Abstract
Flow around a circular cone mounted on a flat plate has investigated with flow visualization in a thin laminar boundary layer. The apex angle of circular cone is in the range of 2α?90° and the height H is 50 mm. Then, the Reynolds number based on the height of the circular cone is 1010 and the relative boundary layer height δ/H is almost 0.41. The flow visualization was conducted by means of a dye injection. Necklace vortices (Primary and secondary vortices) are formed around the circular cone. The front stagnation height Y s, which is a representative length scale of the necklace vortex, tends to increase with 2α less than 2α?45°. The streak lines at topside of the front stagnation height have a curvature near the circular cone and the curvature increases with 2α. From pressure gradients in the neighborhood of the stagnation point, semi-empirical formula on Ys/H was proposed as a function of a and δ/H. The formula is well consistent with the data of the present flow visualization and other researchers.
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