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Journal Articles

Investigation of Nonlinear Dynamic Behaviors of Vertical Rotor System Supported by Aerostatic Bearings

Shun Qiu, Changlei Ke, Kongrong Li, Xiaohua Zhang, Nan Peng, Liqiang Liu
Journal: Journal of Computational and Nonlinear Dynamics
Publisher: ASME
Article Type: Research-Article
J. Comput. Nonlinear Dynam. January 2025, 20(1): 011007.
Paper No: CND-24-1131
https://doi.org/10.1115/1.4067011
Published Online: November 27, 2024
View Article titled, Investigation of Nonlinear Dynamic Behaviors of Vertical Rotor System Supported by Aerostatic Bearings
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Topics: Bearings, Rotors
Journal Articles

Development of Large-Diameter Hybrid Film-Riding Seals for Supercritical Carbon Dioxide Turbines

Rahul A. Bidkar, Uttara Kumar, Deepak Trivedi, Xiaohua Zhang, Collin Rambacher, Aaron Rimpel, Thomas Kerr, Jeremy Johnson
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. February 2025, 147(2): 021031.
Paper No: GTP-24-1409
https://doi.org/10.1115/1.4067180
Published Online: November 20, 2024
View Article titled, Development of Large-Diameter Hybrid Film-Riding Seals for Supercritical Carbon Dioxide Turbines
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Topics: Bearings, Design, Film thickness, Fluids, Leakage, Pressure, Rotors, Supercritical carbon dioxide, Temperature, Turbines
Proceedings Papers

Development of Large-Diameter Hybrid Film-Riding Seals for sCO 2 Turbines

Rahul A. Bidkar, Uttara Kumar, Deepak Trivedi, Xiaohua Zhang, Collin Rambacher, Aaron Rimpel, Thomas Kerr, Jeremy Johnson
Proc. ASME. GT2024, Volume 8: Heat Transfer: Internal Air Systems; Heat Transfer: Internal Cooling; Industrial and Cogeneration, V008T14A004, June 24–28, 2024
Publisher: American Society of Mechanical Engineers
Paper No: GT2024-123289
https://doi.org/10.1115/GT2024-123289
View Paper titled, Development of Large-Diameter Hybrid Film-Riding Seals for sCO 2 Turbines
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Topics: Turbines, Temperature, Clearances (Engineering), Film thickness, Fluids, Carbon dioxide, Design, Rotors, Computational fluid dynamics, Deformation
Proceedings Papers

Thermal Performance Characterization of Dry Gas Seals in a sCO 2 Compressor

Rahul A. Bidkar, Uttara Kumar, Xiaohua Zhang, Nora Molino, Joshua Neveu, John Klaerner, Jeremy Johnson, J. Jeffrey Moore
Proc. ASME. GT2024, Volume 11: Supercritical CO2, V011T28A035, June 24–28, 2024
Publisher: American Society of Mechanical Engineers
Paper No: GT2024-128872
https://doi.org/10.1115/GT2024-128872
View Paper titled, Thermal Performance Characterization of Dry Gas Seals in a sCO 2 Compressor
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Topics: Compressors, Heat transfer, Performance characterization, Turbomachinery, Flow (Dynamics), Temperature, Cavities, Failure, Supercritical carbon dioxide, Accounting
Proceedings Papers

Super-Critical Carbon Dioxide Power Cycle for Waste Heat Recovery Utilizing Hermetic Oil-Free Turbomachinery: Cycle and Conceptual Turbomachinery Design

Bugra Ertas, Joseph Zierer, Aaron McClung, Dave Torrey, Rahul A. Bidkar, Doug Hofer, Vandana Rallabandi, Rajkeshar Singh, Xiaohua Zhang
Proc. ASME. GT2023, Volume 12: Supercritical CO2, V012T28A033, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-104245
https://doi.org/10.1115/GT2023-104245
View Paper titled, Super-Critical Carbon Dioxide Power Cycle for Waste Heat Recovery Utilizing Hermetic Oil-Free Turbomachinery: Cycle and Conceptual Turbomachinery Design
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Topics: Carbon dioxide, Cycles, Design, Heat recovery, Thermodynamic power cycles, Turbomachinery, Bearings, Gas turbines, Organic Rankine cycle, Power systems (Machinery)
Proceedings Papers

Test Rig Concept for Evaluating the Performance of a CO 2 Immersed Electromechanical Rotor System Utilizing Gas Bearings: Part-2 Thermal Systems & Flow Loop Design

Rahul A. Bidkar, Uttara Kumar, Xiaohua Zhang, Neelesh Sarawate, John Powers, Nevin M. Anandika, Bugra Ertas
Proc. ASME. GT2023, Volume 12: Supercritical CO2, V012T28A028, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-103989
https://doi.org/10.1115/GT2023-103989
View Paper titled, Test Rig Concept for Evaluating the Performance of a CO 2 Immersed Electromechanical Rotor System Utilizing Gas Bearings: Part-2 Thermal Systems & Flow Loop Design
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Topics: Carbon dioxide, Design, Flow (Dynamics), Gas bearings, Machinery, Rotors, Thermal analysis, Thermal systems, Turbomachinery
Proceedings Papers

Preliminary Study of Function Determination and Capacity of ACP600’s Reactor Emergency Borating System

Shu Zhang, Xiaohua Zhang
Proc. ASME. ICONE24, Volume 2: Smart Grids, Grid Stability, and Offsite and Emergency Power; Advanced and Next Generation Reactors, Fusion Technology; Safety, Security, and Cyber Security; Codes, Standards, Conformity Assessment, Licensing, and Regulatory Issues, V002T07A001, June 26–30, 2016
Publisher: American Society of Mechanical Engineers
Paper No: ICONE24-60024
https://doi.org/10.1115/ICONE24-60024
View Paper titled, Preliminary Study of Function Determination and Capacity of ACP600’s Reactor Emergency Borating System
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Topics: Emergencies, Design, Safety, Nuclear power stations, Accidents, Boron, China, Concretes, Feedback, Pressurized water reactors
Proceedings Papers

Dynamic Servo Control for Underactuated Mechanical Systems

Hongtai Cheng, Heping Chen, Xiaohua Zhang, Hongjun Chen
Proc. ASME. IMECE2012, Volume 4: Dynamics, Control and Uncertainty, Parts A and B, 315-320, November 9–15, 2012
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2012-87659
https://doi.org/10.1115/IMECE2012-87659
View Paper titled, Dynamic Servo Control for Underactuated Mechanical Systems
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Topics: Servomechanisms, Trajectories (Physics), Control equipment, Engineering prototypes