student profile: Mr Beau Emmerson


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Thesis work

Thesis title: Low Reynolds Number Post Stall Aerodynamics

Supervisors: Doug AULD , Dries VERSTRAETE

Thesis abstract:

Blade element theory is used to predict the performance of propellers and rotors. One of the biggest problems with blade element code is the prediction of the lift and drag due to the change in Reynolds number and angle of attack over the blades. Sections of the blades can be stalled and therefore initial estimates for lift and drag can be inaccurate.�br /� �br /� Post stall aerodynamics is one of the fastest emerging research fields in aerodynamics due to the increase in the need for data. The data for post stall aerodynamics can be used in the design and verification of propellers, wind turbines and rotors. Limited sources for low Reynolds number post stall data are available and this thesis aims to fill this gap. While some data exists for high Reynolds numbers, low Reynolds data is scarce. With the small UAV market rapidly emerging around the world, the need for smaller propellers is evident. This is where the data that this thesis will provide is required. The data will also be instrumental to improve small wind turbines and helicopter rotors. When a propeller or rotor is spinning the angle of attack changes rapidly, this change in angle of attack can affect the performance. Dynamic testing will also be required to see how the aerofoil reacts when going from pre to post-stall in a short time period.

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