Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 10 of 10 for “"Hyperschall"”.
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Beeinflussung viskoser Strömungseffekte in Hyperschall-Einläufen
For the performance of air-breathing hypersonic space planes, the proper design of the inlet system is of great importance. One of the dominating flow phenomena inside such hypersonic inlets is the mutual interaction of oblique shocks with boundary layers, often leading to a separation of the …
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Einfluss einer Heckklappe auf die Düsenströmung im Hyperschall
This thesis deals with the flow field at a two-dimensional SERN-Nozzle. Main focus lies on the flow around the nozzle flap and the occurring separation of the boundary-layer of the outer flow. The objective is to get a better understanding of the interacting flow fields and to improve the nozzle …
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Einfluss der Wandtemperatur auf die Stoß-Grenzschicht-Wechselwirkung an einer Rampe im Hyperschall
The C4-metabolism in Maize (Zea mays) serves to efficiently concentrate CO2 near the enzyme RuBisCo. Therefore the photorespiration, as we can find in C3-plants, is suppressed. Although numerous investigations deal with the regulation of the C4-photosynthesis, a lot of factors which take part in it …
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Polyelectrolyte multilayers for plasmonics and picosecond ultrasonics
This thesis investigates the application of polyelectrolyte multilayers in plasmonics and picosecond acoustics. The observed samples were fabricated by the spin-assisted layer-by-layer deposition technique that allowed a precise tuning of layer thickness in the range of few nanometers. The first …
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Experimentelle Untersuchungen zur Düsen- und Heckströmung eines Scramjets
In the framework of the present thesis two different Single Expansion Ramp Nozzles (SERN) were experimentally investigated. For these experimental investigations existing measurement techniques (PSI, Pitot, Schlieren photograph) and additional measurement methods (Pressure Sensitive Paint, …
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Reynolds stress model for hypersonic flows
Despite the enormous increase in computational capabilities and the use of computational fluid dynamics as a design tool in the aircraft industry, the correct prediction of complex hypersonic turbulent flows involving shock wave boundary layer interaction (SWBLI) is still a challenge. For the …
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Experimentelle Untersuchung der Innenverdichtung eines Hyperschalltriebwerkeinlaufs mit Überschalldurchströmung
The main topic of the research project is the experimental investigation of the inner compression of ramjet inlets with supersonic combustion (scramjet). The work focuses on the isolator section, located between the Inlet and the combustion chamber. The main Task of the isolator is he deceleration …
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Spectroscopic perspectives on ultrafast coupling phenomena in perovskite oxides
In this thesis, I study ultrafast dynamics in perovskite oxides using time resolved broadband spectroscopy. I focus on the observation of coherent phonon propagation by time resolved Brillouin scattering: following the excition of metal transducer films with a femtosecond infrared pump pulse, …