The flow around a he cigar-shaped body of revolution positioned along a free stream is studied. The experiments were performed in the low-turbulent wind tunnel T-324 at low speeds of flow up to 30 m/s. To gather the data on the flow around the body of revolution, the oil-black visualization, hot-wire anemometer were used, and the static-pressure distribution was obtained. It has been found that in the back part of the body a zone appears wherein the static pressure rises gradually, i.e. there is an unfavorable (positive) pressure gradient. From the experiments with 2D bodies, such as models of straight wings, it is known that a laminar separation bubble appears in the region of unfavorable pressure gradient, and the transition from the laminar to turbulent flow takes place in the boundary layer. Similar results were obtained in our experiments with the body of revolution.
|
