Colloquium: Haozhe Zeng (FPT)

In this thesis work, both experimental and theoretical approaches are utilized to investigate the flow evolution of tubercled wings at pre-stall and post-stall angles of attack. In the experimental study, the 2D Particle Image Velocimetry technique is used to measure the flow patterns at cross-flow planes. At a pre-stall AoA, the interaction between leading edge vortices and laminar separation bubbles results in complex flow patterns at downstream planes. At a post-stall AoA, stall cells are observed their formation is found to depend on both the Re number and tubercle amplitude. In the theoretical study, both LLT-type models and panels are utilized to capture the characteristic LEV of the wing and are shown to be not effective. Crow’s model is adapted for cases where LEV is significant, the attempt demonstrates a possible solution of investigating the stall cell spacing.

Supervisor: Dr. Morgan Li, Dr. Steven Hulshoff