University of Twente Student Theses
A study on the effect of local pressure gradient on turbulent boundary layer characteristics and trailing-edge noise over a flat plate : A numerical and empirical study
Vliem, M.J.H. (2024) A study on the effect of local pressure gradient on turbulent boundary layer characteristics and trailing-edge noise over a flat plate : A numerical and empirical study.
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| Abstract: | This thesis investigated noise generation mechanisms by turbulent boundary layers, particularly trailing-edge noise. This mechanism is significant in various engineering applications such as wind turbine and aircraft. Amiet’s trailing-edge noise model serves as the foundation of this study. Its semi-empirical parameters, often based on a single flat plate assumption, struggle with real-world applications where the turbulent boundary layer experiences local disturbances and non-equilibrium effects. This study aims to understand how local disturbances to the turbulent boundary layer impact noise generation. This is done by investigating the effect of imposing a local pressure gradient on the characteristics of the turbulent boundary layer, which is critical to Amiet’s trailing-edge noise model. Using both Computational Fluid Dynamics (CFD) simulations and wind tunnel validations, the study examines a flat plate setup with strategically placed counter bodies to induce a local pressure gradient. The results show that the counter body height and angle of attack affect boundary layer properties and trailing-edge noise levels, as observed in the experiments. This work primarily establishes and validates a framework enabling further studies on non-equilibrium effects on boundary layer conditions and trailing-edge noise, ultimately advancing semi-empirical noise prediction models for practical applications. |
| Item Type: | Essay (Master) |
| Faculty: | ET: Engineering Technology |
| Subject: | 33 physics, 43 environmental science, 52 mechanical engineering |
| Programme: | Mechanical Engineering MSc (60439) |
| Link to this item: | https://purl.utwente.nl/essays/104531 |
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