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Proceedings Papers

Effects of the Shape Modification of the Leading Edge Impingement Cooling for Turbine Blade

Kozo Nita, Shu Fujimoto, Masaya Suzuki, Junichi Kazawa, Yoji Okita
Proc. ASME. GT2024, Volume 8: Heat Transfer: Internal Air Systems; Heat Transfer: Internal Cooling; Industrial and Cogeneration, V008T15A021, June 24–28, 2024
Publisher: American Society of Mechanical Engineers
Paper No: GT2024-127420
https://doi.org/10.1115/GT2024-127420
View Paper titled, Effects of the Shape Modification of the Leading Edge Impingement Cooling for Turbine Blade
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Topics: Cooling, Impingement cooling, Shapes, Turbine blades, Computational fluid dynamics, Heat transfer coefficients, Flow (Dynamics), Reynolds number, Temperature, Film cooling
Journal Articles

Aerodynamic Impact of Secondary Air Injection Flowrates on the Main Annulus Flow Field for a Transonic High-Pressure Turbine Stage

Yoji Okita, Junichi Kazawa, Takashi Yamane, Nozomi Tanaka, Kazutaka Fuchigami, Hiroki Sato, Masaaki Hamabe, Haruyuki Tanimitsu
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. December 2024, 146(12): 121007.
Paper No: TURBO-23-1183
https://doi.org/10.1115/1.4065907
Published Online: July 23, 2024
View Article titled, Aerodynamic Impact of Secondary Air Injection Flowrates on the Main Annulus Flow Field for a Transonic High-Pressure Turbine Stage
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Topics: Annulus, Coolants, Design, Flow (Dynamics), Rotors, Turbines, Blades, Vortices, Pressure, Temperature
Proceedings Papers

Aerodynamic Impact of Secondary Air Injection Flowrates on the Main Annulus Flow Field and Performance for a Transonic High-Pressure Turbine Stage

Yoji Okita, Junichi Kazawa, Kazutaka Fuchigami, Takashi Yamane, Nozomi Tanaka, Hiroki Sato, Masaaki Hamabe, Haruyuki Tanimitsu
Proc. ASME. GT2023, Volume 13B: Turbomachinery — Axial Flow Turbine Aerodynamics, V13BT30A007, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-101849
https://doi.org/10.1115/GT2023-101849
View Paper titled, Aerodynamic Impact of Secondary Air Injection Flowrates on the Main Annulus Flow Field and Performance for a Transonic High-Pressure Turbine Stage
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Topics: Annulus, Flow (Dynamics), High pressure (Physics), Turbines, Coolants, Rotors, Airfoils, Disks, Testing, Vortices
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
Publisher: American Society of Mechanical Engineers
Paper No: GT2022-79366
https://doi.org/10.1115/GT2022-79366
View Paper titled, Effect of Temperature and Velocity on Microparticle Erosion/Deposition Into Environmental-Barrier-Coated CMC for Aeroengines
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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
Publisher: ASME
Article Type: Research Papers
J. Turbomach. December 2022, 144(12): 121014.
Paper No: TURBO-22-1150
https://doi.org/10.1115/1.4055388
Published Online: October 3, 2022
View Article titled, Effect of Temperature and Velocity on Microparticle Erosion/Deposition into Environmental-Barrier-Coated Ceramic Matrix Composite for Aeroengines
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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
Publisher: American Society of Mechanical Engineers
Paper No: GT2021-58806
https://doi.org/10.1115/GT2021-58806
View Paper titled, Design and Development of a New Rotating Turbine Research Facility For Investigating the Interaction Between Mainstream and Various Secondary Air at Relevant Engine Conditions
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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
Publisher: American Society of Mechanical Engineers
Paper No: GT2020-14721
https://doi.org/10.1115/GT2020-14721
View Paper titled, Multi-Objective Shape Optimization of Arrowhead-Shaped Film Cooling Hole on Transonic Turbine Blade
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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
Publisher: ASME
Article Type: Research Papers
J. Turbomach. June 2020, 142(6): 061001.
Paper No: TURBO-19-1312
https://doi.org/10.1115/1.4046547
Published Online: May 12, 2020
View Article titled, Erosion Testing of Environmental Barrier-Coated Ceramic Matrix Composite and Its Behavior on an Aero-Engine Turbine Vane Under Particle-Laden Hot Gas Stream
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Topics: Cascades (Fluid dynamics), Erosion, Particulate matter, Turbines, Ceramic matrix composites, Flow (Dynamics), Airfoils, Aircraft engines, Testing, Pressure
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
Publisher: American Society of Mechanical Engineers
Paper No: GT2019-90216
https://doi.org/10.1115/GT2019-90216
View Paper titled, Erosion Testing of Environmental-Barrier-Coated CMC and its Behavior on an Aero-Engine Turbine Vane Under Particle-Laden Hot Gas Stream
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Topics: Aircraft engines, Ceramic matrix composites, Erosion, Particulate matter, Testing, Turbines, Flow (Dynamics), Airfoils, Cascades (Fluid dynamics), 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
Publisher: American Society of Mechanical Engineers
Paper No: GT2019-91228
https://doi.org/10.1115/GT2019-91228
View Paper titled, A Steady State Thermal Prediction Method for Ship Board Turbocharger and its Validation With Experiments
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Topics: Ships, Steady state, Turbochargers, Temperature, Turbines, Wheels, Heat transfer, Fluids, Rotors, Boundary-value problems
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
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. March 2019, 141(3): 031013.
Paper No: GTP-18-1501
https://doi.org/10.1115/1.4041385
Published Online: October 4, 2018
View Article titled, Experimental and Numerical Investigation of Environmental Barrier Coated Ceramic Matrix Composite Turbine Airfoil Erosion
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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
Publisher: American Society of Mechanical Engineers
Paper No: GT2018-75268
https://doi.org/10.1115/GT2018-75268
View Paper titled, Experimental and Numerical Investigation of Environmental Barrier Coated CMC Turbine Airfoil Erosion
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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
Publisher: ASME
Article Type: Research-Article
J. Turbomach. July 2017, 139(7): 071005.
Paper No: TURBO-16-1134
https://doi.org/10.1115/1.4035604
Published Online: February 28, 2017
View Article titled, Aerodynamic Performance of Novel Lightweight Turbine Blade
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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
Publisher: American Society of Mechanical Engineers
Paper No: GT2016-56578
https://doi.org/10.1115/GT2016-56578
View Paper titled, Water-Mist-Cooled Heat Sink for Autonomous Air-Cooling System (AACS) of More Electric Aircraft (MEA)
Open the PDF for Water-Mist-Cooled Heat Sink for Autonomous Air-Cooling System (AACS) of More Electric Aircraft (MEA) in another window
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
Publisher: American Society of Mechanical Engineers
Paper No: GT2016-56516
https://doi.org/10.1115/GT2016-56516
View Paper titled, Aerodynamic Performance of Novel Lightweight Turbine Blade
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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
Publisher: American Society of Mechanical Engineers
Paper No: GT2014-27239
https://doi.org/10.1115/GT2014-27239
View Paper titled, Film Cooling Hole Shape Optimization Using Proper Orthogonal Decomposition
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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
Publisher: American Society of Mechanical Engineers
Paper No: GT2013-95542
https://doi.org/10.1115/GT2013-95542
View Paper titled, Effects of Shape and Arrangement of Dimples on Film Cooling Performance Over Cutback Surface at Airfoil Trailing Edge
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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
Publisher: American Society of Mechanical Engineers
Paper No: GT2012-68217
https://doi.org/10.1115/GT2012-68217
View Paper titled, Experimental and Numerical Studies on Leading Edge Film Cooling Performance: Effects of Hole Exit Shape and Freestream Turbulence
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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
Publisher: American Society of Mechanical Engineers
Paper No: GT2012-69077
https://doi.org/10.1115/GT2012-69077
View Paper titled, Experimental Study on Racetrack-Shaped Holes Impingement Cooling With Bump Type Roughening Element
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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
Publisher: ASME
Article Type: Research Papers
J. Turbomach. September 2012, 134(5): 051041.
https://doi.org/10.1115/1.4004757
Published Online: June 5, 2012
View Article titled, Simulations of Multiphase Particle Deposition on a Showerhead With Staggered Film-Cooling Holes
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Topics: Coolants, Cooling, Film cooling, Particulate matter, Temperature, Simulation