Andrade da Costa, M. Pedro Octávio (2024) Control of a detached flow using real-time PIV measurements PRE - Research Project, ENSTA.
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Abstract
This project focused on investigating the impact of control on a detached flow by analyzing the reduction of the recirculation area downstream of a Backward Facing Step (BFS) geometry in a hydrodynamic tunnel using a Real Time Optical Flow Particle Image Velocimetry (RT-OFPIV) . The study also involved characterizing turbulent flow and its boundary layer, as well as data acquisition methods such as optical flow PIV and its real-time implementation. The project enabled the mapping of recirculation area reduction (RAR) across a wide range of parameters, including different excitation amplitudes and frequencies. The method proved effective in achieving the reduction of the recirculation area. Based on the time series and Power Spectral Density (PSD) study, trends suggest that high excitation amplitudes yield minimal performance gains compared to lower amplitudes with its appropriates frequencies of actuation, since the system seems to loss sensitivity to excitation frequency at highers amplitudes. We can infer an optimal actuation point as being an intermediate amplitude combined with an appropriate excitation frequency. This approach minimizes the energy expenditure required to operate the system while still achieving satisfactory performance for the intended objectives.
Item Type: | Thesis (PRE - Research Project) |
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Uncontrolled Keywords: | Flow control, recirculation area reduction (RAR), Backward Facing Step (BFS), particle image velocimetry (PIV), real-time optical flow (RT-OFPIV), turbulent flow, boundary layer detachment. |
Subjects: | Fluid Mechanics and Energy |
ID Code: | 10166 |
Deposited By: | Pedro octavio ANDRADE DA COSTA |
Deposited On: | 27 août 2024 17:47 |
Dernière modification: | 27 août 2024 17:47 |
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