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Journal Articles

On Leakage Flows In A Liquid Hydrogen Multi-Stage Pump for Aircraft Engine Applications

Accepted Manuscript
Dimitrios Lamprakis, David John Rajendran, Mani Santhanakrishnan, Seyfettin Coskun, Ioannis Roumeliotis, Vassilios Pachidis, Martin Yates
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power.
Paper No: GTP-24-1544
https://doi.org/10.1115/1.4066827
Published Online: October 11, 2024
View Article titled, On Leakage Flows In A Liquid Hydrogen Multi-Stage Pump for Aircraft Engine Applications
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Topics: Aircraft engines, Hydrogen, Leakage flows, Pumps, Flow (Dynamics), Design, Aircraft, Impellers, Cavities, Cooling
Proceedings Papers

Cavity Impact on the Base Flow Unsteadiness for a High-Speed Exhaust System

Spyros Tsentis, Ioannis Goulos, Simon Prince, Vassilios Pachidis, Vladeta Zmijanovic
Proc. ASME. GT2024, Volume 1: Aircraft Engine, V001T01A040, June 24–28, 2024
Publisher: American Society of Mechanical Engineers
Paper No: GT2024-126486
https://doi.org/10.1115/GT2024-126486
View Paper titled, Cavity Impact on the Base Flow Unsteadiness for a High-Speed Exhaust System
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Topics: Cavities, Exhaust systems, Flow (Dynamics), Flow control, Stress
Proceedings Papers

On Hysteresis in a Variable Pitch Fan Transitioning to Reverse Thrust Mode and Back

Dimitrios Vitlaris, David John Rajendran, Richard Tunstall, John Whurr, Vassilios Pachidis
Proc. ASME. GT2024, Volume 1: Aircraft Engine, V001T01A052, June 24–28, 2024
Publisher: American Society of Mechanical Engineers
Paper No: GT2024-128701
https://doi.org/10.1115/GT2024-128701
View Paper titled, On Hysteresis in a Variable Pitch Fan Transitioning to Reverse Thrust Mode and Back
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Topics: Flow (Dynamics), Thrust, Engines, Aircraft, Blades, Airfoils, Aviation, Climate neutrality, Delays, Displacement
Proceedings Papers

Integrated Performance Assessment and Decarbonising Potential for Aircraft Retrofitted With Sustainable Aviation Fuels

Pavlos Rompokos, Sarath Sasi, Christos Mourouzidis, Ioannis Roumeliotis, Vassilios Pachidis, Michelle Akure, Hannah Swindell
Proc. ASME. GT2024, Volume 2: Ceramics and Ceramic Composites; Coal, Biomass, Hydrogen, and Alternative Fuels, V002T03A033, June 24–28, 2024
Publisher: American Society of Mechanical Engineers
Paper No: GT2024-128858
https://doi.org/10.1115/GT2024-128858
View Paper titled, Integrated Performance Assessment and Decarbonising Potential for Aircraft Retrofitted With Sustainable Aviation Fuels
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Topics: Aircraft, Economics , Retrofitting, Sustainable aviation fuels
Proceedings Papers

On Leakage Flows in a Liquid Hydrogen Multi-Stage Pump for Aircraft Engine Applications

Dimitrios Lamprakis, David John Rajendran, Mani Santhanakrishnan, Seyfettin Coskun, Ioannis Roumeliotis, Vassilios Pachidis, Martin Yates
Proc. ASME. GT2024, Volume 5: Cycle Innovations, V005T06A034, June 24–28, 2024
Publisher: American Society of Mechanical Engineers
Paper No: GT2024-128734
https://doi.org/10.1115/GT2024-128734
View Paper titled, On Leakage Flows in a Liquid Hydrogen Multi-Stage Pump for Aircraft Engine Applications
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Topics: Aircraft, Aircraft engines, Hydrogen, Leakage flows, Pumps
Proceedings Papers

Acoustic Excitation As a Flow Control Technique in a High-Speed Compressor Cascade

Seyfettin Coskun, David John Rajendran, Vassilios Pachidis, Marko Bacic
Proc. ASME. GT2024, Volume 12C: Turbomachinery — Design Methods and CFD Modeling for Turbomachinery; Ducts, Noise, and Component Interactions, V12CT32A045, June 24–28, 2024
Publisher: American Society of Mechanical Engineers
Paper No: GT2024-128637
https://doi.org/10.1115/GT2024-128637
View Paper titled, Acoustic Excitation As a Flow Control Technique in a High-Speed Compressor Cascade
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Topics: Acoustics, Cascades (Fluid dynamics), Compressors, Excitation, Flow control
Journal Articles

Integrated Hybrid Engine Cycle Design and Power Management Optimization

Raj Ghelani, Ioannis Roumeliotis, Chana Anna Saias, Christos Mourouzidis, Vassilios Pachidis, Justin Norman, Marko Bacic
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. October 2024, 146(10): 101007.
Paper No: GTP-24-1037
https://doi.org/10.1115/1.4065020
Published Online: April 22, 2024
View Article titled, Integrated Hybrid Engine Cycle Design and Power Management Optimization
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Topics: Aircraft, Cycles, Design, Fuels, Gas turbines, Optimization, Retrofitting, Batteries
Journal Articles

Insights Into the Flow Field and Performance of a Boundary Layer Pump

David John Rajendran, Kyril Palaveev, Eduardo Anselmi, Mani Santhanakrishnan, Vassilios Pachidis
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. June 2024, 146(6): 061002.
Paper No: GTP-23-1390
https://doi.org/10.1115/1.4063834
Published Online: December 26, 2023
View Article titled, Insights Into the Flow Field and Performance of a Boundary Layer Pump
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Topics: Boundary layers, Disks, Entropy, Flow (Dynamics), Pressure, Pumps, Rotors, Design
Journal Articles

On the Flow Physics During the Transition of a Variable Pitch Fan From Nominal Operation to Reverse Thrust Mode

Dimitrios Vitlaris, David John Rajendran, Richard Tunstall, John Whurr, Vassilios Pachidis
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. April 2024, 146(4): 041001.
Paper No: GTP-23-1388
https://doi.org/10.1115/1.4063900
Published Online: December 1, 2023
View Article titled, On the Flow Physics During the Transition of a Variable Pitch Fan From Nominal Operation to Reverse Thrust Mode
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Topics: Airfoils, Engines, Flow (Dynamics), Thrust, Aircraft, Blades, Rotation
Journal Articles

Propulsion Aerodynamics for a Novel High-Speed Exhaust System

Spyros Tsentis, Ioannis Goulos, Simon Prince, Vassilios Pachidis, Vladeta Zmijanovic
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. December 2023, 145(12): 121011.
Paper No: GTP-23-1339
https://doi.org/10.1115/1.4063416
Published Online: October 17, 2023
View Article titled, Propulsion Aerodynamics for a Novel High-Speed Exhaust System
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Topics: Cavities, Design, Drag (Fluid dynamics), Exhaust systems, Flow (Dynamics), Nozzles, Pressure, Aerodynamics, Flow separation, Separation (Technology)
Proceedings Papers

Propulsion Aerodynamics for a Novel High-Speed Exhaust System

Spyros Tsentis, Ioannis Goulos, Simon Prince, Vassilios Pachidis, Vladeta Zmijanovic
Proc. ASME. GT2023, Volume 1: Aircraft Engine, V001T01A010, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-101005
https://doi.org/10.1115/GT2023-101005
View Paper titled, Propulsion Aerodynamics for a Novel High-Speed Exhaust System
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Topics: Aerodynamics, Cavities, Drag (Fluid dynamics), Exhaust systems, Nozzles, Propulsion
Proceedings Papers

Performance Analysis of an Engine-Mounted Compression System for Aircraft Environmental Control

Albert S. J. van Heerden, Salvatore Ippedico, David John Rajendran, Eduardo Anselmi-Palma, Ioannis Roumeliotis, Vassilios Pachidis, Richard Sharpe, Nicholas Howarth
Proc. ASME. GT2023, Volume 1: Aircraft Engine, V001T01A004, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-100761
https://doi.org/10.1115/GT2023-100761
View Paper titled, Performance Analysis of an Engine-Mounted Compression System for Aircraft Environmental Control
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Topics: Aircraft, Compression, Engines
Proceedings Papers

On the Flow Physics During the Transition of a Variable Pitch Fan From Nominal Operation to Reverse Thrust Mode

Dimitrios Vitlaris, David John Rajendran, Vassilios Pachidis, Richard Tunstall, John Whurr
Proc. ASME. GT2023, Volume 1: Aircraft Engine, V001T01A016, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-101980
https://doi.org/10.1115/GT2023-101980
View Paper titled, On the Flow Physics During the Transition of a Variable Pitch Fan From Nominal Operation to Reverse Thrust Mode
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Topics: Flow (Dynamics), Physics, Thrust
Proceedings Papers

Integrated Hybrid Engine Cycle Design and Power Management Optimization

Raj Ghelani, Ioannis Roumeliotis, Chana Anna Saias, Christos Mourouzidis, Vassilios Pachidis, Marko Bacic, Justin Norman
Proc. ASME. GT2023, Volume 1: Aircraft Engine, V001T01A027, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-103131
https://doi.org/10.1115/GT2023-103131
View Paper titled, Integrated Hybrid Engine Cycle Design and Power Management Optimization
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Topics: Cycles, Design, Hybrid engines, Optimization, Fuels, Aircraft, Gas turbines, Retrofitting, Architecture, Density
Proceedings Papers

Impacts of Alternative Aviation Fuels on Engine Cycle Design and Aircraft Mission Capability

Sarath Sasi, Christos Mourouzidis, Ioannis Roumeliotis, Theoklis Nikolaidis, Vassilios Pachidis, Justin Norman
Proc. ASME. GT2023, Volume 2: Ceramics and Ceramic Composites; Coal, Biomass, Hydrogen, and Alternative Fuels, V002T03A005, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-101114
https://doi.org/10.1115/GT2023-101114
View Paper titled, Impacts of Alternative Aviation Fuels on Engine Cycle Design and Aircraft Mission Capability
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Topics: Aircraft, Aviation, Carbon, Cycles, Design, Engines, Fuels
Proceedings Papers

Insights Into the Flow Field and Performance of a Boundary Layer Pump

Kyril Palaveev, David John Rajendran, Eduardo Anselmi, Mani Santhanakrishnan, Vassilios Pachidis
Proc. ASME. GT2023, Volume 9: Microturbines, Turbochargers, and Small Turbomachines; Oil and Gas Applications, V009T18A006, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-102186
https://doi.org/10.1115/GT2023-102186
View Paper titled, Insights Into the Flow Field and Performance of a Boundary Layer Pump
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Topics: Boundary layers, Flow (Dynamics), Pumps
Proceedings Papers

A Characteristic-Based 1D Axial Compressor Model for Stall and Surge Simulations

Sajal Kissoon, Mauro Righi, Lucas Pawsey, Vassilios Pachidis, Richard Tunstall, Ioannis Roumeliotis
Proc. ASME. GT2023, Volume 13A: Turbomachinery — Axial Flow Fan and Compressor Aerodynamics, V13AT29A002, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-100709
https://doi.org/10.1115/GT2023-100709
View Paper titled, A Characteristic-Based 1D Axial Compressor Model for Stall and Surge Simulations
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Topics: Compressors, Simulation, Surges, Transients (Dynamics)
Journal Articles

On the Effects of Optimal Implementation of Variable Rotor Speed and Power Management on Hybrid-Electric Rotorcraft

Chana Anna Saias, Ioannis Goulos, Vassilios Pachidis, Marko Bacic
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. March 2023, 145(3): 031028.
Paper No: GTP-22-1245
https://doi.org/10.1115/1.4056855
Published Online: February 23, 2023
View Article titled, On the Effects of Optimal Implementation of Variable Rotor Speed and Power Management on Hybrid-Electric Rotorcraft
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Topics: Fuels, Rotors, Engines, Design, Batteries, Weight (Mass), Flight, Optimization
Journal Articles

Design Methodology and Mission Assessment of Parallel Hybrid Electric Propulsion Systems

Raj Ghelani, Ioannis Roumeliotis, Chana Anna Saias, Christos Mourouzidis, Vassilios Pachidis, Justin Norman, Marko Bacic
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. March 2023, 145(3): 031002.
Paper No: GTP-22-1416
https://doi.org/10.1115/1.4055635
Published Online: December 5, 2022
View Article titled, Design Methodology and Mission Assessment of Parallel Hybrid Electric Propulsion Systems
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Topics: Aircraft, Batteries, Cycles, Design, Engines, Retrofitting, Fuels
Proceedings Papers

Estimation of Resultant Airframe Forces for a Variable Pitch Fan Operating in Reverse Thrust Mode

David John Rajendran, Richard Tunstall, Vassilios Pachidis
Proc. ASME. GT2022, Volume 1: Aircraft Engine; Ceramics and Ceramic Composites, V001T01A024, June 13–17, 2022
Publisher: American Society of Mechanical Engineers
Paper No: GT2022-82446
https://doi.org/10.1115/GT2022-82446
View Paper titled, Estimation of Resultant Airframe Forces for a Variable Pitch Fan Operating in Reverse Thrust Mode
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Topics: Flow (Dynamics), Thrust