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Proceedings Papers

Passive Controls of Tip Clearance Flow in a Transonic Compressor for Stall Margin Improvement: Common Flow Physics

Chunill Hah
Proc. ASME. GT2023, Volume 13A: Turbomachinery — Axial Flow Fan and Compressor Aerodynamics, V13AT29A007, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-101077
https://doi.org/10.1115/GT2023-101077
View Paper titled, Passive Controls of Tip Clearance Flow in a Transonic Compressor for Stall Margin Improvement: Common Flow Physics
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Topics: Clearances (Engineering), Compressors, Flow (Dynamics), Passive control, Physics, Leakage flows, Design, Blades, Pressure, Suction
Journal Articles

Stall Margin Improvement in a Transonic Compressor With a Casing Treatment: Flow Mechanism

Chunill Hah
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. April 2023, 145(4): 041004.
Paper No: TURBO-22-1217
https://doi.org/10.1115/1.4055678
Published Online: November 4, 2022
View Article titled, Stall Margin Improvement in a Transonic Compressor With a Casing Treatment: Flow Mechanism
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Topics: Compressors, Design, Flow (Dynamics), Blades
Proceedings Papers

Stall Margin Improvement in a Transonic Compressor With a Casing Treatment: Flow Mechanism

Chunill Hah
Proc. ASME. GT2022, Volume 10A: Turbomachinery — Axial Flow Fan and Compressor Aerodynamics, V10AT29A039, June 13–17, 2022
Publisher: American Society of Mechanical Engineers
Paper No: GT2022-83363
https://doi.org/10.1115/GT2022-83363
View Paper titled, Stall Margin Improvement in a Transonic Compressor With a Casing Treatment: Flow Mechanism
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Topics: Compressors, Flow (Dynamics), Leakage flows, Collisions (Physics), Design, Blades, Delays, Fluids, Large eddy simulation, Leakage
Proceedings Papers

Flow Physics in a Large Rotor Tip Gap in a Multi-Stage Axial Compressor

Chunill Hah
Proc. ASME. GT2021, Volume 2A: Turbomachinery — Axial Flow Fan and Compressor Aerodynamics, V02AT31A015, June 7–11, 2021
Publisher: American Society of Mechanical Engineers
Paper No: GT2021-58745
https://doi.org/10.1115/GT2021-58745
View Paper titled, Flow Physics in a Large Rotor Tip Gap in a Multi-Stage Axial Compressor
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Topics: Compressors, Flow (Dynamics), Physics, Rotors, Eddies (Fluid dynamics), Viscosity, Pressure, Turbulence, Blades, Anisotropy
Journal Articles

The Inner Workings of Axial Casing Grooves in a One and a Half Stage Axial Compressor With a Large Rotor Tip Gap: Changes in Stall Margin and Efficiency

Chunill Hah
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research-Article
J. Turbomach. January 2019, 141(1): 011001.
Paper No: TURBO-18-1152
https://doi.org/10.1115/1.4041133
Published Online: October 17, 2018
View Article titled, The Inner Workings of Axial Casing Grooves in a One and a Half Stage Axial Compressor With a Large Rotor Tip Gap: Changes in Stall Margin and Efficiency
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Topics: Compressors, Flow (Dynamics), Rotors, Blades, Pressure, Design
Proceedings Papers

The Inner Workings of Axial Casing Grooves in a One and a Half Stage Axial Compressor With a Large Rotor Tip Gap: Changes in Stall Margin and Efficiency

Chunill Hah
Proc. ASME. GT2018, Volume 2A: Turbomachinery, V02AT39A001, June 11–15, 2018
Publisher: American Society of Mechanical Engineers
Paper No: GT2018-75040
https://doi.org/10.1115/GT2018-75040
View Paper titled, The Inner Workings of Axial Casing Grooves in a One and a Half Stage Axial Compressor With a Large Rotor Tip Gap: Changes in Stall Margin and Efficiency
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Topics: Compressors, Rotors, Flow (Dynamics), Boundary layers, Clearances (Engineering), Blades, Leakage, Flow visualization, Large eddy simulation, Pressure
Proceedings Papers

Impact of Wake Dispersion on Axial Compressor Performance

Chunill Hah
Proc. ASME. GT2017, Volume 2A: Turbomachinery, V02AT39A001, June 26–30, 2017
Publisher: American Society of Mechanical Engineers
Paper No: GT2017-63020
https://doi.org/10.1115/GT2017-63020
View Paper titled, Impact of Wake Dispersion on Axial Compressor Performance
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Topics: Compressors, Wakes, Rotors, Pressure, Stators, Blades, Boundary layers, Chords (Trusses), Clearances (Engineering), Flow (Dynamics)
Journal Articles

Effects of Double-Leakage Tip Clearance Flow on the Performance of a Compressor Stage With a Large Rotor Tip Gap

Chunill Hah
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research-Article
J. Turbomach. June 2017, 139(6): 061006.
Paper No: TURBO-16-1291
https://doi.org/10.1115/1.4035521
Published Online: February 1, 2017
View Article titled, Effects of Double-Leakage Tip Clearance Flow on the Performance of a Compressor Stage With a Large Rotor Tip Gap
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Topics: Clearances (Engineering), Compressors, Design, Flow (Dynamics), Leakage, Rotors, Pressure, Vortices
Proceedings Papers

Effects of Double-Leakage Tip Clearance Flow on the Performance of a Compressor Stage With a Large Rotor Tip Gap

Chunill Hah
Proc. ASME. GT2016, Volume 2A: Turbomachinery, V02AT37A005, June 13–17, 2016
Publisher: American Society of Mechanical Engineers
Paper No: GT2016-56050
https://doi.org/10.1115/GT2016-56050
View Paper titled, Effects of Double-Leakage Tip Clearance Flow on the Performance of a Compressor Stage With a Large Rotor Tip Gap
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Topics: Clearances (Engineering), Compressors, Flow (Dynamics), Leakage, Rotors, Vortices, Blades, Pressure, Ropes, Design
Proceedings Papers

Investigation of Unsteady Tip Clearance Flow in a Low-Speed One and Half Stage Axial Compressor With LES and PIV

Chunill Hah, Michael Hathaway, Joseph Katz, David Tan
Proc. ASME. AJKFluids2015, Volume 1: Symposia, V001T02A002, July 26–31, 2015
Publisher: American Society of Mechanical Engineers
Paper No: AJKFluids2015-2061
https://doi.org/10.1115/AJKFluids2015-2061
View Paper titled, Investigation of Unsteady Tip Clearance Flow in a Low-Speed One and Half Stage Axial Compressor With LES and PIV
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Topics: Clearances (Engineering), Compressors, Flow (Dynamics), Vortices, Blades, Rotors, Design, Channel flow, Chords (Trusses), Shear (Mechanics)
Proceedings Papers

Effects of Unsteady Flow Interactions on the Performance of a Highly-Loaded Transonic Compressor Stage

Chunill Hah
Proc. ASME. GT2015, Volume 2A: Turbomachinery, V02AT37A037, June 15–19, 2015
Publisher: American Society of Mechanical Engineers
Paper No: GT2015-43389
https://doi.org/10.1115/GT2015-43389
View Paper titled, Effects of Unsteady Flow Interactions on the Performance of a Highly-Loaded Transonic Compressor Stage
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Topics: Compressors, Unsteady flow, Stators, Pressure, Blades, Wakes, Rotors, Flow (Dynamics), Reynolds-averaged Navier–Stokes equations, Suction
Proceedings Papers

A Viscous Flow Study of Shock-Boundary Layer Interaction, Radial Transport, and Wake Development in a Transonic Compressor

Chunill Hah, Lonnie Reid
Proc. ASME. GT1991, Volume 1: Turbomachinery, V001T01A022, June 3–6, 1991
Publisher: American Society of Mechanical Engineers
Paper No: 91-GT-069
https://doi.org/10.1115/91-GT-069
View Paper titled, A Viscous Flow Study of Shock-Boundary Layer Interaction, Radial Transport, and Wake Development in a Transonic Compressor
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Topics: Compressors, Shock (Mechanics), Viscous flow, Wakes, Flow (Dynamics), Design, Particulate matter, Flow separation, Lasers, Navier-Stokes equations
Proceedings Papers

Three-Dimensional Flow Phenomena in a Transonic, High-Through-Flow, Axial-Flow Compressor Stage

William W. Copenhaver, Chunill Hah, Steven L. Puterbaugh
Proc. ASME. GT1992, Volume 1: Turbomachinery, V001T01A064, June 1–4, 1992
Publisher: American Society of Mechanical Engineers
Paper No: 92-GT-169
https://doi.org/10.1115/92-GT-169
View Paper titled, Three-Dimensional Flow Phenomena in a Transonic, High-Through-Flow, Axial-Flow Compressor Stage
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Topics: Axial flow, Compressors, Flow (Dynamics), Rotors, Stators, Viscous flow, Blades, Pressure transducers, Probes
Proceedings Papers

The Effect of Tip Clearance on a Swept Transonic Compressor Rotor

William W. Copenhaver, Ellen R. Mayhew, Chunill Hah
Proc. ASME. GT1994, Volume 1: Turbomachinery, V001T01A124, June 13–16, 1994
Publisher: American Society of Mechanical Engineers
Paper No: 94-GT-363
https://doi.org/10.1115/94-GT-363
View Paper titled, The Effect of Tip Clearance on a Swept Transonic Compressor Rotor
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Topics: Clearances (Engineering), Compressors, Rotors, Flow (Dynamics), Shock (Mechanics), Aerodynamics, Blades, Chords (Trusses), Modeling, Numerical analysis
Proceedings Papers

Flow Analyses in a Single-Stage Propulsion Pump

Yu-Tai Lee, Chunill Hah, James Loellbach
Proc. ASME. GT1994, Volume 1: Turbomachinery, V001T01A049, June 13–16, 1994
Publisher: American Society of Mechanical Engineers
Paper No: 94-GT-139
https://doi.org/10.1115/94-GT-139
View Paper titled, Flow Analyses in a Single-Stage Propulsion Pump
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Topics: Flow (Dynamics), Propulsion, Pumps, Turbulence, Rotors, Blades, Boundary layers, Eddies (Fluid dynamics), Numerical analysis, Stators
Proceedings Papers

A Three-Dimensional Shock Loss Model Applied to an Aft-Swept, Transonic Compressor Rotor

Steven L. Puterbaugh, William W. Copenhaver, Chunill Hah, Arthur J. Wennerstrom
Proc. ASME. GT1996, Volume 1: Turbomachinery, V001T01A088, June 10–13, 1996
Publisher: American Society of Mechanical Engineers
Paper No: 96-GT-354
https://doi.org/10.1115/96-GT-354
View Paper titled, A Three-Dimensional Shock Loss Model Applied to an Aft-Swept, Transonic Compressor Rotor
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Topics: Compressors, Rotors, Shock (Mechanics), Design, Flow (Dynamics), Geometry, Pressure, Airfoils, Design methodology
Proceedings Papers

Effects of Inlet Distortion on the Flow Field in a Transonic Compressor Rotor

Chunill Hah, Douglas C. Rabe, Thomas J. Sullivan, Aspi R. Wadia
Proc. ASME. GT1996, Volume 1: Turbomachinery, V001T01A135, June 10–13, 1996
Publisher: American Society of Mechanical Engineers
Paper No: 96-GT-547
https://doi.org/10.1115/96-GT-547
View Paper titled, Effects of Inlet Distortion on the Flow Field in a Transonic Compressor Rotor
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Topics: Compressors, Flow (Dynamics), Rotors, Blades, Pressure, Shock (Mechanics), Boundary layers, Viscous flow, Boundary-value problems, Chords (Trusses)
Proceedings Papers

Numerical Study of the Tip Clearance Flow Development in a Propulsion Pump Stage

Yu-Tai Lee, Chunill Hah, James Loellbach
Proc. ASME. TA1996, ASME 1996 Turbo Asia Conference, V001T08A008, November 5–7, 1996
Publisher: American Society of Mechanical Engineers
Paper No: 96-TA-041
https://doi.org/10.1115/96-TA-041
View Paper titled, Numerical Study of the Tip Clearance Flow Development in a Propulsion Pump Stage
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Topics: Clearances (Engineering), Flow (Dynamics), Propulsion, Pumps, Rotors, Vortices, Wake turbulence, Geometry, Navier-Stokes equations, Reynolds number
Proceedings Papers

Development of Hub Corner Stall and its Influence on the Performance of Axial Compressor Blade Rows

Chunill Hah, James Loellbach
Proc. ASME. GT1997, Volume 1: Aircraft Engine; Marine; Turbomachinery; Microturbines and Small Turbomachinery, V001T03A005, June 2–5, 1997
Publisher: American Society of Mechanical Engineers
Paper No: 97-GT-042
https://doi.org/10.1115/97-GT-042
View Paper titled, Development of Hub Corner Stall and its Influence on the Performance of Axial Compressor Blade Rows
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Topics: Blades, Compressors, Corners (Structural elements), Vortices, Rotors, Suction, Flow (Dynamics), Fluids, Boundary layers, Design
Proceedings Papers

Experimental and Computational Investigation of Stepped Tip Gap Effects on the Flowfield of a Transonic Axial-Flow Compressor Rotor

Donald W. Thompson, Paul I. King, Chunill Hah, Douglas C. Rabe
Proc. ASME. GT1998, Volume 1: Turbomachinery, V001T01A026, June 2–5, 1998
Publisher: American Society of Mechanical Engineers
Paper No: 98-GT-090
https://doi.org/10.1115/98-GT-090
View Paper titled, Experimental and Computational Investigation of Stepped Tip Gap Effects on the Flowfield of a Transonic Axial-Flow Compressor Rotor
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Topics: Axial flow, Compressors, Rotors, Clearances (Engineering), Flow (Dynamics), Geometry, Computational fluid dynamics, Design, Engineers, Inlet guide vanes