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Walter F. O’Brien
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Proceedings Papers

Development, Analysis, and Validation of a Simultaneous Inlet Total Pressure and Swirl Distortion Generator

Dustin J. Frohnapfel, K. Todd Lowe, Walter F. O’Brien
Proc. ASME. GT2020, Volume 1: Aircraft Engine; Fans and Blowers, V001T01A038, September 21–25, 2020
Publisher: American Society of Mechanical Engineers
Paper No: GT2020-16125
https://doi.org/10.1115/GT2020-16125
View Paper titled, Development, Analysis, and Validation of a Simultaneous Inlet Total Pressure and Swirl Distortion Generator
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Topics: Generators, Pressure, Turbofans
Proceedings Papers

A Numerical Analysis of the Effects of Liquid Carryover on the Performance of a Two-Stage Centrifugal Compressor

Chaitanya V. Halbe, Walter F. O’Brien, William T. Cousins, Vishnu Sishtla
Proc. ASME. GT2018, Volume 2B: Turbomachinery, V02BT44A028, June 11–15, 2018
Publisher: American Society of Mechanical Engineers
Paper No: GT2018-77015
https://doi.org/10.1115/GT2018-77015
View Paper titled, A Numerical Analysis of the Effects of Liquid Carryover on the Performance of a Two-Stage Centrifugal Compressor
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Topics: Compressors, Numerical analysis, Drops, Flow (Dynamics), Aerodynamics, Compression, Computational fluid dynamics, Computational methods, Design, Dynamics (Mechanics)
Proceedings Papers

Characterizing Static and Dynamic Mechanical Properties for Additive Manufactured ULTEM 9085 Used to Construct Flow Control Devices for Turbomachinery Applications

Khang D. Pham, Walter F. O’Brien, Scott W. Case
Proc. ASME. GT2018, Volume 6: Ceramics; Controls, Diagnostics, and Instrumentation; Education; Manufacturing Materials and Metallurgy, V006T24A008, June 11–15, 2018
Publisher: American Society of Mechanical Engineers
Paper No: GT2018-75430
https://doi.org/10.1115/GT2018-75430
View Paper titled, Characterizing Static and Dynamic Mechanical Properties for Additive Manufactured ULTEM 9085 Used to Construct Flow Control Devices for Turbomachinery Applications
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Topics: Additive manufacturing, Flow control, Mechanical properties, Turbomachinery, Stress, Fatigue life, ASTM International, Fatigue properties, Tension, Extruding
Proceedings Papers

Turbofan Nose Cone Interactions With Inlet Swirl

Dustin J. Frohnapfel, Elizabeth Mack, Alexandrina Untaroiu, Walter F. O’Brien, K. Todd Lowe
Proc. ASME. GT2018, Volume 1: Aircraft Engine; Fans and Blowers; Marine, V001T01A032, June 11–15, 2018
Publisher: American Society of Mechanical Engineers
Paper No: GT2018-76616
https://doi.org/10.1115/GT2018-76616
View Paper titled, Turbofan Nose Cone Interactions With Inlet Swirl
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Topics: Turbofans, Fluids, Ducts, Engines, Architecture, Aviation, Computational fluid dynamics, Flow (Dynamics), Geometry, Modeling
Journal Articles

Complex Flow Generation and Development in a Full-Scale Turbofan Inlet

Tamara Guimarães, K. Todd Lowe, Walter F. O'Brien
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. August 2018, 140(8): 082606.
Paper No: GTP-17-1545
https://doi.org/10.1115/1.4039179
Published Online: May 14, 2018
View Article titled, Complex Flow Generation and Development in a Full-Scale Turbofan Inlet
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Topics: Engines, Flow (Dynamics), Turbulence, Turbofans, Vortices, Aircraft, Stress
Journal Articles

Experimental Quantification of Fan Rotor Effects on Inlet Swirl Using Swirl Distortion Descriptors

Dustin J. Frohnapfel, K. Todd Lowe, Walter F. O'Brien
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. August 2018, 140(8): 082603.
Paper No: GTP-17-1631
https://doi.org/10.1115/1.4039425
Published Online: May 3, 2018
View Article titled, Experimental Quantification of Fan Rotor Effects on Inlet Swirl Using Swirl Distortion Descriptors
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Topics: Engines, Flow (Dynamics), Rotors, Vortices, Design, Turbofans
Proceedings Papers

Complex Flow Generation and Development in a Full-Scale Turbofan Inlet

Tamara Guimarães, K. Todd Lowe, Walter F. O’Brien
Proc. ASME. GT2017, Volume 2B: Turbomachinery, V02BT42A012, June 26–30, 2017
Publisher: American Society of Mechanical Engineers
Paper No: GT2017-64756
https://doi.org/10.1115/GT2017-64756
View Paper titled, Complex Flow Generation and Development in a Full-Scale Turbofan Inlet
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Topics: Flow (Dynamics), Turbofans, Engines, Vortices, Aircraft, Inflow, Stress, Swirling flow, Turbulence, Aerodynamics
Proceedings Papers

Experimental Quantification of Fan Rotor Effects on Inlet Swirl Using Swirl Distortion Descriptors

Dustin J. Frohnapfel, Walter F. O’Brien, K. Todd Lowe
Proc. ASME. GT2017, Volume 2B: Turbomachinery, V02BT42A013, June 26–30, 2017
Publisher: American Society of Mechanical Engineers
Paper No: GT2017-64779
https://doi.org/10.1115/GT2017-64779
View Paper titled, Experimental Quantification of Fan Rotor Effects on Inlet Swirl Using Swirl Distortion Descriptors
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Topics: Rotors, Engines, Flow (Dynamics), Design, Turbofans, Aircraft, Architecture, Generators
Proceedings Papers

Leveraging Correlation to Reduce Uncertainty in Efficiency Measurements for Low Pressure Ratio Fans

Anthony M. Ferrar, William C. Schneck, III, Walter F. O’Brien
Proc. ASME. GT2016, Volume 2A: Turbomachinery, V02AT37A043, June 13–17, 2016
Publisher: American Society of Mechanical Engineers
Paper No: GT2016-57718
https://doi.org/10.1115/GT2016-57718
View Paper titled, Leveraging Correlation to Reduce Uncertainty in Efficiency Measurements for Low Pressure Ratio Fans
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Topics: Fans, Pressure, Uncertainty, Errors, Thermocouples, Temperature, Calibration, Data acquisition systems, Experimental design, Measurement uncertainty
Proceedings Papers

A CFD Analysis of the Effects of Two-Phase Flow in a Two-Stage Centrifugal Compressor

Chaitanya V. Halbe, Walter F. O’Brien, William T. Cousins, Vishnu Sishtla
Proc. ASME. GT2015, Volume 2C: Turbomachinery, V02CT42A016, June 15–19, 2015
Publisher: American Society of Mechanical Engineers
Paper No: GT2015-42534
https://doi.org/10.1115/GT2015-42534
View Paper titled, A CFD Analysis of the Effects of Two-Phase Flow in a Two-Stage Centrifugal Compressor
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Topics: Compressors, Computational fluid dynamics, Two-phase flow, Drops, Simulation, Dynamics (Mechanics), Heat, Momentum, Pressure
Proceedings Papers

Separated Flow in a Low Speed Two-Dimensional Cascade: Part I — Flow Visualization and Time-Mean Velocity Measurements

Adam M. Yocum, Walter F. O’Brien
Proc. ASME. GT1992, Volume 1: Turbomachinery, V001T01A121, June 1–4, 1992
Publisher: American Society of Mechanical Engineers
Paper No: 92-GT-356
https://doi.org/10.1115/92-GT-356
View Paper titled, Separated Flow in a Low Speed Two-Dimensional Cascade: Part I — Flow Visualization and Time-Mean Velocity Measurements
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Topics: Cascades (Fluid dynamics), Flow (Dynamics), Flow visualization, Velocity measurement, Blades, Geometry, Probes, Separation (Technology), Smoke, Wakes
Proceedings Papers

Separated Flow in a Low Speed Two-Dimensional Cascade: Part II — Cascade Performance

Adam M. Yocum, Walter F. O’Brien
Proc. ASME. GT1992, Volume 1: Turbomachinery, V001T01A122, June 1–4, 1992
Publisher: American Society of Mechanical Engineers
Paper No: 92-GT-357
https://doi.org/10.1115/92-GT-357
View Paper titled, Separated Flow in a Low Speed Two-Dimensional Cascade: Part II — Cascade Performance
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Topics: Cascades (Fluid dynamics), Flow (Dynamics), Blades, Airfoils, Computer simulation, Flat plates, Geometry, Pressure, Pressure measurement, Reynolds number
Proceedings Papers

A Wide-Range Axial-Flow Compressor Stage Performance Model

Gregory S. Bloch, Walter F. O’Brien
Proc. ASME. GT1992, Volume 1: Turbomachinery, V001T01A025, June 1–4, 1992
Publisher: American Society of Mechanical Engineers
Paper No: 92-GT-058
https://doi.org/10.1115/92-GT-058
View Paper titled, A Wide-Range Axial-Flow Compressor Stage Performance Model
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Topics: Axial flow, Compressors, Compression, Flow (Dynamics), Aircraft, Arches, Computers, Gas turbines, Steady state
Proceedings Papers

Stage-by-Stage Dynamic Compression System Modeling for Split Core and Bypass Systems

Jules W. Lindau, Walter F. O’Brien
Proc. ASME. GT1996, Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; General, V005T16A015, June 10–13, 1996
Publisher: American Society of Mechanical Engineers
Paper No: 96-GT-279
https://doi.org/10.1115/96-GT-279
View Paper titled, Stage-by-Stage Dynamic Compression System Modeling for Split Core and Bypass Systems
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Topics: Compression, Modeling, Flow (Dynamics), Compressors, Simulation, Surges
Proceedings Papers

The Use of Circumferentially Nonuniform Stators to Attenuate LP Compressor Rotor-Stator-Strut Aerodynamic and Mechanical Interactions

Markland G. Jones, Michael T. Barton, Walter F. O’Brien
Proc. ASME. GT1996, Volume 1: Turbomachinery, V001T01A051, June 10–13, 1996
Publisher: American Society of Mechanical Engineers
Paper No: 96-GT-154
https://doi.org/10.1115/96-GT-154
View Paper titled, The Use of Circumferentially Nonuniform Stators to Attenuate LP Compressor Rotor-Stator-Strut Aerodynamic and Mechanical Interactions
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Topics: Compressors, Rotors, Stators, Struts (Engineering), Pressure, Computers, Engines, Blades, Design, Flow (Dynamics)
Proceedings Papers

Dynamic Modeling of Starting Aerodynamics and Stage Matching in an Axi-Centrifugal Compressor

Kevin Wilkes, Walter F. O’Brien, A. Karl Owen
Proc. ASME. GT1996, Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; General, V005T16A014, June 10–13, 1996
Publisher: American Society of Mechanical Engineers
Paper No: 96-GT-278
https://doi.org/10.1115/96-GT-278
View Paper titled, Dynamic Modeling of Starting Aerodynamics and Stage Matching in an Axi-Centrifugal Compressor
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Topics: Aerodynamics, Compressors, Dynamic modeling, Simulation, Design, Engines, Flow (Dynamics), Gas turbines, Transients (Dynamics)
Proceedings Papers

A Shock Loss Model for Supersonic Compressor Cascades

Gregory S. Bloch, William W. Copenhaver, Walter F. O’Brien
Proc. ASME. GT1997, Volume 1: Aircraft Engine; Marine; Turbomachinery; Microturbines and Small Turbomachinery, V001T03A065, June 2–5, 1997
Publisher: American Society of Mechanical Engineers
Paper No: 97-GT-405
https://doi.org/10.1115/97-GT-405
View Paper titled, A Shock Loss Model for Supersonic Compressor Cascades
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Topics: Compressors, Shock (Mechanics), Mach number, Airfoils, Boundary layers, Cascades (Fluid dynamics), Compression, Flow (Dynamics), Fluid mechanics, Geometry
Proceedings Papers

Effect of BLI–Type Inlet Distortion on Turbofan Engine Performance

James R. Lucas, Walter F. O’Brien, Anthony M. Ferrar
Proc. ASME. GT2014, Volume 1A: Aircraft Engine; Fans and Blowers, V01AT01A037, June 16–20, 2014
Publisher: American Society of Mechanical Engineers
Paper No: GT2014-26666
https://doi.org/10.1115/GT2014-26666
View Paper titled, Effect of BLI–Type Inlet Distortion on Turbofan Engine Performance
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Topics: Engines, Turbofans, Boundary layers, Flow (Dynamics), Aircraft, Emissions, Entropy, Pressure, Thrust, Wire mesh
Journal Articles

Flow Control Over a Circular Cylinder Using Pulsed Dielectric Barrier Discharge Actuators

William C. Schneck, III, Walter F. O'Brien
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research-Article
J. Turbomach. January 2015, 137(1): 011001.
Paper No: TURBO-14-1127
https://doi.org/10.1115/1.4028236
Published Online: August 26, 2014
View Article titled, Flow Control Over a Circular Cylinder Using Pulsed Dielectric Barrier Discharge Actuators
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Topics: Actuators, Flow control, Wakes, Momentum, Flow (Dynamics), Probes, Reynolds number, Cylinders
Proceedings Papers

Flow Control Over a Circular Cylinder Using Pulsed DBD Actuators

William C. Schneck, III, Walter F. O’Brien
Proc. ASME. GT2012, Volume 1: Aircraft Engine; Ceramics; Coal, Biomass and Alternative Fuels; Controls, Diagnostics and Instrumentation, 947-957, June 11–15, 2012
Publisher: American Society of Mechanical Engineers
Paper No: GT2012-69993
https://doi.org/10.1115/GT2012-69993
View Paper titled, Flow Control Over a Circular Cylinder Using Pulsed DBD Actuators
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Topics: Actuators, Circular cylinders, Flow control, Flow (Dynamics), Reynolds number, Wakes, Plasmas (Ionized gases), Electric fields, Gas turbines, Pressure gradient