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Proceedings Papers

A Study of Unsteady Aerodynamic Forces on Last Stage Blades in a Low-Pressure Model Steam Turbine at Very Low Operating Conditions

Tadashi Tanuma, Hiroshi Okuda, Taiga Haraguchi, Kenichi Okuno, Naoki Shibukawa
Proc. ASME. GT2023, Volume 10: Steam Turbine, V010T20A003, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-101083
https://doi.org/10.1115/GT2023-101083
View Paper titled, A Study of Unsteady Aerodynamic Forces on Last Stage Blades in a Low-Pressure Model Steam Turbine at Very Low Operating Conditions
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Topics: Aerodynamics, Blades, Computational fluid dynamics, Finite element analysis, Fluid-dynamic forces, Pressure, Steam turbines, Structural analysis, Structural mechanics
Proceedings Papers

Unsteady Flow Effects on Steam Turbine Last Stage Blades at Very Low Load Operating Condition

Tadashi Tanuma, Michio Ogawa, Hiroshi Okuda, Gaku Hashimoto, Naoki Shibukawa, Kenichi Okuno, Tomohiko Tsukuda
Proc. ASME. GT2018, Volume 8: Microturbines, Turbochargers, and Small Turbomachines; Steam Turbines, V008T29A028, June 11–15, 2018
Publisher: American Society of Mechanical Engineers
Paper No: GT2018-76498
https://doi.org/10.1115/GT2018-76498
View Paper titled, Unsteady Flow Effects on Steam Turbine Last Stage Blades at Very Low Load Operating Condition
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Topics: Blades, Steam turbines, Stress, Unsteady flow, Structural analysis, Boundary-value problems, Annulus, Design, Pressure, Vibration
Proceedings Papers

Effects of Upstream Sprayed Water on Steam Flow Conditions and Blade Vibrations of a Low Pressure Steam Turbine

Naoki Shibukawa, Yoshihiro Ishikawa, Yoshifumi Iwasaki, Kota Chiba
Proc. ASME. GT2016, Volume 8: Microturbines, Turbochargers and Small Turbomachines; Steam Turbines, V008T26A043, June 13–17, 2016
Publisher: American Society of Mechanical Engineers
Paper No: GT2016-57954
https://doi.org/10.1115/GT2016-57954
View Paper titled, Effects of Upstream Sprayed Water on Steam Flow Conditions and Blade Vibrations of a Low Pressure Steam Turbine
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Topics: Blades, Flow (Dynamics), Pressure, Steam, Steam turbines, Vibration, Water, Stress, Turbines, Flashing
Proceedings Papers

Aerodynamic and Structural Numerical Investigation of Unsteady Flow Effects on Last Stage Blades

Tadashi Tanuma, Hiroshi Okuda, Gaku Hashimoto, Satoru Yamamoto, Naoki Shibukawa, Kenichi Okuno, Hiroshi Saeki, Tomohiko Tsukuda
Proc. ASME. GT2015, Volume 8: Microturbines, Turbochargers and Small Turbomachines; Steam Turbines, V008T26A035, June 15–19, 2015
Publisher: American Society of Mechanical Engineers
Paper No: GT2015-43848
https://doi.org/10.1115/GT2015-43848
View Paper titled, Aerodynamic and Structural Numerical Investigation of Unsteady Flow Effects on Last Stage Blades
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Topics: Blades, Unsteady flow, Rotating blades, Diffusers, Exhaust systems, Pressure, Boundary-value problems, Finite element analysis, Flow (Dynamics), Steam turbines
Journal Articles

An Experimental Investigation of the Influence of Flash-Back Flow on Last Three Stages of Low Pressure Steam Turbines

Naoki Shibukawa, Takao Fukushima, Yoshifumi Iwasaki, Yoshiaki Takada, Itaru Murakami, Takashi Suzuki
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. May 2015, 137(5): 052601.
Paper No: GTP-14-1394
https://doi.org/10.1115/1.4028674
Published Online: May 1, 2015
View Article titled, An Experimental Investigation of the Influence of Flash-Back Flow on Last Three Stages of Low Pressure Steam Turbines
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Topics: Blades, Drops, Flow (Dynamics), Pressure, Steam, Stress, Vibration, Water, Turbines, Steam turbines
Proceedings Papers

An Experimental Investigation of Thermal Wetness Loss in the Full Scale Size Low Pressure Turbine

Tomohiko Tsukuda, Hiroki Sato, Daisuke Nomura, Sakae Kawasaki, Naoki Shibukawa
Proc. ASME. GT2014, Volume 1B: Marine; Microturbines, Turbochargers and Small Turbomachines; Steam Turbines, V01BT27A027, June 16–20, 2014
Publisher: American Society of Mechanical Engineers
Paper No: GT2014-26012
https://doi.org/10.1115/GT2014-26012
View Paper titled, An Experimental Investigation of Thermal Wetness Loss in the Full Scale Size Low Pressure Turbine
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Topics: Pressure, Turbines, Equilibrium (Physics), Condensation, Superheating, Temperature, Enthalpy, Flow (Dynamics), Probes, Supercooling
Proceedings Papers

An Experimental Investigation of the Influence of Flash-Back Flow on Last Three Stages of Low Pressure Steam Turbines

Naoki Shibukawa, Yoshifumi Iwasaki, Yoshiaki Takada, Itaru Murakami, Takashi Suzuki, Takao Fukushima
Proc. ASME. GT2014, Volume 1B: Marine; Microturbines, Turbochargers and Small Turbomachines; Steam Turbines, V01BT27A047, June 16–20, 2014
Publisher: American Society of Mechanical Engineers
Paper No: GT2014-26897
https://doi.org/10.1115/GT2014-26897
View Paper titled, An Experimental Investigation of the Influence of Flash-Back Flow on Last Three Stages of Low Pressure Steam Turbines
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Topics: Flow (Dynamics), Pressure, Steam turbines, Blades, Stress, Vibration, Flashing, Steam, Turbines, Water
Proceedings Papers

Numerical Investigation of Steam Turbine Exhaust Diffuser Flows and Their Three Dimensional Interaction Effects on Last Stage Efficiencies

Tadashi Tanuma, Yasuhiro Sasao, Satoru Yamamoto, Yoshiki Niizeki, Naoki Shibukawa, Hiroshi Saeki
Proc. ASME. GT2014, Volume 1B: Marine; Microturbines, Turbochargers and Small Turbomachines; Steam Turbines, V01BT27A039, June 16–20, 2014
Publisher: American Society of Mechanical Engineers
Paper No: GT2014-26665
https://doi.org/10.1115/GT2014-26665
View Paper titled, Numerical Investigation of Steam Turbine Exhaust Diffuser Flows and Their Three Dimensional Interaction Effects on Last Stage Efficiencies
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Topics: Diffusers, Exhaust systems, Flow (Dynamics), Steam turbines, Design, Numerical analysis, Pressure, Blades, Design engineering, Energy generation
Proceedings Papers

Aerodynamic Interaction Effects From Upstream and Downstream on the Down-Flow Type Exhaust Diffuser Performance in a Low Pressure Steam Turbine

Tadashi Tanuma, Yasuhiro Sasao, Satoru Yamamoto, Yoshiki Niizeki, Naoki Shibukawa, Hiroshi Saeki
Proc. ASME. GT2013, Volume 5B: Oil and Gas Applications; Steam Turbines, V05BT25A044, June 3–7, 2013
Publisher: American Society of Mechanical Engineers
Paper No: GT2013-95901
https://doi.org/10.1115/GT2013-95901
View Paper titled, Aerodynamic Interaction Effects From Upstream and Downstream on the Down-Flow Type Exhaust Diffuser Performance in a Low Pressure Steam Turbine
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Topics: Diffusers, Exhaust systems, Flow (Dynamics), Pressure, Steam turbines, Turbines, Blades, Separation (Technology), Steam, Boundary layers
Proceedings Papers

Unsteady Flow Features and Vibration Stresses of an Actual Size Steam Turbine Last Stage in Various Low Load Conditions

Naoki Shibukawa, Yoshifumi Iwasaki, Mitsunori Watanabe
Proc. ASME. GT2013, Volume 5B: Oil and Gas Applications; Steam Turbines, V05BT25A030, June 3–7, 2013
Publisher: American Society of Mechanical Engineers
Paper No: GT2013-95219
https://doi.org/10.1115/GT2013-95219
View Paper titled, Unsteady Flow Features and Vibration Stresses of an Actual Size Steam Turbine Last Stage in Various Low Load Conditions
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Topics: Steam turbines, Stress, Unsteady flow, Vibration, Blades, Pressure, Computational fluid dynamics, Flow (Dynamics), Fluctuations (Physics), Annulus
Proceedings Papers

An Upwind Eulerian-Eulerian Model for Non-Equilibrium Condensation in Steam Turbines

Xiaofeng Zhu, Xin Yuan, Zhirong Lin, Naoki Shibukawa, Tomohiko Tsukuda, Yoshiki Niizeki, Tadashi Tanuma
Proc. ASME. GT2013, Volume 5B: Oil and Gas Applications; Steam Turbines, V05BT25A024, June 3–7, 2013
Publisher: American Society of Mechanical Engineers
Paper No: GT2013-95047
https://doi.org/10.1115/GT2013-95047
View Paper titled, An Upwind Eulerian-Eulerian Model for Non-Equilibrium Condensation in Steam Turbines
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Topics: Condensation, Equilibrium (Physics), Steam turbines, Steam, Cascades (Fluid dynamics), Density, Eigenvalues, Flow (Dynamics), Internal energy (Physics), Jacobian matrices
Proceedings Papers

Influence of Wetness on Efficiency of the Full Scale Size Low Pressure Turbines

Tomohiko Tsukuda, Hiroyuki Kawagishi, Naoki Shibukawa, Tadayuki Hashidate, Koichi Goto, Tsuguhisa Tashima
Proc. ASME. GT2012, Volume 6: Oil and Gas Applications; Concentrating Solar Power Plants; Steam Turbines; Wind Energy, 707-716, June 11–15, 2012
Publisher: American Society of Mechanical Engineers
Paper No: GT2012-70056
https://doi.org/10.1115/GT2012-70056
View Paper titled, Influence of Wetness on Efficiency of the Full Scale Size Low Pressure Turbines
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Topics: Pressure, Turbines, Stress, Blades, Braking, Steam, Design, Flow (Dynamics)
Proceedings Papers

An Experimental Flow Investigation of Low Pressure Turbine Stages With Various Wet Conditions

Naoki Shibukawa, Tomohiko Tsukuda, Tadayuki Hashidate, Hiroyuki Kawagishi, Tatsuro Uchida, Koichi Goto
Proc. ASME. GT2012, Volume 6: Oil and Gas Applications; Concentrating Solar Power Plants; Steam Turbines; Wind Energy, 637-646, June 11–15, 2012
Publisher: American Society of Mechanical Engineers
Paper No: GT2012-69613
https://doi.org/10.1115/GT2012-69613
View Paper titled, An Experimental Flow Investigation of Low Pressure Turbine Stages With Various Wet Conditions
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Topics: Flow (Dynamics), Pressure, Turbines, Steam, Blades, Stators, Steam turbines, Design, Water
Proceedings Papers

The Impact of Rotor Inlet Cavity Volume and Length Scale on Efficiency

Konstantinos G. Barmpalias, Reza S. Abhari, Anestis I. Kalfas, Naoki Shibukawa, Takashi Sasaki
Proc. ASME. GT2012, Volume 6: Oil and Gas Applications; Concentrating Solar Power Plants; Steam Turbines; Wind Energy, 345-354, June 11–15, 2012
Publisher: American Society of Mechanical Engineers
Paper No: GT2012-68076
https://doi.org/10.1115/GT2012-68076
View Paper titled, The Impact of Rotor Inlet Cavity Volume and Length Scale on Efficiency
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Topics: Cavities, Rotors, Flow (Dynamics), Cavity walls, Corners (Structural elements), Geometry, Turbines, Turbomachinery, Vortices
Proceedings Papers

Numerical Investigation of Three-Dimensional Wet Steam Flows in an Exhaust Diffuser With Non-Uniform Inlet Flows From the Turbine Stages in a Steam Turbine

Tadashi Tanuma, Yasuhiro Sasao, Satoru Yamamoto, Yoshiki Niizeki, Naoki Shibukawa, Hiroshi Saeki
Proc. ASME. GT2012, Volume 6: Oil and Gas Applications; Concentrating Solar Power Plants; Steam Turbines; Wind Energy, 589-602, June 11–15, 2012
Publisher: American Society of Mechanical Engineers
Paper No: GT2012-69496
https://doi.org/10.1115/GT2012-69496
View Paper titled, Numerical Investigation of Three-Dimensional Wet Steam Flows in an Exhaust Diffuser With Non-Uniform Inlet Flows From the Turbine Stages in a Steam Turbine
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Topics: Diffusers, Exhaust systems, Flow (Dynamics), Steam, Steam turbines, Turbines, Blades, Evaluation methods, Design, Design engineering
Journal Articles

Design Considerations for Axial Steam Turbine Rotor Inlet Cavity Volume and Length Scale

Konstantinos G. Barmpalias, Reza S. Abhari, Anestis I. Kalfas, Toshio Hirano, Naoki Shibukawa, Takashi Sasaki
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. September 2012, 134(5): 051031.
https://doi.org/10.1115/1.4004827
Published Online: May 31, 2012
View Article titled, Design Considerations for Axial Steam Turbine Rotor Inlet Cavity Volume and Length Scale
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Topics: Cavities, Flow (Dynamics), Rotors, Stators, Vortices, Blades, Design, Pressure
Proceedings Papers

Three Dimensional Optimum Design of a Steam Turbine Stage With NURBS Curves

Tomohiro Tejima, Yoshiki Niizeki, Naoki Shibukawa, Akihiro Onoda, Satoru Watanabe, Xin Yuan, Zhirong Lin, Xiaofeng Zhu
Proc. ASME. AJK2011, ASME-JSME-KSME 2011 Joint Fluids Engineering Conference: Volume 1, Symposia – Parts A, B, C, and D, 1773-1783, July 24–29, 2011
Publisher: American Society of Mechanical Engineers
Paper No: AJK2011-05011
https://doi.org/10.1115/AJK2011-05011
View Paper titled, Three Dimensional Optimum Design of a Steam Turbine Stage With NURBS Curves
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Topics: Design, Steam turbines, Shapes, Blades, Optimization, Computational fluid dynamics, Turbine blades, Turbines, Computers, Exhaust systems
Proceedings Papers

Numerical Investigation of Exhaust Diffuser Performances in Low Pressure Turbine Casings

Tadashi Tanuma, Yasuhiro Sasao, Satoru Yamamoto, Shinji Takada, Yoshiki Niizeki, Naoki Shibukawa, Hiroshi Saeki
Proc. ASME. GT2011, Volume 7: Turbomachinery, Parts A, B, and C, 2347-2357, June 6–10, 2011
Publisher: American Society of Mechanical Engineers
Paper No: GT2011-45677
https://doi.org/10.1115/GT2011-45677
View Paper titled, Numerical Investigation of Exhaust Diffuser Performances in Low Pressure Turbine Casings
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Topics: Diffusers, Exhaust systems, Pressure, Turbines, Computational fluid dynamics, Steam turbines, Boundary layers, Boundary-value problems, Condensation, Design
Proceedings Papers

A Correlation Between Vibration Stresses and Flow Features of Steam Turbine Long Blades in Low Load Conditions

Naoki Shibukawa, Tomohiro Tejima, Yoshifumi Iwasaki, Itaru Murakami, Ikuo Saito
Proc. ASME. GT2011, Volume 7: Turbomachinery, Parts A, B, and C, 2437-2446, June 6–10, 2011
Publisher: American Society of Mechanical Engineers
Paper No: GT2011-46368
https://doi.org/10.1115/GT2011-46368
View Paper titled, A Correlation Between Vibration Stresses and Flow Features of Steam Turbine Long Blades in Low Load Conditions
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Topics: Blades, Flow (Dynamics), Steam turbines, Stress, Vibration, Pressure, Computational fluid dynamics, Aerodynamics, Fluid-dynamic forces, Simulation
Proceedings Papers

Design Considerations for Axial Steam Turbine Rotor Inlet Cavity Volume and Length Scale

Konstantinos G. Barmpalias, Anestis I. Kalfas, Reza S. Abhari, Toshio Hirano, Naoki Shibukawa, Takashi Sasaki
Proc. ASME. GT2011, Volume 7: Turbomachinery, Parts A, B, and C, 2243-2254, June 6–10, 2011
Publisher: American Society of Mechanical Engineers
Paper No: GT2011-45127
https://doi.org/10.1115/GT2011-45127
View Paper titled, Design Considerations for Axial Steam Turbine Rotor Inlet Cavity Volume and Length Scale
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Topics: Cavities, Design, Rotors, Steam turbines, Vortices, Stators, Aerodynamics, Flow (Dynamics)