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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

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
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

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
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

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
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
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