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Journal Articles

Preliminary Wear Investigations With Pressure Actuated Leaf Seals for Superheated Steam Turbine Application

Andreas Wittenberg, Tobias Rühle, Johannes Greving, Florian Wichern, Jens Friedrichs
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. March 2024, 146(3): 031019.
Paper No: GTP-23-1440
https://doi.org/10.1115/1.4063587
Published Online: November 28, 2023
View Article titled, Preliminary Wear Investigations With Pressure Actuated Leaf Seals for Superheated Steam Turbine Application
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Topics: Pressure, Wear, Clearances (Engineering)
Journal Articles

A Study on Quantities Driving Maintenance, Repair, and Overhaul for Hybrid-Electric Aeroengines

Lukas Schuchard, Maximilian Bień, Karl Ziaja, Norman Blanken, Jan Göing, Jens Friedrichs, Francesca di Mare, Bernd Ponick, Ronald Mailach
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. February 2024, 146(2): 021013.
Paper No: GTP-23-1340
https://doi.org/10.1115/1.4063580
Published Online: November 2, 2023
View Article titled, A Study on Quantities Driving Maintenance, Repair, and Overhaul for Hybrid-Electric Aeroengines
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Topics: Aircraft, Engines, Flight, Gas turbines, Maintenance, Temperature, Thrust, Machinery, Aircraft propulsion, Turbines
Proceedings Papers

Preliminary Wear Investigations With Pressure Actuated Leaf Seals for Superheated Steam Turbine Application

Andreas Wittenberg, Tobias Rühle, Johannes Greving, Florian Wichern, Jens Friedrichs
Proc. ASME. GT2023, Volume 10: Steam Turbine, V010T20A022, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-103823
https://doi.org/10.1115/GT2023-103823
View Paper titled, Preliminary Wear Investigations With Pressure Actuated Leaf Seals for Superheated Steam Turbine Application
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Topics: Compressed air, Pressure, Steam turbines, Superheating, Wear
Proceedings Papers

CFD Parameter Studies Using an Actuator Disk to Quantify the Interactions on an Airfoil Segment for Distributed Propulsion

Bastian Kirsch, Jens Friedrichs
Proc. ASME. GT2023, Volume 1: Aircraft Engine, V001T01A011, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-101248
https://doi.org/10.1115/GT2023-101248
View Paper titled, CFD Parameter Studies Using an Actuator Disk to Quantify the Interactions on an Airfoil Segment for Distributed Propulsion
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Topics: Actuators, Airfoils, Computational fluid dynamics, Disks, Propulsion
Proceedings Papers

A Study on Quantities Driving Maintenance, Repair, and Overhaul for Hybrid-Electric Aeroengines

Lukas Schuchard, Maximilian Bień, Karl Ziaja, Norman Blanken, Jan Göing, Jens Friedrichs, Francesca di Mare, Bernd Ponick, Ronald Mailach
Proc. ASME. GT2023, Volume 1: Aircraft Engine, V001T01A009, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-100915
https://doi.org/10.1115/GT2023-100915
View Paper titled, A Study on Quantities Driving Maintenance, Repair, and Overhaul for Hybrid-Electric Aeroengines
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Topics: Aircraft propulsion, Maintenance
Proceedings Papers

Analysis of the Condensation Phenomena Within the Radial Turbine of a Fuel Cell Turbocharger

Tim Wittmann, Sebastian Lück, Jens Friedrichs, Piotr Wiśniewski, Sławomir Dykas
Proc. ASME. GT2022, Volume 10B: Turbomachinery — Axial Flow Turbine Aerodynamics; Deposition, Erosion, Fouling, and Icing; Radial Turbomachinery Aerodynamics, V10BT35A010, June 13–17, 2022
Publisher: American Society of Mechanical Engineers
Paper No: GT2022-82279
https://doi.org/10.1115/GT2022-82279
View Paper titled, Analysis of the Condensation Phenomena Within the Radial Turbine of a Fuel Cell Turbocharger
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Topics: Condensation, Fuel cells, Turbines, Turbochargers, Compressors, Exhaust systems, Rotors, Aerodynamics, Annulus, Compressed air
Proceedings Papers

Impact of Compressor and Turbine Operating Range Extension on the Performance of an Electric Turbocharger for Fuel Cell Applications

Sebastian Lück, Markus Schödel, Marco Menze, Jan Göing, Jörg R. Seume, Jens Friedrichs
Proc. ASME. GT2022, Volume 7: Industrial and Cogeneration; Manufacturing Materials and Metallurgy; Microturbines, Turbochargers, and Small Turbomachines; Oil & Gas Applications, V007T18A020, June 13–17, 2022
Publisher: American Society of Mechanical Engineers
Paper No: GT2022-82974
https://doi.org/10.1115/GT2022-82974
View Paper titled, Impact of Compressor and Turbine Operating Range Extension on the Performance of an Electric Turbocharger for Fuel Cell Applications
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Topics: Compressors, Fuel cell applications, Turbines, Turbochargers, Transients (Dynamics), Diffusers, Nozzles, Surges, Geometry, Machinery
Proceedings Papers

Aerodynamic Damping of Composite UHBR Fans Under the Consideration of Acoustic Intake Reflections

Jan Gößling, Joerg R. Seume, Jan Peter Flüh, Nicola Paletta, Torben Eggers, Jens Friedrichs, Nunzio Natale
Proc. ASME. GT2022, Volume 8A: Structures and Dynamics — Aerodynamics Excitation and Damping; Bearing and Seal Dynamics; Emerging Methods in Engineering Design, Analysis, and Additive Manufacturing; Fatigue, Fracture, and Life Prediction, V08AT21A008, June 13–17, 2022
Publisher: American Society of Mechanical Engineers
Paper No: GT2022-81777
https://doi.org/10.1115/GT2022-81777
View Paper titled, Aerodynamic Damping of Composite UHBR Fans Under the Consideration of Acoustic Intake Reflections
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Topics: Acoustics, Composite materials, Damping, Fans, Reflection, Blades, Engines, Fibers, Rotors, Stiffness
Proceedings Papers

Sensitivity Analysis of an Aircraft Engine Model Under Consideration of Dependent Variables

Julian Salomon, Jan Göing, Sebastian Lück, Matteo Broggi, Jens Friedrichs, Michael Beer
Proc. ASME. GT2021, Volume 1: Aircraft Engine; Fans and Blowers; Marine; Wind Energy; Scholar Lecture, V001T01A005, June 7–11, 2021
Publisher: American Society of Mechanical Engineers
Paper No: GT2021-58905
https://doi.org/10.1115/GT2021-58905
View Paper titled, Sensitivity Analysis of an Aircraft Engine Model Under Consideration of Dependent Variables
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Topics: Aircraft engines, Sensitivity analysis, Engines, Turbofans
Proceedings Papers

Composite UHBR Fan for Forced Response and Flutter Investigations

Torben Eggers, Jens Friedrichs, Jan Goessling, Joerg R. Seume, Nunzio Natale, Jan Peter Flüh, Nicola Paletta
Proc. ASME. GT2021, Volume 2A: Turbomachinery — Axial Flow Fan and Compressor Aerodynamics, V02AT31A021, June 7–11, 2021
Publisher: American Society of Mechanical Engineers
Paper No: GT2021-58941
https://doi.org/10.1115/GT2021-58941
View Paper titled, Composite UHBR Fan for Forced Response and Flutter Investigations
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Topics: Composite materials, Flutter (Aerodynamics), Blades, Design, Computer simulation, Rotors, Wind tunnels
Proceedings Papers

Influence of Roughness on the Transition Modeling in Compressor Flows

Vera Tolksdorf, Anubhav Gokhale, Daniel Kessler, Leroy Benjamin, Christoph Bode, Jens Friedrichs
Proc. ASME. GT2021, Volume 2C: Turbomachinery — Design Methods and CFD Modeling for Turbomachinery; Ducts, Noise, and Component Interactions, V02CT34A039, June 7–11, 2021
Publisher: American Society of Mechanical Engineers
Paper No: GT2021-60003
https://doi.org/10.1115/GT2021-60003
View Paper titled, Influence of Roughness on the Transition Modeling in Compressor Flows
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Topics: Compressors, Flow (Dynamics), Modeling, Surface roughness, Engines, Turbulence, Boundary layers, Reynolds-averaged Navier–Stokes equations, Rotors, Airfoils
Proceedings Papers

Quantifying Model Uncertainties and Sensitivities in Parallel Compressor Models

Jonas Voigt, Keith-Noah Jurke, Julius Schultz, Ulrich Römer, Jens Friedrichs
Proc. ASME. GT2021, Volume 2D: Turbomachinery — Multidisciplinary Design Approaches, Optimization, and Uncertainty Quantification; Radial Turbomachinery Aerodynamics; Unsteady Flows in Turbomachinery, V02DT36A010, June 7–11, 2021
Publisher: American Society of Mechanical Engineers
Paper No: GT2021-59373
https://doi.org/10.1115/GT2021-59373
View Paper titled, Quantifying Model Uncertainties and Sensitivities in Parallel Compressor Models
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Topics: Compressors, Uncertainty, Modeling, Errors, Inflow, Computational fluid dynamics, Engineering simulation, Sampling methods, Sensitivity analysis, Simulation
Proceedings Papers

The Influence of Condensation on the Performance Map of a Fuel Cell Turbocharger Turbine

Tim Wittmann, Sebastian Lück, Tim Hertwig, Christoph Bode, Jens Friedrichs
Proc. ASME. GT2021, Volume 6: Ceramics and Ceramic Composites; Coal, Biomass, Hydrogen, and Alternative Fuels; Microturbines, Turbochargers, and Small Turbomachines, V006T19A001, June 7–11, 2021
Publisher: American Society of Mechanical Engineers
Paper No: GT2021-58472
https://doi.org/10.1115/GT2021-58472
View Paper titled, The Influence of Condensation on the Performance Map of a Fuel Cell Turbocharger Turbine
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Topics: Condensation, Fuel cells, Turbines, Turbochargers, Pressure, Drops, Inflow, Nucleation (Physics), Aerodynamics, Exhaust systems
Journal Articles

The Feasibility of an Euler–Lagrange Approach for the Modeling of Wet Steam

Tim Wittmann, Christoph Bode, Jens Friedrichs
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. April 2021, 143(4): 041004.
Paper No: GTP-20-1713
https://doi.org/10.1115/1.4049859
Published Online: February 22, 2021
View Article titled, The Feasibility of an Euler–Lagrange Approach for the Modeling of Wet Steam
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Topics: Condensation, Drops, Flow (Dynamics), Modeling, Nozzles, Nucleation (Physics), Steam, Vapors
Proceedings Papers

The Feasibility of an Euler-Lagrange Approach for the Modelling of Wet Steam

Tim Wittmann, Christoph Bode, Jens Friedrichs
Proc. ASME. GT2020, Volume 2C: Turbomachinery, V02CT35A053, September 21–25, 2020
Publisher: American Society of Mechanical Engineers
Paper No: GT2020-16199
https://doi.org/10.1115/GT2020-16199
View Paper titled, The Feasibility of an Euler-Lagrange Approach for the Modelling of Wet Steam
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Topics: Modeling, Steam, Nucleation (Physics), Condensation, Flow (Dynamics), Nozzles, Drops, Turbines
Proceedings Papers

Performance Simulation of Roughness Induced Module Variations of a Jet Propulsion by Using Pseudo Bond Graph Theory

Jan Göing, Christoph Bode, Jens Friedrichs, Hendrik Seehausen, Florian Herbst, Joerg R. Seume
Proc. ASME. GT2020, Volume 1: Aircraft Engine; Fans and Blowers, V001T01A014, September 21–25, 2020
Publisher: American Society of Mechanical Engineers
Paper No: GT2020-14456
https://doi.org/10.1115/GT2020-14456
View Paper titled, Performance Simulation of Roughness Induced Module Variations of a Jet Propulsion by Using Pseudo Bond Graph Theory
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Topics: Jet propulsion, Simulation, Surface roughness, Transients (Dynamics), Computational fluid dynamics, Engines, Jet engines, Blades, Compressors, Differential equations
Proceedings Papers

Pseudo Bond Graph System Modelling of Electric Air Compressors With Energy Recovery for Fuel Cell Applications

Sebastian Lück, Jan Göing, Christoph Bode, Jens Friedrichs
Proc. ASME. GT2020, Volume 8: Industrial and Cogeneration; Manufacturing Materials and Metallurgy; Marine; Microturbines, Turbochargers, and Small Turbomachines, V008T20A015, September 21–25, 2020
Publisher: American Society of Mechanical Engineers
Paper No: GT2020-15029
https://doi.org/10.1115/GT2020-15029
View Paper titled, Pseudo Bond Graph System Modelling of Electric Air Compressors With Energy Recovery for Fuel Cell Applications
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Topics: Air compressors, Energy recovery, Fuel cell applications, Modeling, Simulation, Transients (Dynamics), Compressibility, Fluids, Inertia (Mechanics), Machinery
Proceedings Papers

Aerodynamic Design and Assessment of a Compact, Single Stage Axial Fan for Low Noise Emission

Daniel Kessler, Daniel Giesecke, Jens Friedrichs, Jörg Leuschner
Proc. ASME. AJKFluids2019, Volume 3B: Fluid Applications and Systems, V03BT03A071, July 28–August 1, 2019
Publisher: American Society of Mechanical Engineers
Paper No: AJKFluids2019-5070
https://doi.org/10.1115/AJKFluids2019-5070
View Paper titled, Aerodynamic Design and Assessment of a Compact, Single Stage Axial Fan for Low Noise Emission
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Topics: Design, Emissions, Noise (Sound), Acoustics, Construction, Cooling systems, Locomotives, Pressure, Approximation, Blades
Proceedings Papers

Operational Performance and Locally Resolved Outflow of Brush Seals

Fabian Schur, Jens Friedrichs
Proc. ASME. AJKFluids2019, Volume 3B: Fluid Applications and Systems, V03BT03A063, July 28–August 1, 2019
Publisher: American Society of Mechanical Engineers
Paper No: AJKFluids2019-4877
https://doi.org/10.1115/AJKFluids2019-4877
View Paper titled, Operational Performance and Locally Resolved Outflow of Brush Seals
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Topics: Design, Flow (Dynamics), Jet engines, Leakage, Outflow, Pressure, Rotors, Sealing (Process), Steam turbines, Wear
Proceedings Papers

Jet Propulsion Engine Modelling Using Pseudo Bond Graph Approach

Jan Göing, Andreas Kellersmann, Christoph Bode, Jens Friedrichs
Proc. ASME. GT2019, Volume 1: Aircraft Engine; Fans and Blowers; Marine; Honors and Awards, V001T01A007, June 17–21, 2019
Publisher: American Society of Mechanical Engineers
Paper No: GT2019-90420
https://doi.org/10.1115/GT2019-90420
View Paper titled, Jet Propulsion Engine Modelling Using Pseudo Bond Graph Approach
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Topics: Engines, Jet propulsion, Modeling, Transients (Dynamics), Computer software, Jet engines, Stress, Construction, Simulation, Steady state