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Jason C. Wilkes
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Proceedings Papers

Technoeconomic Comparison of sCO2 and ORC Systems for Waste Heat Recovery

Timothy C. Allison, Jason C. Wilkes, Karl Wygant, Robert Pelton
Proc. ASME. GT2022, Volume 9: Supercritical CO2, V009T28A029, June 13–17, 2022
Publisher: American Society of Mechanical Engineers
Paper No: GT2022-83434
https://doi.org/10.1115/GT2022-83434
View Paper titled, Technoeconomic Comparison of sCO2 and ORC Systems for Waste Heat Recovery
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Topics: Heat recovery, Organic Rankine cycle, Supercritical carbon dioxide, Thermodynamic power cycles
Proceedings Papers

Measurements of End Cap Temperatures in a Multistage Barrel-Style Centrifugal Compressor

Natalie R. Smith, Jason C. Wilkes, Jonathan Wade, Timothy C. Allison, Meera Day Towler, J. Jeffrey Moore, Ian Weinberg, Michael McCune
Proc. ASME. GT2019, Volume 9: Oil and Gas Applications; Supercritical CO2 Power Cycles; Wind Energy, V009T27A026, June 17–21, 2019
Publisher: American Society of Mechanical Engineers
Paper No: GT2019-91798
https://doi.org/10.1115/GT2019-91798
View Paper titled, Measurements of End Cap Temperatures in a Multistage Barrel-Style Centrifugal Compressor
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Topics: Compressors, Temperature, Gas compressors, Fluids, Leakage, Risk, Seals, Temperature distribution
Journal Articles

Experimental Validation of a Wide-Range Centrifugal Compressor Stage for Supercritical CO 2 Power Cycles

Timothy C. Allison, Natalie R. Smith, Robert Pelton, Jason C. Wilkes, Sewoong Jung
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. June 2019, 141(6): 061011.
Paper No: GTP-18-1621
https://doi.org/10.1115/1.4041920
Published Online: February 18, 2019
View Article titled, Experimental Validation of a Wide-Range Centrifugal Compressor Stage for Supercritical CO 2 Power Cycles
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Topics: Compressors, Computational fluid dynamics, Design, Flow (Dynamics), Impellers, Thermodynamic power cycles, Diffusers, Temperature, Supercritical carbon dioxide
Journal Articles

The Comparison of Aerodynamic Performance Data Acquired From Thermal Measurements and a Torquemeter on a Compressor Impeller

Natalie R. Smith, Timothy C. Allison, Jason C. Wilkes, Christopher Clarke, Michael Cave
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. April 2019, 141(4): 041011.
Paper No: GTP-18-1623
https://doi.org/10.1115/1.4041740
Published Online: November 16, 2018
View Article titled, The Comparison of Aerodynamic Performance Data Acquired From Thermal Measurements and a Torquemeter on a Compressor Impeller
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Topics: Flow (Dynamics), Heat, Heat losses, Impellers, Temperature, Torque, Torquemeters, Enthalpy, Steady state, Measurement uncertainty
Proceedings Papers

Experimental Validation of a Wide-Range Centrifugal Compressor Stage for Supercritical CO 2 Power Cycles

Timothy C. Allison, Natalie R. Smith, Robert Pelton, Sewoong Jung, Jason C. Wilkes
Proc. ASME. GT2018, Volume 9: Oil and Gas Applications; Supercritical CO2 Power Cycles; Wind Energy, V009T38A023, June 11–15, 2018
Publisher: American Society of Mechanical Engineers
Paper No: GT2018-77026
https://doi.org/10.1115/GT2018-77026
View Paper titled, Experimental Validation of a Wide-Range Centrifugal Compressor Stage for Supercritical CO 2 Power Cycles
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Topics: Compressors, Supercritical carbon dioxide, Thermodynamic power cycles, Design, Flow (Dynamics), Carbon dioxide, Cycles, Impellers, Transients (Dynamics), Computational fluid dynamics
Proceedings Papers

Application of Dry-Friction Whip and Whirl Solution Methods to Systems With Support Asymmetry

Jason C. Wilkes
Proc. ASME. GT2018, Volume 7B: Structures and Dynamics, V07BT34A041, June 11–15, 2018
Publisher: American Society of Mechanical Engineers
Paper No: GT2018-76991
https://doi.org/10.1115/GT2018-76991
View Paper titled, Application of Dry-Friction Whip and Whirl Solution Methods to Systems With Support Asymmetry
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Topics: Dry-friction whip and whirl, Rotors, Stators, Annulus, Clearances (Engineering)
Proceedings Papers

The Comparison of Aerodynamic Performance Data Acquired From Thermal Measurements and a Torquemeter on a Compressor Impeller

Natalie R. Smith, Christopher Clarke, Timothy C. Allison, Michael Cave, Jason C. Wilkes
Proc. ASME. GT2018, Volume 9: Oil and Gas Applications; Supercritical CO2 Power Cycles; Wind Energy, V009T27A029, June 11–15, 2018
Publisher: American Society of Mechanical Engineers
Paper No: GT2018-77016
https://doi.org/10.1115/GT2018-77016
View Paper titled, The Comparison of Aerodynamic Performance Data Acquired From Thermal Measurements and a Torquemeter on a Compressor Impeller
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Topics: Compressor impellers, Torquemeters, Heat, Heat losses, Steady state, Torque, Enthalpy, Impellers, Machinery, Measurement uncertainty
Journal Articles

Impact of Bearing Clearance on Measured Stiffness and Damping Coefficients and Thermal Performance of a High-Stiffness Generation 3 Foil Journal Bearing

Jason C. Wilkes, Jonathan Wade, Aaron Rimpel, Jeff Moore, Erik Swanson, Joseph Grieco, Jerry Brady
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. July 2018, 140(7): 072503.
Paper No: GTP-17-1107
https://doi.org/10.1115/1.4038603
Published Online: April 10, 2018
View Article titled, Impact of Bearing Clearance on Measured Stiffness and Damping Coefficients and Thermal Performance of a High-Stiffness Generation 3 Foil Journal Bearing
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Topics: Bearings, Clearances (Engineering), Damping, Stiffness, Stress
Proceedings Papers

Impact of Bearing Clearance on Measured Stiffness and Damping Coefficients and Thermal Performance of a High-Stiffness Generation 3 Foil Journal Bearing

Jason C. Wilkes, Jonathan Wade, Aaron Rimpel, Jeff Moore, Erik Swanson, Joseph Grieco, Jerry Brady
Proc. ASME. GT2016, Volume 7B: Structures and Dynamics, V07BT31A011, June 13–17, 2016
Publisher: American Society of Mechanical Engineers
Paper No: GT2016-56478
https://doi.org/10.1115/GT2016-56478
View Paper titled, Impact of Bearing Clearance on Measured Stiffness and Damping Coefficients and Thermal Performance of a High-Stiffness Generation 3 Foil Journal Bearing
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Topics: Bearings, Clearances (Engineering), Damping, Journal bearings, Stiffness, Foil bearings, Springs, Compressors, Natural gas, Stability
Proceedings Papers

Modeling a Spiral Groove Thrust Bearing Using 3-D, Two-Way Fluid Structure Interaction With Conjugate Heat Transfer

Kevin Hoopes, Jason C. Wilkes, Jeff Moore, Joseph Grieco, Kevin Passmore, Jerry Brady
Proc. ASME. GT2016, Volume 7B: Structures and Dynamics, V07BT31A035, June 13–17, 2016
Publisher: American Society of Mechanical Engineers
Paper No: GT2016-57933
https://doi.org/10.1115/GT2016-57933
View Paper titled, Modeling a Spiral Groove Thrust Bearing Using 3-D, Two-Way Fluid Structure Interaction With Conjugate Heat Transfer
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Topics: Fluid structure interaction, Heat transfer, Modeling, Thrust bearings, Fluids, Simulation, Stress, Thrust, Film thickness, Bearings
Proceedings Papers

A General Model for Two-Point Contact Dry-Friction Whip and Whirl: Further Advancements and Experimental Test Results

Jason C. Wilkes, Tim Allison
Proc. ASME. GT2015, Volume 7A: Structures and Dynamics, V07AT31A024, June 15–19, 2015
Publisher: American Society of Mechanical Engineers
Paper No: GT2015-43815
https://doi.org/10.1115/GT2015-43815
View Paper titled, A General Model for Two-Point Contact Dry-Friction Whip and Whirl: Further Advancements and Experimental Test Results
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Topics: Dry-friction whip and whirl, Rotors, Air bearings, Bushings, Failure, Magnetic bearings, Stators, Whirls
Proceedings Papers

A General Model for Two-Point Contact Dry-Friction Whip and Whirl

Jason C. Wilkes
Proc. ASME. GT2012, Volume 7: Structures and Dynamics, Parts A and B, 957-964, June 11–15, 2012
Publisher: American Society of Mechanical Engineers
Paper No: GT2012-69800
https://doi.org/10.1115/GT2012-69800
View Paper titled, A General Model for Two-Point Contact Dry-Friction Whip and Whirl
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Topics: Dry-friction whip and whirl, Rotors, Stators, Air bearings, Bushings, Computer simulation, Failure, Magnetic bearings
Proceedings Papers

Improving Tilting-Pad Journal Bearing Predictions: Part I—Model Development and Impact of Rotor-Excited Versus Bearing-Excited Impedance Coefficients

Jason C. Wilkes, Dara W. Childs
Proc. ASME. GT2012, Volume 7: Structures and Dynamics, Parts A and B, 965-978, June 11–15, 2012
Publisher: American Society of Mechanical Engineers
Paper No: GT2012-69804
https://doi.org/10.1115/GT2012-69804
View Paper titled, Improving Tilting-Pad Journal Bearing Predictions: Part I—Model Development and Impact of Rotor-Excited Versus Bearing-Excited Impedance Coefficients
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Topics: Bearings, Journal bearings, Model development, Rotors, Clearances (Engineering)
Proceedings Papers

Improving Tilting-Pad Journal Bearing Predictions: Part II—Comparison of Measured and Predicted Rotor-Pad Transfer Functions for a Rocker-Pivot Tilting-Pad Journal Bearing

Jason C. Wilkes, Dara W. Childs
Proc. ASME. GT2012, Volume 7: Structures and Dynamics, Parts A and B, 979-990, June 11–15, 2012
Publisher: American Society of Mechanical Engineers
Paper No: GT2012-69808
https://doi.org/10.1115/GT2012-69808
View Paper titled, Improving Tilting-Pad Journal Bearing Predictions: Part II—Comparison of Measured and Predicted Rotor-Pad Transfer Functions for a Rocker-Pivot Tilting-Pad Journal Bearing
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Topics: Journal bearings, Rotors, Transfer functions, Clearances (Engineering), Excitation, Probes, Strain gages, Stress, Yaw
Proceedings Papers

Tilting Pad Journal Bearings: A Discussion on Stability Calculation, Frequency Dependence, and Pad and Pivot Flexibility

Jason C. Wilkes, Dara W. Childs
Proc. ASME. GT2012, Volume 7: Structures and Dynamics, Parts A and B, 991-1006, June 11–15, 2012
Publisher: American Society of Mechanical Engineers
Paper No: GT2012-69809
https://doi.org/10.1115/GT2012-69809
View Paper titled, Tilting Pad Journal Bearings: A Discussion on Stability Calculation, Frequency Dependence, and Pad and Pivot Flexibility
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Topics: Journal bearings, Stability, Bearings, Damping, Stiffness, Clearances (Engineering), Stress, Degrees of freedom, Excitation, Operating temperature
Journal Articles

Improving Tilting-Pad Journal Bearing Predictions—Part II: Comparison of Measured and Predicted Rotor-Pad Transfer Functions for a Rocker-Pivot Tilting-Pad Journal Bearing

Jason C. Wilkes, Dara W. Childs
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. January 2013, 135(1): 012503.
Paper No: GTP-12-1250
https://doi.org/10.1115/1.4007368
Published Online: December 4, 2012
View Article titled, Improving Tilting-Pad Journal Bearing Predictions—Part II: Comparison of Measured and Predicted Rotor-Pad Transfer Functions for a Rocker-Pivot Tilting-Pad Journal Bearing
Open the PDF for Improving Tilting-Pad Journal Bearing Predictions—Part II: Comparison of Measured and Predicted Rotor-Pad Transfer Functions for a Rocker-Pivot Tilting-Pad Journal Bearing in another window
Topics: Bearings, Rotors, Transfer functions, Stress, Stiffness
Journal Articles

Improving Tilting Pad Journal Bearing Predictions—Part I: Model Development and Impact of Rotor Excited Versus Bearing Excited Impedance Coefficients

Jason C. Wilkes, Dara W. Childs
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. January 2013, 135(1): 012502.
Paper No: GTP-12-1249
https://doi.org/10.1115/1.4007367
Published Online: December 4, 2012
View Article titled, Improving Tilting Pad Journal Bearing Predictions—Part I: Model Development and Impact of Rotor Excited Versus Bearing Excited Impedance Coefficients
Open the PDF for Improving Tilting Pad Journal Bearing Predictions—Part I: Model Development and Impact of Rotor Excited Versus Bearing Excited Impedance Coefficients in another window
Topics: Bearings, Fluid films, Rotors, Stiffness
Journal Articles

Tilting Pad Journal Bearings—A Discussion on Stability Calculation, Frequency Dependence, and Pad and Pivot

Jason C. Wilkes, Dara W. Childs
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. December 2012, 134(12): 122508.
https://doi.org/10.1115/1.4007369
Published Online: October 22, 2012
View Article titled, Tilting Pad Journal Bearings—A Discussion on Stability Calculation, Frequency Dependence, and Pad and Pivot
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Topics: Bearings, Stiffness, Damping, Stress, Stability, Clearances (Engineering)
Proceedings Papers

Measured and Predicted Transfer Functions Between Rotor Motion and Pad Motion for a Rocker-Back Tilting-Pad Bearing in LOP Configuration

Jason C. Wilkes
Proc. ASME. GT2011, Volume 6: Structures and Dynamics, Parts A and B, 663-674, June 6–10, 2011
Publisher: American Society of Mechanical Engineers
Paper No: GT2011-46510
https://doi.org/10.1115/GT2011-46510
View Paper titled, Measured and Predicted Transfer Functions Between Rotor Motion and Pad Motion for a Rocker-Back Tilting-Pad Bearing in LOP Configuration
Open the PDF for Measured and Predicted Transfer Functions Between Rotor Motion and Pad Motion for a Rocker-Back Tilting-Pad Bearing in LOP Configuration in another window
Topics: Bearings, Rotors, Transfer functions, Damping, Stress, Excitation, Stiffness, Accounting, Deformation, Degrees of freedom
Journal Articles

The Numerical and Experimental Characteristics of Multimode Dry-Friction Whip and Whirl

Jason C. Wilkes, Dara W. Childs, Benjamin J. Dyck, Stephen G. Phillips
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research Papers
J. Eng. Gas Turbines Power. May 2010, 132(5): 052503.
https://doi.org/10.1115/1.3204658
Published Online: March 4, 2010
View Article titled, The Numerical and Experimental Characteristics of Multimode Dry-Friction Whip and Whirl
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Topics: Dry-friction whip and whirl, Rotors, Stators, Whirls, Simulation, Simulation models, Bearings, Friction