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Hauke Witte, Christoph Bode and Jens Friedrichs
Typically installed in a rotor-only configuration, low-pressure axial fans discharge directly into a free atmosphere and the discharge shows a strong swirl component. Since such designs, without guide vanes, cannot convert the dynamic pressure in the swi...
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Lennart Lobitz, Hendrik Traub, Mats Overbeck, Maximilian Bien, Sebastian Heimbs, Christian Hühne, Jens Friedrichs and Peter Horst
Laminar flow offers significant potential for increasing the energy-efficiency of future transport aircraft. The German Cluster of Excellence SE2A is developing a new approach for hybrid laminar flow control. The concept aims to maintain laminar flow up ...
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Patrick Meyer, Sebastian Lück, Tobias Spuhler, Christoph Bode, Christian Hühne, Jens Friedrichs and Michael Sinapius
High aspect ratio aircraft have a significantly reduced induced drag, but have only limited installation space for control surfaces near the wingtip. This paper describes a multidisciplinary design methodology for a morphing aileron that is based on pres...
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Tim Wittmann, Sebastian Lück, Christoph Bode and Jens Friedrichs
Radial turbines used in automotive fuel cell turbochargers operate with humid air. The gas expansion in the turbine causes droplets to form, which then grow through condensation. The associated release of latent heat and decrease in the gaseous mass flow...
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Torben Eggers, Hye Rim Kim, Simon Bittner, Jens Friedrichs and Joerg R. Seume
In modern aircraft engines, the low-pressure compressor (LPC) is subjected to a flow characterized by strong wakes and secondary flows from the upstream fan. This concerns ultra-high bypass ratio (UHBR) turbofan engines, in particular. This paper present...
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Christoph Bode, Jens Friedrichs, Dominik Frieling and Florian Herbst
For the numerical prediction of turbomachinery flows, a two-equation turbulence model in combination with a proper transition model to account for laminar boundary layers and their transition to turbulence is state of the art. This paper presents the abi...
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Gerald Reitz and Jens Friedrichs
Current civil aviation is characterized by rising cost and competitive pressure, which is partly passed to the MRO (Maintenance, Repair and Overhaul) companies. To improve the maintenance, condition-based maintenance is established, which is characterize...
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Andreas Kellersmann, Gerald Reitz and Jens Friedrichs
The decreasing performance of jet engines during operation is a major concern for airlines and maintenance companies. Among other effects, the erosion of high-pressure compressor (HPC) blades is a critical one and leads to a changed aerodynamic behavior,...
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Manuel Hildebrandt, Heiko Schwarz, Corina Schwitzke, Hans-Jörg Bauer and Jens Friedrichs
Reducing losses in the secondary air system of gas and steam turbines can significantly increase the efficiency of such machines. Meanwhile, brush seals are a widely used alternative to labyrinth seals. Their most valuable advantage over other sealing co...
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Jens Friedrichs, Sven Baumgarten, Günter Kosyna, and Udo Stark
Pág. 483 - 489
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