Flow Phenomena Past Fuselages and Wing-Fuselage Systems of Gliders.

The paper contains the results of visualization tests and measurements of the velocity field in diffusion regions (with a positive pressure gradient) for fuselages and transition regions between the wing and the fuselage. Both wind tunnel and flight tests were performed. The discussion concerns phenomena of secondary flow influencing the separation acceleration, and the influence of the geometrical shape of the wing-fuselage system on the occurrence of secondary flows of various type is discussed. Various types of flow separation in the region of the wings adjacent to the fuselage are depicted in photographs. The principle of correct design of fuselages and transition zones between the wing and the fuselage is discussed, the objective being to minimize the harmful effects of secondary flows on the flow separation process.