简介:The separation bubble on a NACA 0012 airfoil with a two-dimensional, constant span,
simulated leading-edge glaze-ice accretion is investigated using Particle Image Velocimetry
(PIV). Chordwise PIV measurements, or thos简介:The separation bubble on a NACA 0012 airfoil with a two-dimensional, constant span,
simulated leading-edge glaze-ice accretion is investigated using Particle Image Velocimetry
(PIV). Chordwise PIV measurements, or those along the separation bubble cross-section,
are obtained at a Reynolds number of 0.9x106, Mach number of 0.20, and between 0 deg
and 5 deg angle-of-attack. Mean reattachment estimated from surface oil-flow visualization
indicates increasing bubble length and unsteadiness (based on reattachment zone width)
with angle-of-attack, consistent with results extracted from PIV measurements. Timeaveraged
streamlines and forward flow intermittency reveal a primary recirculation with
clockwise rotation defined by a shear layer and a smaller, secondary recirculation with
counter-clockwise rotation directly downstream of the point of separation, both consistent
with backward-facing step type flowfields. Mean and RMS velocity component contours
highlight these features and wall-normal profiles are extracted and compared to other
separation bubble data including those over a backward-facing step and blunt flat plate.详细>