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Proceedings Papers

NASA HECC Geometry and Performance Review Part 2: Geometric Differences Between the As-Manufactured and Design-Intent Impeller Geometry and Their Effects on the Vaneless Diffuser Configuration Performance

Gregorio Robles Vega, Alec J. Bosshart, Michael Ni, Ron-Ho Ni, Herbert M. Harrison, Tammy Nguyen-Huynh
Proc. ASME. GT2024, Volume 12D: Turbomachinery — Multidisciplinary Design Approaches, Optimization, and Uncertainty Quantification; Radial Turbomachinery Aerodynamics; Unsteady Flows in Turbomachinery, V12DT35A012, June 24–28, 2024
Publisher: American Society of Mechanical Engineers
Paper No: GT2024-125360
https://doi.org/10.1115/GT2024-125360
View Paper titled, NASA HECC Geometry and Performance Review Part 2: Geometric Differences Between the As-Manufactured and Design-Intent Impeller Geometry and Their Effects on the Vaneless Diffuser Configuration Performance
Open the PDF for NASA HECC Geometry and Performance Review Part 2: Geometric Differences Between the As-Manufactured and Design-Intent Impeller Geometry and Their Effects on the Vaneless Diffuser Configuration Performance in another window
Topics: Design, Geometry, Impellers, NASA, Performance evaluation, Vaneless diffusers, Blades, Computer simulation, Clearances (Engineering), Compressors
Proceedings Papers

NASA HECC Geometry and Performance Review Part 1: Validation of a Computational Model for the Vaneless Diffuser Configuration With As-Manufactured Impeller Geometry

Gregorio Robles Vega, Alec J. Bosshart, Michael Ni, Ron-Ho Ni, Herbert M. Harrison, Tammy Nguyen-Huynh
Proc. ASME. GT2024, Volume 12D: Turbomachinery — Multidisciplinary Design Approaches, Optimization, and Uncertainty Quantification; Radial Turbomachinery Aerodynamics; Unsteady Flows in Turbomachinery, V12DT35A011, June 24–28, 2024
Publisher: American Society of Mechanical Engineers
Paper No: GT2024-125128
https://doi.org/10.1115/GT2024-125128
View Paper titled, NASA HECC Geometry and Performance Review Part 1: Validation of a Computational Model for the Vaneless Diffuser Configuration With As-Manufactured Impeller Geometry
Open the PDF for NASA HECC Geometry and Performance Review Part 1: Validation of a Computational Model for the Vaneless Diffuser Configuration With As-Manufactured Impeller Geometry in another window
Topics: Compressors, Computer simulation, Geometry, Impellers, NASA, Performance evaluation, Vaneless diffusers, Engineering simulation, Simulation, Computer-aided design
Proceedings Papers

Part I: Validation and Verification of CFD Analysis for NASA SDT Transonic Fan Stage Test Rig

Gregorio Robles Vega, Daryl Y. Lee, Michael Ni, Ron-Ho Ni
Proc. ASME. GT2023, Volume 13A: Turbomachinery — Axial Flow Fan and Compressor Aerodynamics, V13AT29A041, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-103856
https://doi.org/10.1115/GT2023-103856
View Paper titled, Part I: Validation and Verification of CFD Analysis for NASA SDT Transonic Fan Stage Test Rig
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Topics: Computational fluid dynamics, NASA, Design, Geometry, Pressure, Turbomachinery, Approximation, Engineering simulation, Reynolds-averaged Navier–Stokes equations, Rotors
Proceedings Papers

Part II: Validation and Verification of CFD Analysis for NASA SDT Transonic Fan Stage Coupled With Nacelle

Daryl Y. Lee, Gregorio Robles Vega, Michael Ni, Ron-Ho Ni
Proc. ASME. GT2023, Volume 13A: Turbomachinery — Axial Flow Fan and Compressor Aerodynamics, V13AT29A042, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-103871
https://doi.org/10.1115/GT2023-103871
View Paper titled, Part II: Validation and Verification of CFD Analysis for NASA SDT Transonic Fan Stage Coupled With Nacelle
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Topics: Computational fluid dynamics, NASA, Design, Turbomachinery, Engines, Cycles, Modeling, Aircraft, Boundary layers, Engineering simulation
Proceedings Papers

LES Modeling of High-Lift High-Work LP Turbine Profiles: Part I: Approach

Michael Ni, Ron-Ho Ni, John P. Clark
Proc. ASME. GT2023, Volume 13B: Turbomachinery — Axial Flow Turbine Aerodynamics, V13BT30A019, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-102625
https://doi.org/10.1115/GT2023-102625
View Paper titled, LES Modeling of High-Lift High-Work LP Turbine Profiles: Part I: Approach
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Topics: Modeling, Turbines, Reynolds number, Design, Flow (Dynamics), Turbulence, Engineering simulation, Physics, Pressure, Simulation
Proceedings Papers

LES Modeling of High-Lift High-Work LPT Blades: Part II—Validation and Application

Jared Kerestes, Christopher Marks, John Clark, Mitch Wolff, Ron-Ho Ni, Nathan Fletcher
Proc. ASME. GT2023, Volume 13B: Turbomachinery — Axial Flow Turbine Aerodynamics, V13BT30A009, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-101950
https://doi.org/10.1115/GT2023-101950
View Paper titled, LES Modeling of High-Lift High-Work LPT Blades: Part II—Validation and Application
Open the PDF for LES Modeling of High-Lift High-Work LPT Blades: Part II—Validation and Application in another window
Topics: Blades, Modeling, Design, Computational fluid dynamics, Reynolds-averaged Navier–Stokes equations, Turbines, Separation (Technology), Bubbles, Cascades (Fluid dynamics), Engineering simulation
Proceedings Papers

Numerical Observations of a Stall Phenomenon in the NASA CC3 Compressor

Michael Ni, Gregorio Robles Vega, Ron Ho Ni, John Clark, Michael List
Proc. ASME. GT2022, Volume 10C: Turbomachinery — Design Methods and CFD Modeling for Turbomachinery; Ducts, Noise, and Component Interactions, V10CT32A004, June 13–17, 2022
Publisher: American Society of Mechanical Engineers
Paper No: GT2022-78911
https://doi.org/10.1115/GT2022-78911
View Paper titled, Numerical Observations of a Stall Phenomenon in the NASA CC3 Compressor
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Topics: Compressors, NASA, Engineering simulation, Simulation, Flow (Dynamics), Annulus, Approximation, Design, Diffusers, Numerical analysis
Proceedings Papers

Forced Response Prediction of Gas Turbine Rotor Blades

Gary R. Hilbert, Ron-Ho Ni, Ronald K. Takahashi
Proc. ASME. IMECE97, Analysis and Design Issues for Modern Aerospace Vehicles, 491-498, November 16–21, 1997
Publisher: American Society of Mechanical Engineers
Paper No: IMECE1997-0750
https://doi.org/10.1115/IMECE1997-0750
View Paper titled, Forced Response Prediction of Gas Turbine Rotor Blades
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Topics: Blades, Gas turbines, Rotors, Airfoils, High cycle fatigue, Stress, Computational fluid dynamics, Engines, Failure, Resonance
Journal Articles

Effects of Downstream Vane Bowing and Asymmetry on Unsteadiness in a Transonic Turbine

John P. Clark, Richard J. Anthony, Michael K. Ooten, John M. Finnegan, P. Dean Johnson, Ron-Ho Ni
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research-Article
J. Turbomach. October 2018, 140(10): 101006.
Paper No: TURBO-18-1160
https://doi.org/10.1115/1.4040998
Published Online: September 28, 2018
View Article titled, Effects of Downstream Vane Bowing and Asymmetry on Unsteadiness in a Transonic Turbine
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Topics: Airfoils, Blades, Design, Pressure, Shock (Mechanics), Suction, Turbines, Simulation
Proceedings Papers

Effects of Downstream Vane Bowing and Asymmetry on Unsteadiness in a Transonic Turbine

John P. Clark, Richard J. Anthony, Michael K. Ooten, John M. Finnegan, P. Dean Johnson, Ron-Ho Ni
Proc. ASME. GT2018, Volume 2A: Turbomachinery, V02AT45A029, June 11–15, 2018
Publisher: American Society of Mechanical Engineers
Paper No: GT2018-76735
https://doi.org/10.1115/GT2018-76735
View Paper titled, Effects of Downstream Vane Bowing and Asymmetry on Unsteadiness in a Transonic Turbine
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Topics: Turbines, Blades, Design, Shock (Mechanics), Turbine blades, Airfoils, Annulus, Cycles, Engineering simulation, Gas turbines
Journal Articles

The Effect of Manufacturing Variations on Unsteady Interaction in a Transonic Turbine

John P. Clark, Joseph A. Beck, Alex A. Kaszynski, Angela Still, Ron-Ho Ni
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research-Article
J. Turbomach. May 2018, 140(6): 061007.
Paper No: TURBO-17-1197
https://doi.org/10.1115/1.4039361
Published Online: April 30, 2018
View Article titled, The Effect of Manufacturing Variations on Unsteady Interaction in a Transonic Turbine
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Topics: Airfoils, Blades, Computational fluid dynamics, Geometry, Manufacturing, Pressure, Turbines, Shock (Mechanics), Wheels, Design
Proceedings Papers

The Effect of Manufacturing Variations on Unsteady Interaction in a Transonic Turbine

John P. Clark, Joseph A. Beck, Alex A. Kaszynski, Angela Still, Ron-Ho Ni
Proc. ASME. GT2017, Volume 2B: Turbomachinery, V02BT41A029, June 26–30, 2017
Publisher: American Society of Mechanical Engineers
Paper No: GT2017-64075
https://doi.org/10.1115/GT2017-64075
View Paper titled, The Effect of Manufacturing Variations on Unsteady Interaction in a Transonic Turbine
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Topics: Manufacturing, Turbines, Computational fluid dynamics, Blades, Geometry, Turbine blades, Airfoils, Algorithms, Artificial neural networks, Casting
Proceedings Papers

Aerodynamic Damping Predictions for Oscillating Airfoils in Cascades Using Moving Meshes

Ron Ho Ni, William Humber, Michael Ni, Vincent R. Capece, Michael Ooten, John Clark
Proc. ASME. GT2016, Volume 7B: Structures and Dynamics, V07BT34A012, June 13–17, 2016
Publisher: American Society of Mechanical Engineers
Paper No: GT2016-57017
https://doi.org/10.1115/GT2016-57017
View Paper titled, Aerodynamic Damping Predictions for Oscillating Airfoils in Cascades Using Moving Meshes
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Topics: Airfoils, Damping, Flow (Dynamics), Cascades (Fluid dynamics), Modeling, Numerical analysis, Pressure, Shock waves, Suction, Turbomachinery
Proceedings Papers

Comparison of Conjugate Heat Transfer Analysis of Flat Plate Film Cooling Arrays Against Experimental Data

William Humber, Ron-Ho Ni, Jamie Johnson, John Clark, Paul King
Proc. ASME. GT2015, Volume 5A: Heat Transfer, V05AT10A006, June 15–19, 2015
Publisher: American Society of Mechanical Engineers
Paper No: GT2015-42398
https://doi.org/10.1115/GT2015-42398
View Paper titled, Comparison of Conjugate Heat Transfer Analysis of Flat Plate Film Cooling Arrays Against Experimental Data
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Topics: Film cooling, Flat plates, Heat transfer, Cooling, Engineering simulation, Geometry, Simulation, Flow (Dynamics), Fluids, Plates (structures)
Proceedings Papers

Performance Estimation of a Turbine Under Partial-Admission and Flow Pulsation Conditions at Inlet

Ron Ho Ni, William Humber, Michael Ni, Rolf Sondergaard, Mike Ooten
Proc. ASME. GT2013, Volume 6C: Turbomachinery, V06CT42A019, June 3–7, 2013
Publisher: American Society of Mechanical Engineers
Paper No: GT2013-94811
https://doi.org/10.1115/GT2013-94811
View Paper titled, Performance Estimation of a Turbine Under Partial-Admission and Flow Pulsation Conditions at Inlet
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Topics: Flow (Dynamics), Turbines, Entropy, Pressure, Rotors, Temperature, Flow simulation, Fluids
Proceedings Papers

Comparison of Predictions From Conjugate Heat Transfer Analysis of a Film-Cooled Turbine Vane to Experimental Data

Ron-Ho Ni, William Humber, George Fan, John P. Clark, Richard J. Anthony, Jamie J. Johnson
Proc. ASME. GT2013, Volume 3B: Heat Transfer, V03BT11A013, June 3–7, 2013
Publisher: American Society of Mechanical Engineers
Paper No: GT2013-94716
https://doi.org/10.1115/GT2013-94716
View Paper titled, Comparison of Predictions From Conjugate Heat Transfer Analysis of a Film-Cooled Turbine Vane to Experimental Data
Open the PDF for Comparison of Predictions From Conjugate Heat Transfer Analysis of a Film-Cooled Turbine Vane to Experimental Data in another window
Topics: Heat transfer, Turbines, Heat flux, Metals, Temperature, Air Force, Boundary-value problems, Fluids, Gages, Root cause analysis
Proceedings Papers

Conjugate Heat Transfer Analysis for a Film-Cooled Turbine Vane

Ron Ho Ni, William Humber, George Fan, P. Dean Johnson, Jim Downs, J. P. Clark, P. J. Koch
Proc. ASME. GT2011, Volume 5: Heat Transfer, Parts A and B, 423-434, June 6–10, 2011
Publisher: American Society of Mechanical Engineers
Paper No: GT2011-45920
https://doi.org/10.1115/GT2011-45920
View Paper titled, Conjugate Heat Transfer Analysis for a Film-Cooled Turbine Vane
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Topics: Heat transfer, Turbines, Fluids, Metals, Temperature, Air Force, Airfoils, Computation, Computer simulation, Cooling
Journal Articles

A Rational Analysis of Periodic Flow Perturbation in Supersonic Two-Dimensional Cascade

Ron-Ho Ni
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research Papers
J. Eng. Gas Turbines Power. July 1979, 101(3): 431–439.
https://doi.org/10.1115/1.3446596
Published Online: July 1, 1979
View Article titled, A Rational Analysis of Periodic Flow Perturbation in Supersonic Two-Dimensional Cascade
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Topics: Cascades (Fluid dynamics), Flow (Dynamics), Blades, Flat plates, Harmonic motion, Integral equations, Oscillations, Supersonic flow, Unsteady flow, Waves