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Proceedings Papers

Investigation of Gas Turbine Internal Cooling Using Supercritical CO2 – Effect of Surface Roughness and Channel Aspect Ratio

Arnab Roy, Matthew Searle, Sridharan Ramesh, Douglas Straub
Proc. ASME. GT2022, Volume 9: Supercritical CO2, V009T28A026, June 13–17, 2022
Paper No: GT2022-83319
DOI: https://doi.org/10.1115/GT2022-83319
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Topics: Cooling, Gas turbines, Supercritical carbon dioxide, Surface roughness, Reynolds number, Additive manufacturing, Computational fluid dynamics, Heat transfer, Flow (Dynamics), Fluids
Proceedings Papers

Performance of Additively Manufactured Internally Cooled Airfoils for Small Industrial Gas Turbines

Doug Straub, Sridharan Ramesh, Matthew Searle, Edward Robey, Tim Floyd, Arnab Roy, Forrest E. Ames
Proc. ASME. GT2022, Volume 6B: Heat Transfer — General Interest/Additive Manufacturing Impacts on Heat Transfer; Internal Air Systems; Internal Cooling, V06BT15A028, June 13–17, 2022
Paper No: GT2022-83333
DOI: https://doi.org/10.1115/GT2022-83333
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Topics: Additive manufacturing, Airfoils, Cooling, Industrial gases, Turbines
Journal Articles

Investigation of Gas Turbine Internal Cooling Using Supercritical CO 2 —Effect of Surface Roughness and Channel Aspect Ratio

Arnab Roy, Matthew Searle, Sridharan Ramesh, Douglas Straub
Journal: Journal of Engineering for Gas Turbines and Power
Article Type: Research-Article
J. Eng. Gas Turbines Power. November 2022, 144(11): 111019.
Paper No: GTP-22-1358
DOI: https://doi.org/10.1115/1.4055497
Published Online: September 23, 2022
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Topics: Computational fluid dynamics, Cooling, Flow (Dynamics), Heat transfer, Reynolds number, Surface roughness, Friction, Simulation, Gas turbines, Sands
Journal Articles

Film Cooling Performance Prediction for Air and Supercritical CO 2

Sridharan Ramesh, Douglas Straub
Journal: Journal of Energy Resources Technology
Article Type: Research Papers
J. Energy Resour. Technol. March 2023, 145(3): 031702.
Paper No: JERT-22-1075
DOI: https://doi.org/10.1115/1.4055199
Published Online: September 7, 2022
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Topics: Coolants, Film cooling, Density, Cooling, Turbines
Proceedings Papers

Investigating Gas Turbine Internal Cooling Using Supercritical CO 2 at High Reynolds Numbers for Direct Fired Cycle Applications

Matthew Searle, Arnab Roy, James Black, Doug Straub, Sridharan Ramesh
Proc. ASME. GT2021, Volume 10: Supercritical CO2, V010T30A020, June 7–11, 2021
Paper No: GT2021-59630
DOI: https://doi.org/10.1115/GT2021-59630
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Topics: Cooling, Cycles, Gas turbines, Reynolds number, Supercritical carbon dioxide, Additive manufacturing, Computational fluid dynamics, Heat transfer, Channel flow, Coolants
Proceedings Papers

Baseline Airfoil Cooling Designs for a 5-10 MW Combined Heat and Power Turbine Application

Doug Straub, Sridharan Ramesh, Matthew Searle, Arnab Roy, James Black
Proc. ASME. GT2021, Volume 5B: Heat Transfer — General Interest; Internal Air Systems; Internal Cooling, V05BT15A009, June 7–11, 2021
Paper No: GT2021-59114
DOI: https://doi.org/10.1115/GT2021-59114
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Topics: Airfoils, Combined heat and power, Cooling, Gas turbines, Turbines
Journal Articles

Investigating Gas Turbine Internal Cooling Using Supercritical CO 2 at Higher Reynolds Numbers for Direct Fired Cycle Applications

Matthew Searle, Arnab Roy, James Black, Douglas Straub, Sridharan Ramesh
Journal: Journal of Turbomachinery
Article Type: Research Papers
J. Turbomach. January 2022, 144(1): 011007.
Paper No: TURBO-21-1148
DOI: https://doi.org/10.1115/1.4052138
Published Online: September 7, 2021
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Topics: Cooling, Flow (Dynamics), Friction, Gas turbines, Heat transfer, Reynolds number, Surface roughness, Computational fluid dynamics, Supercritical carbon dioxide, Uncertainty
Journal Articles

Scalable Heat Transfer Characterization on Film Cooled Geometries Based on Discrete Green’s Functions

Jorge Saavedra, Venkat Athmanathan, Guillermo Paniagua, Terrence Meyer, Doug Straub, James Black, Sridharan Ramesh
Journal: Journal of Turbomachinery
Article Type: Research Papers
J. Turbomach. February 2021, 143(2): 021005.
Paper No: TURBO-20-1226
DOI: https://doi.org/10.1115/1.4049613
Published Online: February 1, 2021
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Topics: Flat plates, Heat flux, Heat transfer, Temperature, Wall temperature, Flow (Dynamics), Errors, Heat, Boundary-value problems, Simulation
Proceedings Papers

Scalable Heat Transfer Characterization on Film Cooled Geometries Based on Discrete Green’s Functions

Jorge Saavedra, Venkat Athmanathan, Guillermo Paniagua, Terrence Meyer, Doug Straub, James Black, Sridharan Ramesh
Proc. ASME. GT2020, Volume 7B: Heat Transfer, V07BT12A075, September 21–25, 2020
Paper No: GT2020-16304
DOI: https://doi.org/10.1115/GT2020-16304
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Topics: Heat transfer, Heat flux, Flat plates, Temperature, Convection, Engines, Boundary-value problems, Cantilevers, Engineering simulation, Geometry
Journal Articles

Measurement of Convective Heat Transfer Coefficients With Supercritical CO 2 Using the Wilson-Plot Technique

Jim Black, Doug Straub, Ed Robey, Joe Yip, Sridharan Ramesh, Arnab Roy, Matthew Searle
Journal: Journal of Energy Resources Technology
Article Type: Research Papers
J. Energy Resour. Technol. July 2020, 142(7): 070901.
Paper No: JERT-19-1412
DOI: https://doi.org/10.1115/1.4046700
Published Online: April 8, 2020
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Topics: Convection, Flow (Dynamics), Heat, Heat exchangers, Heat transfer, Heat transfer coefficients, Supercritical carbon dioxide, Temperature, Testing, Thermodynamic power cycles
Journal Articles

Film Cooling Performance of Tripod Antivortex Injection Holes Over the Pressure and Suction Surfaces of a Nozzle Guide Vane

Sridharan Ramesh, Christopher LeBlanc, Diganta Narzary, Srinath Ekkad, Mary Anne Alvin
Journal: Journal of Thermal Science and Engineering Applications
Article Type: Research-Article
J. Thermal Sci. Eng. Appl. June 2017, 9(2): 021006.
Paper No: TSEA-15-1181
DOI: https://doi.org/10.1115/1.4035290
Published Online: January 24, 2017
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Topics: Airfoils, Coolants, Cooling, Film cooling, Flow (Dynamics), Geometry, Pressure, Suction, Heat conduction, Density
Proceedings Papers

Film Cooling Performance of Tripod Holes on the Endwall Upstream of a First Stage Nozzle Guide Vane

Bharath Viswanath Ravi, Samruddhi Deshpande, Sridharan Ramesh, Prethive Dhilip Dhilipkumar, Srinath Ekkad
Proc. ASME. IMECE2015, Volume 8B: Heat Transfer and Thermal Engineering, V08BT10A021, November 13–19, 2015
Paper No: IMECE2015-53133
DOI: https://doi.org/10.1115/IMECE2015-53133
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Topics: Film cooling, Nozzle guide vanes, Cooling, Flow (Dynamics), Gas turbines, Temperature, Thermal efficiency, Turbines, Cascades (Fluid dynamics), Coolants
Proceedings Papers

Experimental Study of Heat Transfer Augmentation in High Aspect-Ratio Channels Featuring Different Dimple Configurations

Kartikeya Tyagi, Prashant Singh, Jaideep Pandit, Sridharan Ramesh, Srinath V. Ekkad, Anil Tolpadi
Proc. ASME. GT2015, Volume 5A: Heat Transfer, V05AT11A033, June 15–19, 2015
Paper No: GT2015-43621
DOI: https://doi.org/10.1115/GT2015-43621
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Topics: Heat transfer, Diamonds, Pressure drop, Reynolds number, Computer simulation, Ducts, Flat plates, Flow (Dynamics), Geometry, Liquid crystals
Proceedings Papers

Thermo-Mechanical Analysis of Various Film Cooling Hole Geometries

Sridharan Ramesh, Christopher LeBlanc, Srinath Ekkad, Mary Anne Alvin
Proc. ASME. HT2013, Volume 3: Gas Turbine Heat Transfer; Transport Phenomena in Materials Processing and Manufacturing; Heat Transfer in Electronic Equipment; Symposium in Honor of Professor Richard Goldstein; Symposium in Honor of Prof. Spalding; Symposium in Honor of Prof. Arthur E. Bergles, V003T08A011, July 14–19, 2013
Paper No: HT2013-17423
DOI: https://doi.org/10.1115/HT2013-17423
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Topics: Film cooling, Thermomechanics, Blades, Cooling, Stress, Temperature, Computational fluid dynamics, Design, Alloys, Coolants
Proceedings Papers

Experimental and Computational Evaluation of Flow Characteristics for Advanced Film Cooling Hole Geometries

David Gomez-Ramirez, Shreyas Srinivasan, Sridharan Ramesh, Marco Miranda, Srinath V. Ekkad, Mary Anne Alvin
Proc. ASME. HT2013, Volume 3: Gas Turbine Heat Transfer; Transport Phenomena in Materials Processing and Manufacturing; Heat Transfer in Electronic Equipment; Symposium in Honor of Professor Richard Goldstein; Symposium in Honor of Prof. Spalding; Symposium in Honor of Prof. Arthur E. Bergles, V003T08A012, July 14–19, 2013
Paper No: HT2013-17463
DOI: https://doi.org/10.1115/HT2013-17463
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Topics: Film cooling, Flow (Dynamics), Computational fluid dynamics, Cooling, Vortices, Blades, Coolants, Design, Flat plates, Separation (Technology)
Proceedings Papers

Effect of Hole Exit Shaping on Film Cooling Performance for Tripod Hole Injection Over a Flat Surface

Christopher N. LeBlanc, Sridharan Ramesh, Srinath V. Ekkad, Mary Anne Alvin
Proc. ASME. GT2013, Volume 3B: Heat Transfer, V03BT13A011, June 3–7, 2013
Paper No: GT2013-94456
DOI: https://doi.org/10.1115/GT2013-94456
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Topics: Film cooling, Coolants, Flow (Dynamics), Heat transfer coefficients, Cooling, Flat plates, Temperature, Thermography, Transients (Dynamics)
Proceedings Papers

Tripod Hole Geometry Performance for a Vane Suction Surface Near Throat Location

Sridharan Ramesh, Chris LeBlanc, Srinath V. Ekkad, Mary Anne Alvin
Proc. ASME. GT2013, Volume 3B: Heat Transfer, V03BT13A012, June 3–7, 2013
Paper No: GT2013-94459
DOI: https://doi.org/10.1115/GT2013-94459
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Topics: Geometry, Suction, Airfoils, Film cooling, Cooling, Cascades (Fluid dynamics), Engines, Flow (Dynamics), Steady state, Wind tunnels
Proceedings Papers

Effect of Breakout Angle on Tripod Injection Hole Geometries on Flat Plate Film Cooling

Christopher LeBlanc, Sridharan Ramesh, Srinath Ekkad, Mary Anne Alvin
Proc. ASME. IMECE2012, Volume 7: Fluids and Heat Transfer, Parts A, B, C, and D, 1995-2002, November 9–15, 2012
Paper No: IMECE2012-89346
DOI: https://doi.org/10.1115/IMECE2012-89346
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Topics: Film cooling, Flat plates, Design, Coolants, Density, Carbon dioxide, Cooling, Fluids, Steady state, Thermography
Proceedings Papers

Heat Transfer Enhancement in Narrow Diverging Channels

Justin Lamont, Sridharan Ramesh, Srinath V. Ekkad, Anil Tolpadi, Christopher Kaminski, Samir Salamah
Proc. ASME. GT2012, Volume 4: Heat Transfer, Parts A and B, 185-191, June 11–15, 2012
Paper No: GT2012-68486
DOI: https://doi.org/10.1115/GT2012-68486
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Topics: Heat transfer, Heat transfer coefficients, Pressure drop, Liquid crystals, Transients (Dynamics), Cooling, Design, Ducts, Geometry, Reynolds number
Journal Articles

Heat Transfer Enhancement in Narrow Diverging Channels

Justin Lamont, Sridharan Ramesh, Srinath V. Ekkad, Anil Tolpadi, Christopher Kaminski, Samir Salamah
Journal: Journal of Turbomachinery
Article Type: Research-Article
J. Turbomach. July 2013, 135(4): 041017.
Paper No: TURBO-12-1145
DOI: https://doi.org/10.1115/1.4007740
Published Online: June 5, 2013
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Topics: Geometry, Heat transfer, Pressure drop, Heat transfer coefficients, Flow (Dynamics)