Bachelorarbeit / Masterarbeiten Separation control with air-jet vortex generators in a shock-wave/turbulent-boundary-layer interaction (a) Mean streamwise velocity (U/U ∞ ) of the baseline case from PIV showing the massive separation region Jet induced separation Jet orifices Footprint of the streamwise vortices Corrugated separation line Separation line Reattachment line Flow direction L sep Ramp corner (b) Oil-flow visualisation showing the effect of air-jet injection on the flow. Flow field around high speed vehicles are characterised by frequent occurrence of shock- wave/boundary-layer interactions. A strong shock- wave imposes a large adverse pressure gradient on the boundary layer and can induce large scale separa- tion. This interaction can lead to high local fluctuating pressure and thermal loads detrimental to the vehicle structure. Hence, effective control of these phenom- ena is necessary for cheaper and more efficient air and space transportation. A promising approach is based on the injection of air-jets into the boundary layer. The streamwise vortices generated by these air-jets re- distribute the momentum within the boundary layer, making it more resistant to separation. The effec- tiveness of air-jet vortex generators in mitigating flow separation has been verified in subsonic, transonic and supersonic flow conditions. However, further studies are essential to understand the underlying governing mechanism. In the framework of this proposed the- sis, state-of-the-art experimental techniques will be used to study the influence of air-jet vortex genera- tors on shock wave / turbulent boundary layer interac- tions. This project is embedded in the Emmy Noether Program of the German Research Foundation, details of which can be found in http://gepris.dfg. de/gepris/projekt/326485414. Requirements - Good Knowledge of Fluid Mechanics (Compressible flows is an added plus). - Experience with CAD designing (Catia/Inventor) (bonus). - Knowledge of Matlab (preferable). - Affinity for performing practical work. - Preference to write the Master thesis report in English. - Enthusiasm to work in a project that would one day pave the way for efficient high speed flight.
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Bachelorarbeit / Masterarbeiten
Separation control with air-jet vortex generators in ashock-wave/turbulent-boundary-layer interaction
(a) Mean streamwise velocity (U/U∞) of thebaseline case from PIV showing the massive
separation region
Jet induced separation
Jet orifices
Footprint of thestreamwise vortices
Corrugated separation line
Separation line
Reattachment line
Flow direction
LsepRamp corner
(b) Oil-flow visualisation showing the effect ofair-jet injection on the flow.
Flow field around high speed vehicles arecharacterised by frequent occurrence of shock-wave/boundary-layer interactions. A strong shock-wave imposes a large adverse pressure gradient onthe boundary layer and can induce large scale separa-tion. This interaction can lead to high local fluctuatingpressure and thermal loads detrimental to the vehiclestructure. Hence, effective control of these phenom-ena is necessary for cheaper and more efficient air andspace transportation. A promising approach is basedon the injection of air-jets into the boundary layer.The streamwise vortices generated by these air-jets re-distribute the momentum within the boundary layer,making it more resistant to separation. The effec-tiveness of air-jet vortex generators in mitigating flowseparation has been verified in subsonic, transonic andsupersonic flow conditions. However, further studiesare essential to understand the underlying governingmechanism. In the framework of this proposed the-sis, state-of-the-art experimental techniques will beused to study the influence of air-jet vortex genera-tors on shock wave / turbulent boundary layer interac-tions. This project is embedded in the Emmy NoetherProgram of the German Research Foundation, detailsof which can be found in http://gepris.dfg.de/gepris/projekt/326485414.
Requirements- Good Knowledge of Fluid Mechanics (Compressible flows is an added plus).- Experience with CAD designing (Catia/Inventor) (bonus).- Knowledge of Matlab (preferable).- Affinity for performing practical work.- Preference to write the Master thesis report in English.- Enthusiasm to work in a project that would one day pave the way for efficient high speed flight.
Tasks- A brief literature survey on separation control in high speed flows.- Active participation in the experimental campaign.- Analysis and post-processing of the obtained data.- Discussion of the results and comparison with literature.- Submission of final thesis report.
Contact:If you have any questions / are interested and would like to know more about the project, feel free to sendan email with your CV or pass by our office.
Deepak Prem Ramaswamy, M.Sc.AIA - Institute of Aerodynamicsand Chair of Fluid Mechanics,Room: 103RWTH Aachen University,Wullnerstraße 5a,52062 Aachen, Germany.Tel: : (+49 241) 80 90400Email: [email protected]
Dr.-Ing. Anne-Marie SchreyerAIA - Institute of Aerodynamicsand Chair of Fluid Mechanics,Room: 101RWTH Aachen University,Wullnerstraße 5a,52062 Aachen, GermanyTel: (+49 241) 80 95188E-Mail: [email protected]
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