每年出版 4 期
ISSN 打印: 1065-3090
ISSN 在线: 1940-4336
Indexed in
VISUALIZATION OF TIP VORTEX/AIRFOIL INTERACTION
摘要
The effects of the vortical wake shed by a finite wing on a two-dimensional airfoil situated downstream were studied. Two forms of flow visualization were employed. First, the downstream airfoil boundary-layer behavior was studied using surface-film visualization. This consisted of smearing a mixture of propylene glycol and fluorescein onto the downstream airfoil, and viewing the resulting flow patterns under ultraviolet light. Second, the trajectory of the tip-vortex shed by the forward surface was examined using a kerosene vapor tracer. The freestream Reynolds number, based on the downstream airfoil chord length, was 150,000 for all tests. The surface-film visualization technique proved to be a very effective method for locating regions of separated flow on the airfoil. The smoke visualization provided good indication of the position of the tip-vortex relative to the two lifting surfaces. Several examples of both techniques are included in the paper.