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John P. Longley
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Journal Articles

Impact of the Wall-Parallel Length Scale of Roughness on the Development of Turbulent Boundary Layers in Turbines

Abigail M. Berhane, John P. Longley
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. February 2025, 147(2): 021011.
Paper No: TURBO-24-1185
https://doi.org/10.1115/1.4066579
Published Online: October 21, 2024
View Article titled, Impact of the Wall-Parallel Length Scale of Roughness on the Development of Turbulent Boundary Layers in Turbines
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Topics: Surface roughness, Sands, Boundary layers
Proceedings Papers

Impact of the Wall-Parallel Length Scale of Roughness on the Development of Turbulent Boundary Layers in Turbines

Abigail M. Berhane, John P. Longley
Proc. ASME. GT2024, Volume 12B: Turbomachinery — Axial Flow Turbine Aerodynamics; Deposition, Erosion, Fouling, and Icing, V12BT30A009, June 24–28, 2024
Publisher: American Society of Mechanical Engineers
Paper No: GT2024-122213
https://doi.org/10.1115/GT2024-122213
View Paper titled, Impact of the Wall-Parallel Length Scale of Roughness on the Development of Turbulent Boundary Layers in Turbines
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Topics: Boundary layer turbulence, Surface roughness, Turbines, Sands, Separation (Technology), Additive manufacturing, Compressors, Engines, Flat plates, Momentum
Journal Articles

A New Multi-Stage Turbine Stator Design for Improved Performance Retention

Heather K. Jameson, John P. Longley
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. June 2024, 146(6): 061006.
Paper No: TURBO-23-1269
https://doi.org/10.1115/1.4064285
Published Online: January 29, 2024
View Article titled, A New Multi-Stage Turbine Stator Design for Improved Performance Retention
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Topics: Flow (Dynamics), Rotors, Stators, Vortices, Leakage flows, Leakage, Separation (Technology), Pressure, Vorticity
Journal Articles

Modeling the Unsteady Dynamics of a Turbine Research Facility

John P. Longley
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. December 2023, 145(12): 121001.
Paper No: TURBO-20-1034
https://doi.org/10.1115/1.4048021
Published Online: October 9, 2023
View Article titled, Modeling the Unsteady Dynamics of a Turbine Research Facility
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Topics: Control systems, Dynamics (Mechanics), Flow (Dynamics), Turbines, Honeycomb structures, Simulation
Proceedings Papers

A New Multi-Stage Turbine Stator Design for Improved Performance Retention

Heather K. Jameson, John P. Longley
Proc. ASME. GT2020, Volume 2B: Turbomachinery, V02BT33A006, September 21–25, 2020
Publisher: American Society of Mechanical Engineers
Paper No: GT2020-14407
https://doi.org/10.1115/GT2020-14407
View Paper titled, A New Multi-Stage Turbine Stator Design for Improved Performance Retention
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Topics: Design, Stators, Turbines, Vortices, Rotors, Cavities, Flow (Dynamics), Leakage, Leakage flows, Separation (Technology)
Proceedings Papers

Modelling the Unsteady Dynamics of a Turbine Research Facility

John P. Longley
Proc. ASME. GT2019, Volume 2C: Turbomachinery, V02CT41A015, June 17–21, 2019
Publisher: American Society of Mechanical Engineers
Paper No: GT2019-90352
https://doi.org/10.1115/GT2019-90352
View Paper titled, Modelling the Unsteady Dynamics of a Turbine Research Facility
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Topics: Dynamics (Mechanics), Modeling, Turbines, Control systems, Simulation, Flow (Dynamics), Noise (Sound), Brakes, Honeycomb structures, Reliability
Journal Articles

Clocking in Low-Pressure Turbines

Kathryn R. Evans, John P. Longley
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research-Article
J. Turbomach. October 2017, 139(10): 101003.
Paper No: TURBO-16-1220
https://doi.org/10.1115/1.4036341
Published Online: May 9, 2017
View Article titled, Clocking in Low-Pressure Turbines
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Topics: Flow (Dynamics), Stators, Turbines, Wakes, Pressure, Rotors, Blades
Journal Articles

Accounting for Uncontrolled Variations in Low-Speed Turbine Experiments

Kathryn R. Evans, John P. Longley
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research-Article
J. Turbomach. October 2017, 139(10): 101005.
Paper No: TURBO-16-1222
https://doi.org/10.1115/1.4036342
Published Online: May 9, 2017
View Article titled, Accounting for Uncontrolled Variations in Low-Speed Turbine Experiments
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Topics: Accounting, Blades, Flow (Dynamics), Turbines, Reynolds number
Journal Articles

Accounting for Eccentricity in Compressor Performance Predictions

Anna M. Young, Teng Cao, Ivor J. Day, John P. Longley
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research-Article
J. Turbomach. September 2017, 139(9): 091008.
Paper No: TURBO-17-1014
https://doi.org/10.1115/1.4036201
Published Online: April 19, 2017
View Article titled, Accounting for Eccentricity in Compressor Performance Predictions
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Topics: Clearances (Engineering), Compressors, Flow (Dynamics), Annulus, Rotors
Proceedings Papers

Accounting for Eccentricity in Compressor Performance Predictions

Anna M. Young, Teng Cao, Ivor J. Day, John P. Longley
Proc. ASME. GT2016, Volume 2A: Turbomachinery, V02AT37A017, June 13–17, 2016
Publisher: American Society of Mechanical Engineers
Paper No: GT2016-56681
https://doi.org/10.1115/GT2016-56681
View Paper titled, Accounting for Eccentricity in Compressor Performance Predictions
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Topics: Accounting, Compressors, Clearances (Engineering), Machinery, Aircraft engines, Design, Engines, Modeling, Pressure, Stability
Proceedings Papers

A Review of Non-Steady Flow Models for Compressor Stability

John P. Longley
Proc. ASME. GT1993, Volume 1: Aircraft Engine; Marine; Turbomachinery; Microturbines and Small Turbomachinery, V001T03A006, May 24–27, 1993
Publisher: American Society of Mechanical Engineers
Paper No: 93-GT-017
https://doi.org/10.1115/93-GT-017
View Paper titled, A Review of Non-Steady Flow Models for Compressor Stability
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Topics: Compressors, Stability, Unsteady flow, Modeling, Fluid dynamics
Proceedings Papers

Calculating the Flowfield Behaviour of High-Speed Multi-Stage Compressors

John P. Longley
Proc. ASME. GT1997, Volume 1: Aircraft Engine; Marine; Turbomachinery; Microturbines and Small Turbomachinery, V001T03A084, June 2–5, 1997
Publisher: American Society of Mechanical Engineers
Paper No: 97-GT-468
https://doi.org/10.1115/97-GT-468
View Paper titled, Calculating the Flowfield Behaviour of High-Speed Multi-Stage Compressors
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Topics: Compressors, Blades, Flow (Dynamics), Simulation, Dynamics (Mechanics), Fluid dynamics, Nonlinear equations, Steady state, Unsteady flow
Proceedings Papers

Controlling Tip Leakage Flow Over a Shrouded Turbine Rotor Using an Air-Curtain

Eric M. Curtis, John D. Denton, John P. Longley, Budimir Rosic
Proc. ASME. GT2009, Volume 7: Turbomachinery, Parts A and B, 885-894, June 8–12, 2009
Publisher: American Society of Mechanical Engineers
Paper No: GT2009-59411
https://doi.org/10.1115/GT2009-59411
View Paper titled, Controlling Tip Leakage Flow Over a Shrouded Turbine Rotor Using an Air-Curtain
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Topics: Leakage flows, Rotors, Turbines, Flow (Dynamics), Leakage, Blades, Cavities, Clearances (Engineering), Instrumentation, Jets
Proceedings Papers

An Experimental Study of the Inception of Rotating Stall in a Single-Stage Low-Speed Axial Compressor

Alexander K. Simpson, John P. Longley
Proc. ASME. GT2007, Volume 6: Turbo Expo 2007, Parts A and B, 87-97, May 14–17, 2007
Publisher: American Society of Mechanical Engineers
Paper No: GT2007-27181
https://doi.org/10.1115/GT2007-27181
View Paper titled, An Experimental Study of the Inception of Rotating Stall in a Single-Stage Low-Speed Axial Compressor
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Topics: Compressors, Rotors, Stall inception, Axial flow, Blades, Geometry, Stability, Stators
Proceedings Papers

Calculating Stall and Surge Transients

John P. Longley
Proc. ASME. GT2007, Volume 6: Turbo Expo 2007, Parts A and B, 125-136, May 14–17, 2007
Publisher: American Society of Mechanical Engineers
Paper No: GT2007-27378
https://doi.org/10.1115/GT2007-27378
View Paper titled, Calculating Stall and Surge Transients
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Topics: Surges, Transients (Dynamics), Blades, Compression, Flow (Dynamics), Simulation, Design, Stress