according to German TVöD 13
Expressions of interest are sought for an exceptional PhD candidate to conduct fundamental research on the topic of jet aerodynamics and jet noise and further development of the 4-pulse Shake-The-Box Lagrangian particle tracking techniques. Jet noise remains an important topic today as it makes up a significant portion of the total noise of a starting and landing aircraft. Commercial airliners have made large efforts to reduce this noise in order to comply with noise restrictions and future standards. Active research in the field has already seen the implementation of suppression strategies such as chevron nozzles (used by modern day aircraft such as the Boeing 787). But the mechanisms by which turbulent jet flows produce noise are still not fully understood. The continued design and development of low noise jet engines will be further enhanced by improving the understanding of these mechanisms. In the past, experiments have only provided limited information about the jet aerodynamics and -acoustics, due to the inability to obtain instantaneous and high spatial resolution measurements in a volume. Recent developments at DLR in advanced Lagrangian Particle Tracking (LPT), namely the Shake-The-Box (STB) algorithm, together with Navier-Stokes-regularized interpolation methods (FlowFit) have shown promising means to provide the required information to link the aerodynamic aspects of the flow (sources of sound) with the acoustic aspects (noise) emanating from the flow. In that regard, a high quality and extensive experimental test campaign using the multi-pulse STB technique combined with synchronized microphone aeroacoustics measurements on a round and chevron nozzle at high subsonic flow speeds has been completed in 2016. The preliminary results have shown promise for unprecedented spatial resolution and with the potential for further analysis to provide a wealth of information never before achieved in the field.
The PhD candidate will conduct:
DLR is offering a unique opportunity to be involved in a fundamental research study at the same time providing comprehensive and interdisciplinary training, with a work programme consisting of both computational and experimental components. The scientific training takes place in a dynamic and excellent scientific environment of modern facilities and under a pioneering, innovative world renowned team and in cooperation with various universities. The candidate must have aerodynamics or fluid mechanics background with a preference for experience in advanced experimental techniques and strong programming skills.
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Disabled applicants with equivalent qualifications will be given preferential treatment.
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Dr. Andreas Schröder
Institute of Aerodynamics and Flow Technology
Phone: +49 551 709-2190