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R. F. Martinez-Botas
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Journal Articles

A Detailed Comparison on the Influence of Flow Unsteadiness Between the Vaned and Vaneless Mixed-Flow Turbocharger Turbine

M. H. Padzillah, S. Rajoo, R. F. Martinez-Botas
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. April 2018, 140(4): 042601.
Paper No: GTP-17-1066
https://doi.org/10.1115/1.4038076
Published Online: October 31, 2017
View Article titled, A Detailed Comparison on the Influence of Flow Unsteadiness Between the Vaned and Vaneless Mixed-Flow Turbocharger Turbine
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Topics: Flow (Dynamics), Pressure, Turbines, Vaneless turbines, Rotors, Turbochargers, Computational fluid dynamics
Proceedings Papers

A Numerical Investigation on a New Pulse-Optimized Flow Control Method for Turbocharger Turbine Performance Improvement Under Pulsating Conditions

K. Cao, M. Yang, R. F. Martinez-Botas
Proc. ASME. GT2015, Volume 2C: Turbomachinery, V02CT42A003, June 15–19, 2015
Publisher: American Society of Mechanical Engineers
Paper No: GT2015-42059
https://doi.org/10.1115/GT2015-42059
View Paper titled, A Numerical Investigation on a New Pulse-Optimized Flow Control Method for Turbocharger Turbine Performance Improvement Under Pulsating Conditions
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Topics: Flow control, Turbines, Turbochargers, Flow (Dynamics), Nozzles, Exhaust systems, Computer simulation, Internal combustion engines, Piston engines, Potential energy
Proceedings Papers

A Cold Heat Transfer Tunnel for Gas Turbine Research on an Annular Cascade

R. F. Martinez-Botas, A. J. Main, G. D. Lock, T. V. Jones
Proc. ASME. GT1993, Volume 3B: General, V03BT16A004, May 24–27, 1993
Publisher: American Society of Mechanical Engineers
Paper No: 93-GT-248
https://doi.org/10.1115/93-GT-248
View Paper titled, A Cold Heat Transfer Tunnel for Gas Turbine Research on an Annular Cascade
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Topics: Cascades (Fluid dynamics), Gas turbines, Heat transfer, Tunnels, Blades, Design, Flow (Dynamics), Mach number, Nozzle guide vanes, Pressure
Proceedings Papers

Heat Transfer Measurements in an Annular Cascade of Transonic Gas Turbine Blades Using the Transient Liquid Crystal Technique

R. F. Martinez-Botas, G. D. Lock, T. V. Jones
Proc. ASME. GT1994, Volume 4: Heat Transfer; Electric Power; Industrial and Cogeneration, V004T09A024, June 13–16, 1994
Publisher: American Society of Mechanical Engineers
Paper No: 94-GT-172
https://doi.org/10.1115/94-GT-172
View Paper titled, Heat Transfer Measurements in an Annular Cascade of Transonic Gas Turbine Blades Using the Transient Liquid Crystal Technique
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Topics: Blades, Cascades (Fluid dynamics), Gas turbines, Heat transfer, Liquid crystals, Transients (Dynamics), Heat transfer coefficients, Reynolds number, Airfoils, Annulus
Proceedings Papers

Performance of a Mixed Flow Turbocharger Turbine Under Pulsating Flow Conditions

C. Arcoumanis, I. Hakeem, L. Khezzar, R. F. Martinez-Botas, N. C. Baines
Proc. ASME. GT1995, Volume 2: Aircraft Engine; Marine; Microturbines and Small Turbomachinery, V002T04A011, June 5–8, 1995
Publisher: American Society of Mechanical Engineers
Paper No: 95-GT-210
https://doi.org/10.1115/95-GT-210
View Paper titled, Performance of a Mixed Flow Turbocharger Turbine Under Pulsating Flow Conditions
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Topics: Flow (Dynamics), Pulsatile flow, Turbines, Turbochargers, Engines, Blades, Exhaust systems, Geometry, Design, Gases
Proceedings Papers

Numerical Calculations of a Turbine Volute Using a 3-D Navier-Stokes Solver

R. F. Martinez-Botas, K. R. Pullen, F. Shi
Proc. ASME. GT1996, Volume 1: Turbomachinery, V001T01A022, June 10–13, 1996
Publisher: American Society of Mechanical Engineers
Paper No: 96-GT-066
https://doi.org/10.1115/96-GT-066
View Paper titled, Numerical Calculations of a Turbine Volute Using a 3-D Navier-Stokes Solver
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Topics: Turbines, Flow (Dynamics), Momentum, Pressure, Algorithms, Computation, Computational fluid dynamics, Geometry, Interpolation, Reynolds number
Proceedings Papers

Inlet and Exit Flow Characteristics of Mixed Flow Turbines

C. Arcoumanis, R. F. Martinez-Botas, J. M. Nouri, C. C. Su
Proc. ASME. GT1998, Volume 1: Turbomachinery, V001T01A119, June 2–5, 1998
Publisher: American Society of Mechanical Engineers
Paper No: 98-GT-495
https://doi.org/10.1115/98-GT-495
View Paper titled, Inlet and Exit Flow Characteristics of Mixed Flow Turbines
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Topics: Flow (Dynamics), Turbines, Design, Rotors, Blades, High pressure (Physics), Kinetic energy, Laser Doppler anemometry, Steady state, Stress
Proceedings Papers

Detailed Flow Measurements at the Exit of a Mixed Flow Turbine Under Steady Flow Conditions

N. Karamanis, R. F. Martinez-Botas, C. C. Su
Proc. ASME. GT1999, Volume 1: Aircraft Engine; Marine; Turbomachinery; Microturbines and Small Turbomachinery, V001T03A054, June 7–10, 1999
Publisher: American Society of Mechanical Engineers
Paper No: 99-GT-342
https://doi.org/10.1115/99-GT-342
View Paper titled, Detailed Flow Measurements at the Exit of a Mixed Flow Turbine Under Steady Flow Conditions
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Topics: Flow (Dynamics), Flow measurement, Turbines, Blades, Rotors, Design, Laser Doppler anemometry, Testing performance, Turbochargers
Proceedings Papers

Numerical and Experimental Investigation of Pulsating Flow Effect on a Nozzled and Nozzleless Mixed Flow Turbine for an Automotive Turbocharger

M. H. Padzillah, M. Yang, W. Zhuge, R. F. Martinez-Botas
Proc. ASME. GT2014, Volume 2D: Turbomachinery, V02DT42A027, June 16–20, 2014
Publisher: American Society of Mechanical Engineers
Paper No: GT2014-26152
https://doi.org/10.1115/GT2014-26152
View Paper titled, Numerical and Experimental Investigation of Pulsating Flow Effect on a Nozzled and Nozzleless Mixed Flow Turbine for an Automotive Turbocharger
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Topics: Flow (Dynamics), Pulsatile flow, Turbines, Turbochargers, Simulation, Computational fluid dynamics, Pressure, Design, Nozzles, Simulation results
Proceedings Papers

Mixed Flow Turbines: Inlet and Exit Flow Under Steady and Pulsating Conditions

N. Karamanis, R. F. Martinez-Botas, C. C. Su
Proc. ASME. GT2000, Volume 1: Aircraft Engine; Marine; Turbomachinery; Microturbines and Small Turbomachinery, V001T03A041, May 8–11, 2000
Publisher: American Society of Mechanical Engineers
Paper No: 2000-GT-0470
https://doi.org/10.1115/2000-GT-0470
View Paper titled, Mixed Flow Turbines: Inlet and Exit Flow Under Steady and Pulsating Conditions
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Topics: Flow (Dynamics), Turbines, Blades, Rotors, Turbochargers, Pipes, Design, Diesel, Engines, Flow measurement
Proceedings Papers

Measurement of Local Heat Transfer Coefficient and Film Cooling Effectiveness Through Discrete Holes

R. F. Martinez-Botas, C. H. N. Yuen
Proc. ASME. GT2000, Volume 3: Heat Transfer; Electric Power; Industrial and Cogeneration, V003T01A050, May 8–11, 2000
Publisher: American Society of Mechanical Engineers
Paper No: 2000-GT-0243
https://doi.org/10.1115/2000-GT-0243
View Paper titled, Measurement of Local Heat Transfer Coefficient and Film Cooling Effectiveness Through Discrete Holes
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Topics: Film cooling, Heat transfer coefficients, Density, Liquid crystals, Temperature, Adiabatic cooling, Boundary layers, Cooling, Flat plates, Heat transfer
Proceedings Papers

Film Cooling Effectiveness Downstream of Compound and Fan-Shaped Holes

C. H. N. Yuen, R. F. Martinez-Botas, J. H. Whitelaw
Proc. ASME. GT2001, Volume 3: Heat Transfer; Electric Power; Industrial and Cogeneration, V003T01A017, June 4–7, 2001
Publisher: American Society of Mechanical Engineers
Paper No: 2001-GT-0131
https://doi.org/10.1115/2001-GT-0131
View Paper titled, Film Cooling Effectiveness Downstream of Compound and Fan-Shaped Holes
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Topics: Film cooling, Fluids, Momentum, Shapes, Carbon dioxide, Cooling, Density, Flat plates, Flow (Dynamics), Heat transfer coefficients
Proceedings Papers

Systematic One Zone Meanline Modelling of Centrifugal Compressors for Industrial Online Applications

Matteo Cicciotti, R. F. Martinez-Botas, Alessandro Romagnoli, Nina F. Thornhill, Stephanie Geist, Axel Schild
Proc. ASME. GT2013, Volume 6C: Turbomachinery, V06CT40A025, June 3–7, 2013
Publisher: American Society of Mechanical Engineers
Paper No: GT2013-95821
https://doi.org/10.1115/GT2013-95821
View Paper titled, Systematic One Zone Meanline Modelling of Centrifugal Compressors for Industrial Online Applications
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Topics: Compressors, Modeling, Artificial neural networks, Boundary-value problems, Condition monitoring, Maintenance, Optimization, Polynomials, Pressure, Regression models
Proceedings Papers

Numerical Assessment of Unsteady Flow Effects on a Nozzled Turbocharger Turbine

M. H. Padzillah, S. Rajoo, R. F. Martinez-Botas
Proc. ASME. GT2012, Volume 8: Turbomachinery, Parts A, B, and C, 745-756, June 11–15, 2012
Publisher: American Society of Mechanical Engineers
Paper No: GT2012-69062
https://doi.org/10.1115/GT2012-69062
View Paper titled, Numerical Assessment of Unsteady Flow Effects on a Nozzled Turbocharger Turbine
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Topics: Computational fluid dynamics, Pulsatile flow, Turbines, Turbochargers, Unsteady flow
Journal Articles

Unsteady Effect in a Nozzled Turbocharger Turbine

Srithar Rajoo, R. F. Martinez-Botas
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. July 2010, 132(3): 031001.
https://doi.org/10.1115/1.3142862
Published Online: March 24, 2010
View Article titled, Unsteady Effect in a Nozzled Turbocharger Turbine
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Topics: Flow (Dynamics), Nozzles, Pulsatile flow, Turbines, Turbochargers, Cycles
Proceedings Papers

Active Control Turbocharger (ACT): A Method to Improve Energy Extraction From an Engine Exhaust Gas

Yoann Me´rigot, Srithar Rajoo, R. F. Martinez-Botas
Proc. ASME. GT2009, Volume 5: Microturbines and Small Turbomachinery; Oil and Gas Applications, 137-151, June 8–12, 2009
Publisher: American Society of Mechanical Engineers
Paper No: GT2009-59550
https://doi.org/10.1115/GT2009-59550
View Paper titled, Active Control Turbocharger (ACT): A Method to Improve Energy Extraction From an Engine Exhaust Gas
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Topics: Engines, Exhaust systems, Turbochargers, Geometry, Turbines, Flow (Dynamics), Simulation, Stress
Proceedings Papers

Lean and Straight Nozzle Vanes in a Variable Geometry Turbine: A Steady and Pulsating Flow Investigation

Srithar Rajoo, R. F. Martinez-Botas
Proc. ASME. GT2008, Volume 6: Turbomachinery, Parts A, B, and C, 1589-1601, June 9–13, 2008
Publisher: American Society of Mechanical Engineers
Paper No: GT2008-50828
https://doi.org/10.1115/GT2008-50828
View Paper titled, Lean and Straight Nozzle Vanes in a Variable Geometry Turbine: A Steady and Pulsating Flow Investigation
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Topics: Geometry, Nozzles, Pulsatile flow, Turbines, Flow (Dynamics), Turbochargers, Cycles, Engines, Pressure, Design
Proceedings Papers

Unsteady Effect in a Nozzled Turbocharger Turbine

Srithar Rajoo, R. F. Martinez-Botas
Proc. ASME. GT2007, Volume 6: Turbo Expo 2007, Parts A and B, 1159-1170, May 14–17, 2007
Publisher: American Society of Mechanical Engineers
Paper No: GT2007-28323
https://doi.org/10.1115/GT2007-28323
View Paper titled, Unsteady Effect in a Nozzled Turbocharger Turbine
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Topics: Turbines, Turbochargers, Flow (Dynamics), Nozzles, Pulsatile flow, Cylinders, Damping, Engines, Internal combustion engines, Test facilities
Proceedings Papers

Numerical Study of the Internal Flow Field Characteristics in Mixed Flow Turbines

D. Palfreyman, R. F. Martinez-Botas
Proc. ASME. GT2002, Volume 5: Turbo Expo 2002, Parts A and B, 455-472, June 3–6, 2002
Publisher: American Society of Mechanical Engineers
Paper No: GT2002-30372
https://doi.org/10.1115/GT2002-30372
View Paper titled, Numerical Study of the Internal Flow Field Characteristics in Mixed Flow Turbines
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Topics: Flow (Dynamics), Internal flow, Turbines, Blades, Computational fluid dynamics, Density, Vortices, Boundary-value problems, Clearances (Engineering), Geometry
Proceedings Papers

The Pulsating Flow Field in a Mixed Flow Turbocharger Turbine: An Experimental and Computational Study

D. Palfreyman, R. F. Martinez-Botas
Proc. ASME. GT2004, Volume 5: Turbo Expo 2004, Parts A and B, 697-708, June 14–17, 2004
Publisher: American Society of Mechanical Engineers
Paper No: GT2004-53143
https://doi.org/10.1115/GT2004-53143
View Paper titled, The Pulsating Flow Field in a Mixed Flow Turbocharger Turbine: An Experimental and Computational Study
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Topics: Flow (Dynamics), Pulsatile flow, Turbines, Turbochargers, Computational methods, Exhaust systems, Modeling, Piston engines, Spectra (Spectroscopy), Valves