Unsteady aerodynamics in the low Reynolds number domain is of great interest in applications to Micro Air Vehicles (MAVs), especially with respect to flow over, and in the wake of, pitching aerofoils. The massively separated flow over the upper surface of the pitching aerofoil allows for the production of large transient peaks of lift at this scale. This paper extends our previous work1 to multi-dimensional (3D), multi-component (3C) measurements of this phenomenon by using Tomographic Particle Image Velocimetry (Tomo-PIV). For this purpose the three-component, three-dimensional (3C-3D) velocity fields in the wake of a flat plate undergoing a pitch-hold-return motion is investigated. The experiments are conducted in a water tunnel at a Reynolds number of 7,500 and a dimensionless pitching rate of Kc = 0.93. The instantaneous and phase averaged evolution of the trailing edge vortices is investigated, highlighting the three-dimensional organisation of the coherent vortex structure and its spanwise variation.
|Title of host publication||40th AIAA Fluid Dynamics Conference|
|Publication status||Published - 2010|
|Event||40th AIAA Fluid Dynamics Conference - Chicago, IL, United States of America|
Duration: 28 Jun 2010 → 1 Jul 2010
|Conference||40th AIAA Fluid Dynamics Conference|
|Country||United States of America|
|Period||28/06/10 → 1/07/10|