Near-Wake of a Circular Cylinder With a Spanwise Periodic Trailing Edge SplitterPlate

摘要

The wake of a circular cylinder subjected to geometrically-imposed, three-dimensional disturbances by a spanwise periodic trailing edge splitter plate is experimentally investigated. The results are compared to that of a plain cylinder and a cylinder with a two-dimensional splitter plate. The introduction of a spanwise periodic trailing edge splitter plate affects the base pressure along the span of the cylinder. As the base pressure increases, the vortex formation region is extended and the width of the wake decreases. Vortex shedding is altered, the drag force is reduced, and the base pressure is modified to produce spanwise cross-flow between the valleys and the peaks. Spanwise frequency variation, as well as the presence of two shedding frequencies at the location of a peak in the periodic splitter plate are observed. Based on these experimental measurements and flow visualization, the existence of vortex dislocations is noted.