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Koichi Yonezawa
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Proceedings Papers

The Effect of Partial-Load Operation on a Gas Turbine Compressor of an Advanced Combined Cycle Power Plant

Yasuharu Hagita, Hironori Miyazawa, Takashi Furusawa, Satoru Yamamoto, Koichi Yonezawa, Shuichi Umezawa, Shuichi Ohmori, Takeshi Suzuki
Proc. ASME. GT2022, Volume 10D: Turbomachinery — Multidisciplinary Design Approaches, Optimization, and Uncertainty Quantification; Turbomachinery General Interest; Unsteady Flows in Turbomachinery, V10DT37A006, June 13–17, 2022
Publisher: American Society of Mechanical Engineers
Paper No: GT2022-80251
https://doi.org/10.1115/GT2022-80251
View Paper titled, The Effect of Partial-Load Operation on a Gas Turbine Compressor of an Advanced Combined Cycle Power Plant
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Topics: Combined cycle power stations, Compressors, Gas turbines, Stress, Unsteady flow
Journal Articles

Sloshing of Fluid Between Rotating Inner Vertical Shaft and Stationary Outer Casing

Koichi Yonezawa, Kosuke Nishimura, Takeshi Sano, Kazuyoshi Miyagawa, Yoshinobu Tsujimoto
Journal: Journal of Fluids Engineering
Publisher: ASME
Article Type: Research-Article
J. Fluids Eng. December 2021, 143(12): 121108.
Paper No: FE-21-1172
https://doi.org/10.1115/1.4052127
Published Online: September 13, 2021
View Article titled, Sloshing of Fluid Between Rotating Inner Vertical Shaft and Stationary Outer Casing
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Topics: Fluids, Oscillations, Sloshing, Water
Proceedings Papers

Numerical Study of Influence of Rotor Tip Gap Increase due to Age Deterioration in 3-Stage Gas Turbine

Koichi Yonezawa, Junichi Sakamoto, Kazuyasu Sugiyama, Shuichi Ohmori, Shuichi Umezawa
Proc. ASME. GT2020, Volume 2B: Turbomachinery, V02BT33A034, September 21–25, 2020
Publisher: American Society of Mechanical Engineers
Paper No: GT2020-16270
https://doi.org/10.1115/GT2020-16270
View Paper titled, Numerical Study of Influence of Rotor Tip Gap Increase due to Age Deterioration in 3-Stage Gas Turbine
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Topics: Gas turbines, Rotors, Blades, Clearances (Engineering), Computational fluid dynamics, Simulation, Boundary-value problems, Entropy, Flow (Dynamics), Heat
Proceedings Papers

Unsteady Flow Simulation Through Stator-Rotor Blade Rows in Intermediate-Pressure Steam Turbines With Cutback Blades

Hironori Miyazawa, Akihiro Uemura, Takashi Furusawa, Satoru Yamamoto, Koichi Yonezawa, Shuichi Umezawa, Shuichi Ohmori, Takeshi Suzuki
Proc. ASME. GT2020, Volume 2E: Turbomachinery, V02ET41A018, September 21–25, 2020
Publisher: American Society of Mechanical Engineers
Paper No: GT2020-14937
https://doi.org/10.1115/GT2020-14937
View Paper titled, Unsteady Flow Simulation Through Stator-Rotor Blade Rows in Intermediate-Pressure Steam Turbines With Cutback Blades
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Topics: Blades, Pressure, Rotors, Simulation, Stators, Steam turbines, Unsteady flow, Maintenance, Flow (Dynamics), Fracture (Process)
Journal Articles

Evaluation of a Dynamic Transfer Matrix for a Hydraulic Turbine

Keita Yamamoto, Koichi Yonezawa, Andres Müller, François Avellan, Yoshinobu Tsujimoto
Journal: Journal of Fluids Engineering
Publisher: ASME
Article Type: Research-Article
J. Fluids Eng. April 2020, 142(4): 041204.
Paper No: FE-19-1526
https://doi.org/10.1115/1.4045437
Published Online: January 24, 2020
View Article titled, Evaluation of a Dynamic Transfer Matrix for a Hydraulic Turbine
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Topics: Cavitation, Flow (Dynamics), Pressure, Stress, Hydraulic turbines, Excitation, Stability, Fluctuations (Physics)
Proceedings Papers

An Impact Assessment of Erosion of Nozzle Guide Vanes and Rotor Blades on Aerodynamic Performance of a Gas Turbine by CFD

Koichi Yonezawa, Masahiro Takayasu, Genki Nakai, Kazuyasu Sugiyama, Katsuhiko Sugita, Shuichi Umezawa, Shuichi Ohmori
Proc. ASME. GT2019, Volume 2B: Turbomachinery, V02BT40A013, June 17–21, 2019
Publisher: American Society of Mechanical Engineers
Paper No: GT2019-90636
https://doi.org/10.1115/GT2019-90636
View Paper titled, An Impact Assessment of Erosion of Nozzle Guide Vanes and Rotor Blades on Aerodynamic Performance of a Gas Turbine by CFD
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Topics: Blades, Computational fluid dynamics, Erosion, Gas turbines, Nozzle guide vanes, Rotors, Nozzles, Cycles, Flow (Dynamics), Heat
Proceedings Papers

Effect of Blade Secular Change on Unsteady Flows in Middle Pressure First-Stage Steam Turbines

Akihiro Uemura, Hironori Miyazawa, Takashi Furusawa, Satoru Yamamoto, Koichi Yonezawa, Shuichi Umezawa
Proc. ASME. GT2019, Volume 8: Microturbines, Turbochargers, and Small Turbomachines; Steam Turbines, V008T29A015, June 17–21, 2019
Publisher: American Society of Mechanical Engineers
Paper No: GT2019-90644
https://doi.org/10.1115/GT2019-90644
View Paper titled, Effect of Blade Secular Change on Unsteady Flows in Middle Pressure First-Stage Steam Turbines
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Topics: Blades, Pressure, Steam turbines, Unsteady flow, Maintenance, Rotors, Stators, Accidents, Boilers, Coal
Journal Articles

Degradation of Aerodynamic Performance of an Intermediate-Pressure Steam Turbine Due to Erosion of Nozzle Guide Vanes and Rotor Blades

Koichi Yonezawa, Tomoki Kagayama, Masahiro Takayasu, Genki Nakai, Kazuyasu Sugiyama, Katsuhiko Sugita, Shuichi Umezawa
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. January 2019, 141(1): 012602.
Paper No: GTP-17-1646
https://doi.org/10.1115/1.4040566
Published Online: September 14, 2018
View Article titled, Degradation of Aerodynamic Performance of an Intermediate-Pressure Steam Turbine Due to Erosion of Nozzle Guide Vanes and Rotor Blades
Open the PDF for Degradation of Aerodynamic Performance of an Intermediate-Pressure Steam Turbine Due to Erosion of Nozzle Guide Vanes and Rotor Blades in another window
Topics: Blades, Erosion, Nozzle guide vanes, Pressure, Rotors, Steam turbines, Flow (Dynamics), Turbines
Proceedings Papers

A Numerical Investigation of Aerodynamic Characteristics of a Deteriorated Gas Turbine

Koichi Yonezawa, Genki Nakai, Kazuyasu Sugiyama, Katsuhiko Sugita, Shuichi Umezawa
Proc. ASME. POWER2017-ICOPE-17, Volume 2: I&C, Digital Controls, and Influence of Human Factors; Plant Construction Issues and Supply Chain Management; Plant Operations, Maintenance, Aging Management, Reliability and Performance; Renewable Energy Systems: Solar, Wind, Hydro and Geothermal; Risk Management, Safety and Cyber Security; Steam Turbine-Generators, Electric Generators, Transformers, Switchgear, and Electric BOP and Auxiliaries; Student Competition; Thermal Hydraulics and Computational Fluid Dynamics, V002T08A017, June 26–30, 2017
Publisher: American Society of Mechanical Engineers
Paper No: POWER-ICOPE2017-3444
https://doi.org/10.1115/POWER-ICOPE2017-3444
View Paper titled, A Numerical Investigation of Aerodynamic Characteristics of a Deteriorated Gas Turbine
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Topics: Gas turbines, Blades, Rotors, Nozzle guide vanes, Aerodynamics, Computation, Erosion, Flow (Dynamics), Maintenance, Particulate matter
Journal Articles

Measurement of the Self-Oscillating Vortex Rope Dynamics for Hydroacoustic Stability Analysis

Andres Müller, Keita Yamamoto, Sébastien Alligné, Koichi Yonezawa, Yoshinobu Tsujimoto, François Avellan
Journal: Journal of Fluids Engineering
Publisher: ASME
Article Type: Research-Article
J. Fluids Eng. February 2016, 138(2): 021206.
Paper No: FE-14-1721
https://doi.org/10.1115/1.4031778
Published Online: November 4, 2015
View Article titled, Measurement of the Self-Oscillating Vortex Rope Dynamics for Hydroacoustic Stability Analysis
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Topics: Pressure, Ropes, Stability, Vortices, Cavitation, Fluctuations (Physics), Flow (Dynamics), Flow visualization, Dynamics (Mechanics), Cavities
Proceedings Papers

Experimental and Numerical Investigation of Flow Induced Vibration of Steam Control Valve

Koichi Yonezawa, Kanako Ogi, Tomofumi Takino, Yoshinobu Tsujimoto, Takahide Endo, Kenichi Tezuka, Ryo Morita, Fumio Inada
Proc. ASME. FEDSM2010, ASME 2010 7th International Symposium on Fluid-Structure Interactions, Flow-Sound Interactions, and Flow-Induced Vibration and Noise: Volume 3, Parts A and B, 575-583, August 1–5, 2010
Publisher: American Society of Mechanical Engineers
Paper No: FEDSM-ICNMM2010-30676
https://doi.org/10.1115/FEDSM-ICNMM2010-30676
View Paper titled, Experimental and Numerical Investigation of Flow Induced Vibration of Steam Control Valve
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Topics: Flow-induced vibrations, Steam, Valves, Pressure, Vibration, Damping, Excitation systems, Flow (Dynamics), Engineering simulation, Excitation
Proceedings Papers

One-Dimensional Analysis of Full Load Draft Tube Surge

Changkun Chen, Christophe Nicolet, Koichi Yonezawa, Mohamed Farhat, Francois Avellan, Yoshinobu Tsujimoto
Proc. ASME. FEDSM2007, Volume 2: Fora, Parts A and B, 391-396, July 30–August 2, 2007
Publisher: American Society of Mechanical Engineers
Paper No: FEDSM2007-37304
https://doi.org/10.1115/FEDSM2007-37304
View Paper titled, One-Dimensional Analysis of Full Load Draft Tube Surge
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Topics: Stress, Surges, Flow (Dynamics), Pressure, Diffusers, Cavities, Centrifugal force, Hydraulic drive systems, Stability, Swirling flow
Journal Articles

One-Dimensional Analysis of Full Load Draft Tube Surge

Changkun Chen, Christophe Nicolet, Koichi Yonezawa, Mohamed Farhat, Francois Avellan, Yoshinobu Tsujimoto
Journal: Journal of Fluids Engineering
Publisher: ASME
Article Type: Research Papers
J. Fluids Eng. April 2008, 130(4): 041106.
https://doi.org/10.1115/1.2903475
Published Online: April 14, 2008
View Article titled, One-Dimensional Analysis of Full Load Draft Tube Surge
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Topics: Diffusers, Flow (Dynamics), Stress, Surges, Pressure, Cavities, Hydraulic drive systems, Swirling flow