Searched for: department:"Aerodynamics%5C+and%5C+Wind%5C+Energy"
(1 - 14 of 14)
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Bakker, M. (author)
master thesis 2016
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Cheishvili, K. (author)
An end-to-end simulator for frequency scanning methods of filtered Rayleigh scattering (FSM-FRS) has been developed during the master thesis research at the German Aerospace Center (DLR). It can model several frequency scanning filtered Rayleigh scattering methods and predict the accuracies in measuring flow temperature, pressure, and velocity....
master thesis 2016
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Nayak Kallarbail, S. (author)
Oblique Shock-Wave Reflections or Shock Wave-Boundary Layer interactions (SWBLI) are complex phenomena which commonly occur in high speed flight. SWBLIs can have catastrophic consequences on the aircraft due to shock induced separation and unsteadiness of the interaction. These adverse effects can be mitigated by manipulating the boundary layer,...
master thesis 2016
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Van den Broecke, J. (author)
In this work a study was performed on the electrical, fluid-mechanical and net efficiency of nanosecond-pulsed dielectric barrier discharge (ns-DBD) plasma actuators. The plasma actuator efficiency was tested for dielectric barriers with a thickness between 0.5 and 1.5mm and made out of four different materials: Kapton, Lexan, PTFE and silicone...
master thesis 2016
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Zhang, Y. (author)
Based on the recently developed mimetic spectral element method, we propose an effective numerical scheme for solving three-dimensional periodic incompressible Euler flows, which spatially preserves mass, kinetic energy and helicity. Preserving multiple integral invariants numerically will significantly contribute to the stability and accuracy...
master thesis 2016
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Zhang, X. (author)
Air traffic noise, especially during the aircraft take-off and landing, has been universally acknowledged as a nuisance, for which reason, the International Civil Aviation Organization(ICAO) has ratified articles and established specifications aiming at the attenuation of air traffic noise, such as the Annex 16. The implementation of large...
master thesis 2016
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Shah, J. (author)
Aircraft noise has come under severe scrutiny due to growing number of airports and airline operations. The noise generated by high lift devices is now comparable to the turbofan engines due to increasing bypass ratios. A Gurney flap is a suitable starting point to study trailing edge flap aeroacoustics due to additional lift characteristics and...
master thesis 2015
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Janssen, R.F. (author)
The influence of laminar-turbulent transition on a propeller blade’s performance has been investigated in this study, both numerically and experimentally. The computational fluid dynamics (CFD) is performed using the TAU code developed by the German Aerospace Center, as well as an existing propeller lifting-line code. The laminar-turbulent...
master thesis 2015
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Desmedt, S.G.L. (author)
The area of interest for this study is the field of uncertainty quantification in computational fluid dynamics. The goal is to contribute to a new method to perform uncertainty quantification analyses for industrial, computationally expensive CFD simulations. To this end, an adaptive grid refinement method is developed. The existing sparse grid...
master thesis 2015
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Winkel, R. (author)
An experimental study aimed at the influence of different barrier materials on the energy deposition of nanosecond pulsed dielectric barrier discharge (ns-DBD) plasma actuator was carried out. Additionally, the direct effect of the discharge of an ns-DBD plasma actuator on a low velocity laminar boundary layer was investigated. Three barrier...
master thesis 2015
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Van Oostrom, J. (author)
In a previous study, the optimal re-entry trajectory of Hyperion-2 has been derived. The mission of the vehicle is to measure hypersonic boundary-layer transition, a phenomena in which the laminar boundary layer turns into a turbulent boundary layer. This is an important feature in hypersonic flow to investigate, as it introduces peak heating...
master thesis 2015
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Ahlfeld, R.B.H. (author)
Every spacecraft carries small rocket engines called thrusters for the purpose of orbit and position corrections in space. A precise operation of the thrusters saves fuel and a lower fuel consumption can extend the service life of the spacecraft. Precise thrust levels can be better obtained by pulsed firing than by continuous firing of the...
master thesis 2014
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de Oliveira, G. (author)
Actiflow is designing a new generation of wind turbine rotors enhanced by the use of passively powered boundary layer suction to improve the aerodynamic and struc­tural performance of thick profiles. As a part of this effort, this work explores the design space of airfoils with(out) boundary layer suction, outlines major design trends and...
master thesis 2011
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Zwang, L. (author)
master thesis 2009
Searched for: department:"Aerodynamics%5C+and%5C+Wind%5C+Energy"
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