Dept. of Mechanical Engineering   Researcher  

Academic Society Affiliations

  • 1990.04
    -
    Now

    Combustion Society of Japan

  • 1989.01
    -
    Now

    The Heat Transfer Society of Japan

  • 2003.01
    -
    Now

    The Robotics Society of Japan

  • 2008.08
    -
    Now

    American Institute of Aeronautics and Astronautics

  • 1990.04
    -
    Now

    The Combustion Institute

display all >>

Field of expertise (Grants-in-aid for Scientific Research classification)

  • Thermal engineering

  • Fluid engineering

  • Energy engineering

  • Environmental engineering and reduction of environmental burden

  • Measurement engineering

display all >>

 

Research Career

  • Study onImprovement of Pulse Combustors and regenerative ceramic burners

    (not selected)  

    Project Year:   - 

  • Two Dimensional Measurement of Combustion Field

    (not selected)  

    Project Year:   - 

  • Acoustic Control of Combustion

    (not selected)  

    Project Year:   - 

Papers

  • Multi-Schlieren 3D-CT Measurements of Instantaneous Equivalence Ratio Distributions of a Premixed Gas Field Based on Modified Refractive Index

    NAZARI, Ahmad Zaid, ISHINO, Yojiro, KONDO, Harumi, MOTOHIRO, Takanori, YAMADA, Ryoya and ITO, Fumiya

    Journal of the Combustion Society of Japan ( 日本燃焼学会 )  ( 1910 ) 1 - 9   2020.11  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

    In quantitative measurements and investigations, "equivalence ratio" and "refractive index" are the most significant parameters in combustion flow fields. Experimental and analytical studies were performed to understand the relation between equivalence ratio and refractive index in flow fields. A "universal relationship" between the refractive index of a premixed gas of fuel and air and its equivalence ratio has been established in this study. Through this relationship, we can calculate the equivalence ratio of any premixed gas (except those of light fuels) from its refractive index using a unique coefficient. The uniqueness of the relation coefficient enables us to obtain the equivalence ratio of even a multi-fuel premixed gas from its refractive index. In this study, the novel relationship is applied to a non-scanning 3D-CT (computerized tomography) technique using a multi(20)-directional quantitative schlieren optical system with a flashlight source. Instantaneous equivalence ratio distributions of a dual-fuel premixed gas flow with two jets of ethanol/air and propane/air mixtures are measured by CT-reconstruction. Good agreement was observed between the CT-reconstructed data and the proposed comprehensive relation.

  • Multi-Schlieren CT Measurements of Supersonic Microjets from Circular and Square Micro Nozzles

    Ahmad Zaid Nazari, Yojiro Ishino, Yuta Ishiko, Fumiya Ito, Harumi Kondo, Ryoya Yamada, Takanori Motohiro, Yoshiaki Miyazato, Shinichiro Nakao

    Journal of Flow Control, Measurement & Visualization ( Scientific research publishing )  8   77 - 101   2020.05  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

    Instantaneous three-dimensional (3D) density distributions of a shock-cell structure of perfectly and imperfectly expanded supersonic microjets escaping into an ambient space are measured. For the 3D observation of supersonic microjets, non-scanning 3D computerized tomography (CT) technique using a 20-directional quantitative schlieren optical system with flashlight source is employed for simultaneous schlieren photography. The 3D density distributions data of the microjets are obtained by 3D-CT reconstruction of the projection’s images using maximum likelihood-expectation maximization. Axisymmetric convergent-divergent (Laval) circular and square micro nozzles with operating nozzle pressure ratio 5.0, 4.5, 4.0, 3.67, and 3.5 have been studied. This study examines perfectly expanded, overexpanded, and underexpanded supersonic microjets issued from micro nozzles with fully expanded jet Mach numbers Mj ranging from 1.47 - 1.71, where the design Mach number is Md = 1.5. A complex phenomenon for free square microjets called axis switching is clearly observed with two types “upright” and "diagonal" of “cross-shaped”. The initial axis-switching is 45˚ within the first shock-cell range. In addition, from the symmetry and diagonal views of square microjets for the first shock-cells, two different patterns of shock waves are viewed. The shock-cell spacing and supersonic core length for all nozzle pressure ratios are investigated and reported.

  • Quantitative Schlieren Image-Noise Reduction Using Inverse Process and Multi-Path Integration

    Ahmad Zaid Nazari, Yojiro Ishino, Fumiya Ito, Harumi Kondo, Ryoya Yamada, Takanori Motohiro, Yu Saiki, Yoshiaki Miyazato, Shinichiro Nakao

    Journal of Flow Control, Measurement & Visualization ( Scientific Research Publishing )  8 ( 2 ) 1 - 25   2020.04  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

    This report deals with introducing two new techniques based on a novel concept of complex brightness gradient in quantitative schlieren images, "inverse process" and "multi-path integration" for image-noise reduction. Noise in schlieren images affects the projections (density thickness) images of CT (computerized tomography). One spot noise in the schlieren image appears in a line shape in the density thickness image. Noise effect like an infectious disease spreads from a noisy pixel to the next pixel in the direction of single-path integration. On the one hand, the noise in the schlieren image reduces the quality of the image and quantitative analysis and is undesirable, on the other it is unavoidable. So, the importance of proper noise reduc-tion techniques seems essential and tangible. In the present report, a novel technique "multi-path integration" is proposed for noise reduction in projections images of CT. Multi-path integration is required schlieren brightness gradient in two orthogonal directions. The 20-directional quantitative schlieren optical system presents only images of schlieren brightness in the horizontal gradient and another 20-directional optical system seems necessary to obtain vertical schlieren brightness gradient, simultaneously. Using the "inverse process" a new technique enables us to obtain vertical schlieren brightness gradient from horizontal experimental data without the necessity of a new optical system and can be used for obtaining any optional direc-tions of schlieren brightness gradient. Recently, we presented the "inverse process" technique but in a different way than this time. In previous work, the phan-tom(virtual) data of schlieren images are obtained by the "inverse process" and used to evaluate noise reduction technique while in the new "inverse process" technique actual experimental data is used for reproducing other directions of schlieren brightness gradient.

  • Three-dimensional reconstruction of a microjet with a Mach disk by Mach-Zehnder interferometers

    S. Sugawara, S. Nakao, Y. Miyazato, Y. Ishino and K. Miki

    J. Fluid Mech.   893   A25-1 - A25-26   2020.04  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

  • THREE-DIMENTIONAL MEASUREMENT ON THERMAL STRUCTURE OF SIX CLUSTERED METHANE-AIR DIFFUSION MICROFLAMES

    Yuta Uchida, Harumi Kondo, Zhaojin Diao, Taro Hirasawa, Michael Winter, Yojiro Ishino, Kozo Saito

    Proceedings of The Second Pacific Rim Thermal Engineering Conference ( ASTFE, JSME, KSME )  PRTEC-24221   1 - 5   2019.12  [Refereed]

    Research paper (international conference proceedings)   Multiple Authorship

    The unique and complicated three-dimensional flame structure of clustered six diffusion methane-air microflames was investigated in the present study. The burner consisted of six micro-nozzles for methane with a diameter of 0.23 mm arranged in a circle surrounding a central nozzle for air with a diameter of 0.7 mm. The burner established six interacting microflames under the conditions of methane total flow rate of 20 cm3 / min and air flow rate of 30 cm3 / min. Schlieren CT method was applied to obtain the three-dimensional distribution of modified refractive index inside and outside the flame structure of the clustered diffusion microflames. The correspondence of flame structure to the distribution of the modified refractive index was confirmed.

  • 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)

    Y. Ishino, M. Tabata,S. Onuma

    Proceedings of the International Workshop on Environmental Engineering 2019 (IWEE2019) ( The Japan Society of Mechanical Engineers, Environmental Engineering Division )    1 - 2   2019.06

    Research paper (international conference proceedings)   Multiple Authorship

    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.

  • CT (COMPUTER TOMOGRAPHY) MEASUREMENT OF 3D DENSITY DISTRIBUTIONS OF FLAME: OBTAINING VERTICAL GRADIENT SCHLIEREN BRIGHTNESS FROM HORIZONTAL GRADIENT FOR IMAGE-NOISE REDUCTION

    Ahmad Z. Nazari, Yojiro Ishino, Ryoya Yamada, Takanori Motohiro, Fumiya Ito, Harumi Kondo, Yoshiaki Miyazato, Shinichiro Nakao

    Proceedings of the 4th Thermal and Fluids Engineering Conference (TFEC) ( American Society of Thermal and Fluids Engineers )  TFEC-2019 ( 27746 ) 1 - 10   2019.04  [Refereed]

    Research paper (international conference proceedings)   Multiple Authorship

    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.

  • Characterization of Six Clustered Methane-Air Diffusion Microflames through Spectroscopic and Tomographic Analysis of CH* and C2* Chemiluminescence

    Zhaojin Diao, Michael Winter, Taro Hirasawa, Yuichi Kato, Yojiro Ishino, and Kozo Saito

    Experimental Thermal and Fluid Science ( Elsevior )  102   20 - 27   2018.12

    Research paper (scientific journal)   Multiple Authorship

    The current study presents an emission spectroscopic investigation of clustered microflames established on a burner consisting of six micro fuel nozzles surrounding a center air nozzle which has been designed for flame synthesis and characterization of microflames. We conducted the spectrally resolved measurement of chemiluminescence of C2* and CH* and compared these results to a tomographic method applied to filtered emission measurements of CH* emission which can yield spatially resolved three dimensional mapping of the flame front. The analysis of the spatial distribution of the integrated band emission of C2* and the CH* showed that the emission of both species is generated in the same locations in the flame which are the thin flame sheets shown in the tomography results of CH*. The ratio of the C2* and the CH* emission from the emission spectroscopy measurements was used to determine a local corresponding equivalence ratio through empirically derived correlations for premixed flames reported in literature. The resulting equivalence ratio equals one when the flame zone established at the boundary between fuel and air, indicating that the diffusion dominated flame zones are established. Under certain nozzle pitch and flow rate conditions, the equivalence ratio above the center air nozzle inside the merged flame became significantly greater than one, which indicates a fuel rich premixed type flame zone being established.
    To determine distributions of rotational and vibrational temperatures throughout the entire flame, we used the spectrally resolved emission from C2* and CH*. The temperature associated with vibrational excitation was different for both species but remained constant throughout the entire flame region and was found no representation of the flame temperature but an artifact of the combustion reactions producing the chemiluminescence. The rotational temperature of di-atomic molecules, however, equilibrates rather quickly with the translational temperature and can accurately represent the gas-dynamic temperature of the flame. The temperature distributions found from the two species agreed qualitatively, the CH* temperature was consistently higher than the C2* temperature by about 200 K. Spatial resolution was assigned to the results from the spectroscopic measurements through a comparison with the tomographically analyzed images of the CH* chemiluminescence.

  • 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 )

    A. Z. Nazari, Y. Ishino, R. Yamada, T. Motohiro, F. Ito, H. Kondo, Y. Miyazato, S. Nakao

    18th International Symposium on Flow Visualization   1 ( 1 ) 1 - 13   2018.06  [Refereed]

    Research paper (international conference proceedings)   Multiple Authorship

  • A Novel Rotational Internal Combustion Engine with a Single-Lobe Peritrochoid Rotor (Design Fundamentals and Motoring Test of a Prototype Engine)

    Yojiro ISHINO, Tomoya NIWA

    Transactions of the JSASS/Aerospace Technology Japan   15 (   ) 117 - 126   2018.03  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

    A novel rotational internal combustion engine is invented and investigated as an auxiliary power unit (APU) of aircraft and range extension power unit for electric automobiles. For the intended applications, IC engines are required to have vibration-free characteristics. There are no reciprocating components in the present engine, resulting in vibration-free operation. This engine mainly consists of a rotor casing, a rotor and a crankshaft. The rotor is shaped in a single-lobe peritrochoid (S.L.P.) curve. The rotor is turned using a crankshaft eccentricity e and self-rotation in the counter-direction is achieved using phasing gears. The rotor casing shape has two cavities that define the envelope curve of the rotating single-lobe peritrochoid rotor. The space between the rotor and casing is where the processes for the working gas are performed: intake, compression, ignition, expansion and exhaust. The intake of premixed air/fuel gas and exhaust of burnt gas are controlled by rotary valves installed on the combustion recesses of the rotor-casing. The combustion recesses are equipped with spark-electrodes for ignition. One of the advantages of this engine compared to Wankel rotary engines and a previous engine invented by authors is easy and reliable sealing of the working gas. In this engine configuration, a sealing component is only installed on the waist section of the rotor-casing, instead of complex sealing system used for the rotor in the case of Wankel engines, resulting in higher efficiency by reducing the leakage of working gas.
    In this paper, first the configuration and geometries of this engine are described. Next a prototype engine is introduced and the cyclic behavior of the working process of the engine is explained. The performance of the prototype engine driven by an electric motor is also shown.

display all >>

Review Papers

  • Instantaneous 3D-CT(Computer Tomography) measurements with instantaneous multi-directional photography for unsteady flame/flow phenomena; and 3D printing of 3D reconstructed distributions

    Yojiro Ishino

        1 - 13   2016.11  [Invited]

    Introduction and explanation (others)   Single Author

  • 3D Visualization of unsteady flames by the combined technique of multi-directional simultaneous photography and 3D-Computed Tomography

    Yojiro ISHINO, Yu SAIKI, Yasufumi TOMIDAI, Yuya OKITA

      31 ( 120 ) 9 - 14   2011.01

    Introduction and explanation (international conference proceedings)   Multiple Authorship

Presentations

  • Multi-Directional Schlieren 3D-CT(Computer Tomography) Measurement of Instantaneous Temperature Distributions of Turbulent Flames (Improvement in accuracy with Standard Refractive Index Gas Jets )

    Yojiro Ishino, Tomoya Kunishima, Yuki Mori, Xiangdong Cao,Yuki Matsui

    2021.10  -  2021.10 

  • Temperature Measurement of Self-burning CFRP(Carbon Fiber Rainforced Plastic) in Oxygen (Image Diagnostics of High Surface Temperature with Visible Light Emission)

    Yojiro Ishino, Yumiko Ishihara

    2021.10  -  2021.10 

  • THREE-DIMENTIONAL MEASUREMENT ON THERMAL STRUCTURE OF SIX CLUSTERED METHANE-AIR DIFFUSION MICROFLAMES

    Yuta Uchida, Harumi Kondo, Zhaojin Diao, Taro Hirasawa, Michael Winter, Yojiro Ishino, Kozo Saito

    The Second Pacific Rim Thermal Engineering Conference  (Maui, Hawaii, USA)  2019.12  -  2019.12  ASTFE, JSME, KSME

  • 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

    2019.09  -  2019.09 

  • 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)

    Y. Ishino, M. Tabata, S. Onuma

    International Workshop on Environmental Engineering 2019 (IWEE2019)   (Okinawa, Japan)  2019.06  -  2019.06  The Japan Society of Mechanical Engineers, Environmental Engineering Division

  • Application of Thermal Haptics to Tele-Existence Haptics Robot Arm for Remote Thermal Environments

    Toshiyuki TSURUYA, Koki OUCHI, Yojiro ISHINO

    2019.06  -  2019.06 

  • CT (COMPUTER TOMOGRAPHY) MEASUREMENT OF 3D DENSITY DISTRIBUTIONS OF FLAME: OBTAINING VERTICAL GRADIENT SCHLIEREN BRIGHTNESS FROM HORIZONTAL GRADIENT FOR IMAGE-NOISE REDUCTION

    Ahmad Z. Nazari, Yojiro Ishino, Ryoya Yamada, Takanori Motohiro, Fumiya Ito, Harumi Kondo, Yoshiaki Miyazato, Shinichiro Nakao

    4th Thermal and Fluids Engineering Conference (TFEC)  (LasVegas, NV, USA)  2019.04  -  2019.04  American Society of Thermal and Fluids Engineers

  • Development of a Thermo-Fluid Haptics Tele-Existence Robot Arm for Remote Thermal Environments

    2018.07  -  2018.07 

  • Schlieren 3D-CT Measurement of Instantaneous Equivalence Ratio Distribution of Premixed Gas Field with Multiple Unknown Fuels

    2018.07  -  2018.07 

  • 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 )

    A. Z. Nazari, Y. Ishino, R. Yamada, T. Motohiro, F. Ito, H. Kondo, Y. Miyazato, S. Nakao

    18th International Symposium on Flow Visualization  (Zurich, Switzerland)  2018.06  -  2018.06 

display all >>

Industrial Property

  • Novel Rotational Engine and Compressor without Eccentric nor Reciprocating Motion

    特願 特願2012057992 

    Novel Rotational Engine and Compressor without Eccentric nor Reciprocating Motion

 
 

Academic Activity

  • 2015.04
    -
    Now

    Japan Society for Design Engineering