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Proceedings Papers

Effect of Temperature and Velocity on Microparticle Erosion/Deposition Into Environmental-Barrier-Coated CMC for Aeroengines

Yoji Okita, Masaya Suzuki, Takashi Yamane, Jun Hasegawa, Yosuke Mizokami, Takeshi Nakamura
Proc. ASME. GT2022, Volume 10B: Turbomachinery — Axial Flow Turbine Aerodynamics; Deposition, Erosion, Fouling, and Icing; Radial Turbomachinery Aerodynamics, V10BT31A002, June 13–17, 2022
Paper No: GT2022-79366
DOI: https://doi.org/10.1115/GT2022-79366
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Topics: Ceramic matrix composites, Erosion, Microparticles, Temperature, Damage, Design, Sands, Blasting, Coating processes, Coatings
Journal Articles

Effect of Temperature and Velocity on Microparticle Erosion/Deposition into Environmental-Barrier-Coated Ceramic Matrix Composite for Aeroengines

Yoji Okita, Masaya Suzuki, Takashi Yamane, Jun Hasegawa, Yosuke Mizokami, Takeshi Nakamura
Journal: Journal of Turbomachinery
Article Type: Research Papers
J. Turbomach. December 2022, 144(12): 121014.
Paper No: TURBO-22-1150
DOI: https://doi.org/10.1115/1.4055388
Published Online: October 3, 2022
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Topics: Ceramic matrix composites, Damage, Erosion, Particulate matter, Temperature, Testing, Microparticles
Proceedings Papers

Design and Development of a New Rotating Turbine Research Facility For Investigating the Interaction Between Mainstream and Various Secondary Air at Relevant Engine Conditions

Yoji Okita, Hisao Futamura, Takashi Yamane, Masaya Suzuki, Nozomi Tanaka, Haruyuki Tanimitsu, Junichi Iguchi
Proc. ASME. GT2021, Volume 5B: Heat Transfer — General Interest; Internal Air Systems; Internal Cooling, V05BT13A002, June 7–11, 2021
Paper No: GT2021-58806
DOI: https://doi.org/10.1115/GT2021-58806
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Topics: Design, Engines, Turbines, Cooling, Aerospace industry, Air flow, Aircraft engines, Airfoils, Blades, Compressors
Proceedings Papers

Multi-Objective Shape Optimization of Arrowhead-Shaped Film Cooling Hole on Transonic Turbine Blade

Yoji Okita, Takeomi Ideta, Shu Fujimoto
Proc. ASME. GT2020, Volume 7B: Heat Transfer, V07BT12A026, September 21–25, 2020
Paper No: GT2020-14721
DOI: https://doi.org/10.1115/GT2020-14721
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Topics: Film cooling, Shape optimization, Turbine blades, Design, Optimization, Shapes, Airfoils, Cascades (Fluid dynamics), Coolants, Heat transfer
Journal Articles

Erosion Testing of Environmental Barrier-Coated Ceramic Matrix Composite and Its Behavior on an Aero-Engine Turbine Vane Under Particle-Laden Hot Gas Stream

Yoji Okita, Yosuke Mizokami, Jun Hasegawa
Journal: Journal of Turbomachinery
Article Type: Research Papers
J. Turbomach. June 2020, 142(6): 061001.
Paper No: TURBO-19-1312
DOI: https://doi.org/10.1115/1.4046547
Published Online: May 12, 2020
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Topics: Cascades (Fluid dynamics), Erosion, Particulate matter, Turbines, Ceramic matrix composites, Flow (Dynamics), Airfoils, Aircraft engines, Testing, Pressure
Proceedings Papers

A Steady State Thermal Prediction Method for Ship Board Turbocharger and its Validation With Experiments

Satoshi Ohuchida, Satoshi Seo, Yoji Okita
Proc. ASME. GT2019, Volume 5A: Heat Transfer, V05AT10A009, June 17–21, 2019
Paper No: GT2019-91228
DOI: https://doi.org/10.1115/GT2019-91228
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Topics: Ships, Steady state, Turbochargers, Temperature, Turbines, Wheels, Heat transfer, Fluids, Rotors, Boundary-value problems
Proceedings Papers

Erosion Testing of Environmental-Barrier-Coated CMC and its Behavior on an Aero-Engine Turbine Vane Under Particle-Laden Hot Gas Stream

Yoji Okita, Yousuke Mizokami, Jun Hasegawa
Proc. ASME. GT2019, Volume 2D: Turbomachinery, V02DT47A002, June 17–21, 2019
Paper No: GT2019-90216
DOI: https://doi.org/10.1115/GT2019-90216
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Topics: Aircraft engines, Ceramic matrix composites, Erosion, Particulate matter, Testing, Turbines, Flow (Dynamics), Airfoils, Cascades (Fluid dynamics), Pressure
Journal Articles

Experimental and Numerical Investigation of Environmental Barrier Coated Ceramic Matrix Composite Turbine Airfoil Erosion

Yoji Okita, Yousuke Mizokami, Jun Hasegawa
Journal: Journal of Engineering for Gas Turbines and Power
Article Type: Research-Article
J. Eng. Gas Turbines Power. March 2019, 141(3): 031013.
Paper No: GTP-18-1501
DOI: https://doi.org/10.1115/1.4041385
Published Online: October 4, 2018
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Topics: Airfoils, Ceramic matrix composites, Erosion, Flow (Dynamics), Particulate matter, Turbines, Cascades (Fluid dynamics), Temperature
Proceedings Papers

Experimental and Numerical Investigation of Environmental Barrier Coated CMC Turbine Airfoil Erosion

Yoji Okita, Yousuke Mizokami, Jun Hasegawa
Proc. ASME. GT2018, Volume 2D: Turbomachinery, V02DT47A003, June 11–15, 2018
Paper No: GT2018-75268
DOI: https://doi.org/10.1115/GT2018-75268
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Topics: Airfoils, Ceramic matrix composites, Erosion, Turbines, Particulate matter, Temperature, Numerical analysis, Aircraft engines, Alloys, Brittleness
Journal Articles

Aerodynamic Performance of Novel Lightweight Turbine Blade

Yoji Okita, Kozo Nita, Seiji Kubo
Journal: Journal of Turbomachinery
Article Type: Research-Article
J. Turbomach. July 2017, 139(7): 071005.
Paper No: TURBO-16-1134
DOI: https://doi.org/10.1115/1.4035604
Published Online: February 28, 2017
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Topics: Airfoils, Blades, Cascades (Fluid dynamics), Design, Flow (Dynamics), Mach number, Optimization, Pressure, Turbine blades, Weight (Mass)
Proceedings Papers

Water-Mist-Cooled Heat Sink for Autonomous Air-Cooling System (AACS) of More Electric Aircraft (MEA)

Akira Murata, Hiroshi Saito, Yoji Okita
Proc. ASME. GT2016, Volume 5A: Heat Transfer, V05AT13A006, June 13–17, 2016
Paper No: GT2016-56578
DOI: https://doi.org/10.1115/GT2016-56578
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Topics: Aircraft, Cooling, Heat sinks, Water, Engines, Motors, Control equipment, Electronics, Geometry, Heat
Proceedings Papers

Aerodynamic Performance of Novel Lightweight Turbine Blade

Yoji Okita, Kozo Nita, Seiji Kubo
Proc. ASME. GT2016, Volume 2B: Turbomachinery, V02BT38A020, June 13–17, 2016
Paper No: GT2016-56516
DOI: https://doi.org/10.1115/GT2016-56516
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Topics: Turbine blades, Airfoils, Design, Pressure, Cascades (Fluid dynamics), Shapes, Mach number, Weight (Mass), Geometry, Blades
Proceedings Papers

Film Cooling Hole Shape Optimization Using Proper Orthogonal Decomposition

Kozo Nita, Yoji Okita, Chiyuki Nakamata, Seiji Kubo, Kazuo Yonekura, Osamu Watanabe
Proc. ASME. GT2014, Volume 2B: Turbomachinery, V02BT39A046, June 16–20, 2014
Paper No: GT2014-27239
DOI: https://doi.org/10.1115/GT2014-27239
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Topics: Film cooling, Principal component analysis, Shape optimization, Shapes, Optimization, Computation, Computational fluid dynamics, Cooling, Design, Heat
Proceedings Papers

Effects of Shape and Arrangement of Dimples on Film Cooling Performance Over Cutback Surface at Airfoil Trailing Edge

Satomi Nishida, Akira Murata, Hiroshi Saito, Yoji Okita, Chiyuki Nakamata, Kaoru Iwamoto
Proc. ASME. GT2013, Volume 3B: Heat Transfer, V03BT13A054, June 3–7, 2013
Paper No: GT2013-95542
DOI: https://doi.org/10.1115/GT2013-95542
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Topics: Airfoils, Film cooling, Shapes, Heat transfer, Cooling, Heat transfer coefficients, Blades, Gas turbines, Heat, Reynolds number
Proceedings Papers

Experimental and Numerical Studies on Leading Edge Film Cooling Performance: Effects of Hole Exit Shape and Freestream Turbulence

Ken-ichi Funazaki, Hirokazu Kawabata, Daichi Takahashi, Yoji Okita
Proc. ASME. GT2012, Volume 4: Heat Transfer, Parts A and B, 1223-1233, June 11–15, 2012
Paper No: GT2012-68217
DOI: https://doi.org/10.1115/GT2012-68217
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Topics: Film cooling, Shapes, Turbulence, Diffusers, Pressure, Simulation, Computational fluid dynamics, Eddies (Fluid dynamics), Flow (Dynamics), Heat transfer coefficients
Proceedings Papers

Experimental Study on Racetrack-Shaped Holes Impingement Cooling With Bump Type Roughening Element

Chiyuki Nakamata, Yoji Okita, Takashi Yamane, Yoshitaka Fukuyama, Toyoaki Yoshida
Proc. ASME. GT2012, Volume 4: Heat Transfer, Parts A and B, 425-434, June 11–15, 2012
Paper No: GT2012-69077
DOI: https://doi.org/10.1115/GT2012-69077
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Topics: Impingement cooling, Cooling, Reynolds number, Flow (Dynamics)
Journal Articles

Simulations of Multiphase Particle Deposition on a Showerhead With Staggered Film-Cooling Holes

Seth A. Lawson, Karen A. Thole, Yoji Okita, Chiyuki Nakamata
Journal: Journal of Turbomachinery
Article Type: Research Papers
J. Turbomach. September 2012, 134(5): 051041.
DOI: https://doi.org/10.1115/1.4004757
Published Online: June 5, 2012
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Topics: Coolants, Cooling, Film cooling, Particulate matter, Temperature, Simulation
Journal Articles

Effects of Surface Geometry on Film Cooling Performance at Airfoil Trailing Edge

Akira Murata, Satomi Nishida, Hiroshi Saito, Kaoru Iwamoto, Yoji Okita, Chiyuki Nakamata
Journal: Journal of Turbomachinery
Article Type: Research Papers
J. Turbomach. September 2012, 134(5): 051033.
DOI: https://doi.org/10.1115/1.4004828
Published Online: May 31, 2012
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Topics: Airfoils, Cooling, Film cooling, Flow (Dynamics), Geometry, Heat transfer coefficients, Transients (Dynamics), Diffusers
Proceedings Papers

Simulations of Multi-Phase Particle Deposition on a Showerhead With Staggered Film-Cooling Holes

Seth A. Lawson, Karen A. Thole, Yoji Okita, Chiyuki Nakamata
Proc. ASME. GT2011, Volume 5: Heat Transfer, Parts A and B, 91-103, June 6–10, 2011
Paper No: GT2011-45191
DOI: https://doi.org/10.1115/GT2011-45191
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Topics: Engineering simulation, Film cooling, Particulate matter, Simulation, Cooling, Temperature, Turbines, Combustion, Coolants, Gas turbines
Proceedings Papers

Effects of Surface Geometry on Film Cooling Performance at Airfoil Trailing Edge

Akira Murata, Satomi Nishida, Hiroshi Saito, Kaoru Iwamoto, Yoji Okita, Chiyuki Nakamata
Proc. ASME. GT2011, Volume 5: Heat Transfer, Parts A and B, 171-181, June 6–10, 2011
Paper No: GT2011-45355
DOI: https://doi.org/10.1115/GT2011-45355
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Topics: Airfoils, Film cooling, Geometry, Heat transfer coefficients, Heat transfer, Cooling, Diffusers, Flow (Dynamics), Gas turbines, Pressure