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Journal Articles

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

Accepted Manuscript
Dimtrios Vitlaris, David John Rajendran, Richard J. 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.
Paper No: GTP-23-1388
https://doi.org/10.1115/1.4063900
Published Online: October 30, 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: Flow (Dynamics), Physics, Thrust, Transients (Dynamics), Engines, Simulation, Airfoils, Rotation, Blades, Deformation
Journal Articles

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

Accepted Manuscript
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.
Paper No: GTP-23-1390
https://doi.org/10.1115/1.4063834
Published Online: October 19, 2023
View Article titled, Insights Into the Flow Field and Performance of a Boundary Layer Pump
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Topics: Boundary layers, Flow (Dynamics), Pumps, Rotors, Design, Disks, Reynolds-averaged Navier–Stokes equations, Topology, Water
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

Update of the sCO 2 -Test Rig at Cranfield University

Eduardo Anselmi, Pierre Belleoud, Ioannis Roumeliotis, Vassilios Pachidis
Proc. ASME. GT2022, Volume 9: Supercritical CO2, V009T28A024, June 13–17, 2022
Publisher: American Society of Mechanical Engineers
Paper No: GT2022-83273
https://doi.org/10.1115/GT2022-83273
View Paper titled, Update of the sCO 2 -Test Rig at Cranfield University
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Topics: Carbon dioxide, Cycles, Data acquisition systems, Fluids, Heat exchangers, Heat recovery, Supercritical carbon dioxide, Temperature measurement, Thermal management, Thermodynamic power cycles
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
Proceedings Papers

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
Proc. ASME. GT2022, Volume 1: Aircraft Engine; Ceramics and Ceramic Composites, V001T01A026, June 13–17, 2022
Publisher: American Society of Mechanical Engineers
Paper No: GT2022-82478
https://doi.org/10.1115/GT2022-82478
View Paper titled, Design Methodology and Mission Assessment of Parallel Hybrid Electric Propulsion Systems
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Topics: Design methodology, Electric propulsion, Fuels, Engines, Cycles, Aircraft, Gas turbines, Pressure, Algorithms, Architecture
Journal Articles

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

David John Rajendran, Richard Tunstall, Vassilios Pachidis
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. December 2022, 144(12): 121017.
Paper No: GTP-22-1306
https://doi.org/10.1115/1.4055489
Published Online: October 14, 2022
View Article titled, Estimation of Resultant Airframe Forces for a Variable Pitch Fan Operating in Reverse Thrust Mode
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Topics: Aircraft, Engines, Flow (Dynamics), Thrust, Drag (Fluid dynamics)
Journal Articles

Assessment of Engine Operability and Overall Performance for Parallel Hybrid Electric Propulsion Systems for a Single-Aisle Aircraft

Sangkeun Kang, Ioannis Roumeliotis, Jinning Zhang, Olivier Broca, Vassilios Pachidis
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. April 2022, 144(4): 041002.
Paper No: GTP-21-1550
https://doi.org/10.1115/1.4052880
Published Online: January 4, 2022
View Article titled, Assessment of Engine Operability and Overall Performance for Parallel Hybrid Electric Propulsion Systems for a Single-Aisle Aircraft
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Topics: Aircraft, Electric propulsion, Electricity (Physics), Engines, Gas turbines, Weight (Mass), Trains, Emissions, Transients (Dynamics), Steady state
Journal Articles

Design Exploration and Performance Assessment of Advanced Recuperated Hybrid-Electric Urban Air Mobility Rotorcraft

Chana Anna Saias, Ioannis Roumeliotis, 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 2022, 144(3): 031023.
Paper No: GTP-21-1262
https://doi.org/10.1115/1.4052955
Published Online: January 4, 2022
View Article titled, Design Exploration and Performance Assessment of Advanced Recuperated Hybrid-Electric Urban Air Mobility Rotorcraft
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Topics: Cycles, Design, Emissions, Engines, Fuels, Heat exchangers, Power stations, Rotors, Weight (Mass), Cities
Journal Articles

On the Use of an Inflatable Rubber Lip to Improve the Reverse Thrust Flow Field in a Variable Pitch Fan

David John Rajendran, Vassilios Pachidis
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. November 2021, 143(11): 111019.
Paper No: GTP-21-1290
https://doi.org/10.1115/1.4051961
Published Online: October 5, 2021
View Article titled, On the Use of an Inflatable Rubber Lip to Improve the Reverse Thrust Flow Field in a Variable Pitch Fan
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Topics: Design, Engines, Flow (Dynamics), Rubber, Thrust, Aircraft, Nozzles
Journal Articles

Preliminary Design of Hybrid-Electric Propulsion Systems for Emerging Urban Air Mobility Rotorcraft Architectures

Chana Anna Saias, Ioannis Goulos, Ioannis Roumeliotis, Vassilios Pachidis, Marko Bacic
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. November 2021, 143(11): 111015.
Paper No: GTP-21-1162
https://doi.org/10.1115/1.4052057
Published Online: October 4, 2021
View Article titled, Preliminary Design of Hybrid-Electric Propulsion Systems for Emerging Urban Air Mobility Rotorcraft Architectures
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Topics: Batteries, Design, Propulsion systems, Rotors, Weight (Mass), Gas turbines, Power stations, Fuels, Flight, Engines