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Journal Articles

Experimental Investigation of the Effect of Bleed on the Aerodynamics of a Low-Pressure Compressor Stage in a Turbofan Engine

Apostolos Spanelis, Paul A. Denman, Ian Mariah, A. Duncan Walker
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. March 2024, 146(3): 031013.
Paper No: TURBO-23-1181
https://doi.org/10.1115/1.4064084
Published Online: December 14, 2023
View Article titled, Experimental Investigation of the Effect of Bleed on the Aerodynamics of a Low-Pressure Compressor Stage in a Turbofan Engine
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Topics: Compressors, Design, Ducts, Engines, Flow (Dynamics), Pressure, Rotors, Struts (Engineering), Turbofans, Aerodynamics
Proceedings Papers

Towards Best Practice for Predicting a Lifted Hydrogen Diffusion Flame Using a Flamelet Generated Manifold Approach

Ashley van Bruygom, Andrew Garmory, A. Duncan Walker
Proc. ASME. GT2023, Volume 3A: Combustion, Fuels, and Emissions, V03AT04A055, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-102250
https://doi.org/10.1115/GT2023-102250
View Paper titled, Towards Best Practice for Predicting a Lifted Hydrogen Diffusion Flame Using a Flamelet Generated Manifold Approach
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Topics: Diffusion flames, Flamelet generated manifold, Hydrogen, Modeling, Simulation, Turbulence, Chemistry, Combustion, Flames, Flow (Dynamics)
Proceedings Papers

Experimental Investigation of the Effect of Bleed on the Aerodynamics of a Low-Pressure Compressor Stage in a Turbofan Engine

Apostolos Spanelis, Paul A. Denman, Ian Mariah, A. Duncan Walker
Proc. ASME. GT2023, Volume 13C: Turbomachinery — Deposition, Erosion, Fouling, and Icing; Design Methods and CFD Modeling for Turbomachinery; Ducts, Noise, and Component Interactions, V13CT33A007, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-102260
https://doi.org/10.1115/GT2023-102260
View Paper titled, Experimental Investigation of the Effect of Bleed on the Aerodynamics of a Low-Pressure Compressor Stage in a Turbofan Engine
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Topics: Aerodynamics, Compressors, Ducts, Engines, Pressure, Struts (Engineering), Turbofans
Journal Articles

Experimental Investigation of Secondary Flows and Length Reduction for a Low-Pressure Compressor Transition Duct

Dimitra Tsakmakidou, Ian Mariah, A. Duncan Walker, Chris Hall, Harry Simpson
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. January 2022, 144(1): 011017.
Paper No: GTP-21-1353
https://doi.org/10.1115/1.4052086
Published Online: October 18, 2021
View Article titled, Experimental Investigation of Secondary Flows and Length Reduction for a Low-Pressure Compressor Transition Duct
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Topics: Ducts, Flow (Dynamics), Rotors, Pressure, Probes, Compressors
Journal Articles

Aerodynamic Influence of a Bleed on the Last Stage of a Low-Pressure Compressor and S-Duct

Apostolos Spanelis, A. Duncan Walker
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. February 2022, 144(2): 021007.
Paper No: TURBO-20-1157
https://doi.org/10.1115/1.4052134
Published Online: September 27, 2021
View Article titled, Aerodynamic Influence of a Bleed on the Last Stage of a Low-Pressure Compressor and S-Duct
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Topics: Compressors, Diffusion (Physics), Ducts, Flow (Dynamics), Pressure, Rotors, Geometry
Journal Articles

An Experimental, Aerodynamic Evaluation of Design Choices for a Low-Pressure Compressor Transition Duct

A. Duncan Walker, Ian Mariah, Chris Hall
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. September 2021, 143(9): 091004.
Paper No: TURBO-20-1386
https://doi.org/10.1115/1.4050598
Published Online: May 3, 2021
View Article titled, An Experimental, Aerodynamic Evaluation of Design Choices for a Low-Pressure Compressor Transition Duct
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Topics: Compressors, Design, Ducts, Flow (Dynamics), Pressure, Struts (Engineering), Rotors
Proceedings Papers

A Numerical Investigation Into Secondary Flows at the Inlet to a Low-Pressure Compressor Transition Duct

Dimitra Tsakmakidou, A. Duncan Walker, Chris Hall
Proc. ASME. GT2020, Volume 2D: Turbomachinery, V02DT36A021, September 21–25, 2020
Publisher: American Society of Mechanical Engineers
Paper No: GT2020-16065
https://doi.org/10.1115/GT2020-16065
View Paper titled, A Numerical Investigation Into Secondary Flows at the Inlet to a Low-Pressure Compressor Transition Duct
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Topics: Compressors, Computational fluid dynamics, Ducts, Flow (Dynamics), Pressure
Proceedings Papers

An Experimental, Aerodynamic Evaluation of Design Choices for a Low-Pressure Compressor Transition Duct

A. Duncan Walker, Ian Mariah, Chris Hall
Proc. ASME. GT2020, Volume 2D: Turbomachinery, V02DT36A022, September 21–25, 2020
Publisher: American Society of Mechanical Engineers
Paper No: GT2020-16318
https://doi.org/10.1115/GT2020-16318
View Paper titled, An Experimental, Aerodynamic Evaluation of Design Choices for a Low-Pressure Compressor Transition Duct
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Topics: Aerodynamics, Compressors, Design, Ducts, Pressure
Journal Articles

The Influence of Fan Root Flow on the Aerodynamic of a Low-Pressure Compressor Transition Duct

A. Duncan Walker, Ian Mariah, Dimitra Tsakmakidou, Hiren Vadhvana, Chris Hall
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. January 2020, 142(1): 011002.
Paper No: TURBO-19-1210
https://doi.org/10.1115/1.4045272
Published Online: December 14, 2019
View Article titled, The Influence of Fan Root Flow on the Aerodynamic of a Low-Pressure Compressor Transition Duct
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Topics: Boundary layers, Compressors, Computational fluid dynamics, Ducts, Flow (Dynamics), Pressure, Rotors, Wakes, Separation (Technology)
Journal Articles

Influence of Purge Flow Swirl at Exit to the High-Pressure Compressor on OGV/Pre-Diffuser and Combustion System Aerodynamics

A. Duncan Walker, Bharat Koli, Peter A. Beecroft
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research-Article
J. Turbomach. September 2019, 141(9): 091009.
Paper No: TURBO-18-1105
https://doi.org/10.1115/1.4043781
Published Online: June 14, 2019
View Article titled, Influence of Purge Flow Swirl at Exit to the High-Pressure Compressor on OGV/Pre-Diffuser and Combustion System Aerodynamics
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Topics: Computational fluid dynamics, Diffusers, Flow (Dynamics), Pressure, Combustion systems, Aerodynamics, Rotors, Compressors
Journal Articles

Improved Modeling Capabilities of the Airflow Within Turbine Case Cooling Systems Using Smart Porous Media

Yanling Li, A. Duncan Walker, John Irving
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. May 2019, 141(5): 051003.
Paper No: GTP-18-1212
https://doi.org/10.1115/1.4041933
Published Online: November 22, 2018
View Article titled, Improved Modeling Capabilities of the Airflow Within Turbine Case Cooling Systems Using Smart Porous Media
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Topics: Cooling, Flow (Dynamics), Impingement cooling, Manifolds, Porous materials, Turbines, Computational fluid dynamics, Junctions
Journal Articles

Impact of a Cooled Cooling Air System on the External Aerodynamics of a Gas Turbine Combustion System

A. Duncan Walker, Bharat Koli, Liang Guo, Peter Beecroft, Marco Zedda
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. May 2017, 139(5): 051504.
Paper No: GTP-16-1199
https://doi.org/10.1115/1.4035228
Published Online: January 10, 2017
View Article titled, Impact of a Cooled Cooling Air System on the External Aerodynamics of a Gas Turbine Combustion System
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Topics: Aerodynamics, Combustion chambers, Combustion systems, Cooling, Flow (Dynamics), Pipes, Pressure, Gas turbines, Engines, Diffusers
Proceedings Papers

Duct Aerodynamics for Intercooled Aero Gas Turbines: Constraints, Concepts and Design Methodology

A. Duncan Walker, Jonathan F. Carrotte, Andrew M. Rolt
Proc. ASME. GT2009, Volume 7: Turbomachinery, Parts A and B, 749-758, June 8–12, 2009
Publisher: American Society of Mechanical Engineers
Paper No: GT2009-59612
https://doi.org/10.1115/GT2009-59612
View Paper titled, Duct Aerodynamics for Intercooled Aero Gas Turbines: Constraints, Concepts and Design Methodology
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Topics: Aerodynamics, Design methodology, Ducts, Gas turbines, Design, Pressure, Aircraft engines, Compressors, Cooling, Cycles
Proceedings Papers

The Influence of Dump Gap on External Combustor Aerodynamics at High Fuel Injector Flow Rates

A. Duncan Walker, Jon F. Carrotte, James J. McGuirk
Proc. ASME. GT2008, Volume 6: Turbomachinery, Parts A, B, and C, 1723-1733, June 9–13, 2008
Publisher: American Society of Mechanical Engineers
Paper No: GT2008-50271
https://doi.org/10.1115/GT2008-50271
View Paper titled, The Influence of Dump Gap on External Combustor Aerodynamics at High Fuel Injector Flow Rates
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Topics: Aerodynamics, Combustion chambers, Flow (Dynamics), Fuel injectors, Diffusers, Rotors, Design, Annulus, Compressors, Carbon dioxide
Proceedings Papers

Compressor/Diffuser/Combustor Aerodynamic Interactions in Lean Module Combustors

A. Duncan Walker, Jon F. Carrotte, James J. McGuirk
Proc. ASME. GT2007, Volume 6: Turbo Expo 2007, Parts A and B, 1857-1864, May 14–17, 2007
Publisher: American Society of Mechanical Engineers
Paper No: GT2007-27872
https://doi.org/10.1115/GT2007-27872
View Paper titled, Compressor/Diffuser/Combustor Aerodynamic Interactions in Lean Module Combustors
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Topics: Combustion chambers, Compressors, Diffusers, Flow (Dynamics), Ejectors, Annulus, Geometry, Rotors, Aerodynamics, Fuel injectors
Journal Articles

The Influence of Dump Gap on External Combustor Aerodynamics at High Fuel Injector Flow Rates

A. Duncan Walker, Jon F. Carrotte, James J. McGuirk
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research Papers
J. Eng. Gas Turbines Power. May 2009, 131(3): 031506.
https://doi.org/10.1115/1.3028230
Published Online: February 11, 2009
View Article titled, The Influence of Dump Gap on External Combustor Aerodynamics at High Fuel Injector Flow Rates
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Topics: Annulus, Combustion chambers, Flames, Flow (Dynamics), Fuel injectors, Pressure, Rotors, Aerodynamics, Compressors, Ejectors
Proceedings Papers

Experimental and Computational Study of Hybrid Diffusers for Gas Turbine Combustors

A. Duncan Walker, Paul A. Denman, James J. McGuirk
Proc. ASME. GT2003, Volume 2: Turbo Expo 2003, 311-320, June 16–19, 2003
Publisher: American Society of Mechanical Engineers
Paper No: GT2003-38406
https://doi.org/10.1115/GT2003-38406
View Paper titled, Experimental and Computational Study of Hybrid Diffusers for Gas Turbine Combustors
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Topics: Combustion chambers, Diffusers, Gas turbines, Flow (Dynamics), Diffusion (Physics), Pressure, Annulus, Boundary layers, Cooling, Design
Proceedings Papers

Enhanced External Aerodynamic Performance of a Generic Combustor Using an Integrated OGV/Pre-Diffuser Design Technique

A. Duncan Walker, Jon F. Carrotte, James J. McGuirk
Proc. ASME. GT2006, Volume 1: Combustion and Fuels, Education, 149-160, May 8–11, 2006
Publisher: American Society of Mechanical Engineers
Paper No: GT2006-90184
https://doi.org/10.1115/GT2006-90184
View Paper titled, Enhanced External Aerodynamic Performance of a Generic Combustor Using an Integrated OGV/Pre-Diffuser Design Technique
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Topics: Combustion chambers, Diffusers, Engineering design processes, Design, Flow (Dynamics), Pressure, Annulus, Blades, Boundary layers, Combustion systems
Journal Articles

Compressor/Diffuser/Combustor Aerodynamic Interactions in Lean Module Combustors

A. Duncan Walker, Jon F. Carrotte, James J. McGuirk
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research Papers
J. Eng. Gas Turbines Power. January 2008, 130(1): 011504.
https://doi.org/10.1115/1.2747646
Published Online: January 9, 2008
View Article titled, Compressor/Diffuser/Combustor Aerodynamic Interactions in Lean Module Combustors
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Topics: Annulus, Combustion chambers, Compressors, Diffusers, Ejectors, Flow (Dynamics), Fuel injectors, Geometry, Rotors, Pressure
Journal Articles

Enhanced External Aerodynamic Performance of a Generic Combustor Using An Integrated OGV/Prediffuser Design Technique

A. Duncan Walker, Jon F. Carrotte, James J. McGuirk
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Technical Papers
J. Eng. Gas Turbines Power. January 2007, 129(1): 80–87.
https://doi.org/10.1115/1.2364008
Published Online: February 1, 2006
View Article titled, Enhanced External Aerodynamic Performance of a Generic Combustor Using An Integrated OGV/Prediffuser Design Technique
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Topics: Annulus, Blades, Boundary layers, Combustion chambers, Design, Diffusers, Flames, Flow (Dynamics), Geometry, Pressure