An experimental investigation of a jet issuing from a wing in crossflow.

The aerodynamic interference resulting from a jet issuing normal to the chordal plane of a twodimensional wing in a crossflow has been experimentally investigated. Measurements of the interference surface pressure distribution on the wing and of the wing interference force and moment coefficients have been made for a systematic variation of jet exit location, jet exit diameter, wing angle-of-attack, and the ratio of jet exit velocity to freestream velocity, A. A comparison of the contours of constant interference surface pressure on the wing lower surface with those for an infinite flat plate reveals that they are much the same for A > 6. The dissimilarity becomes greater as X is decreased, primarily through the growth of an extensive region of positive interference surface pressure forward of the jet on the wing. Interference lift losses of approximately the same magnitude for all geometries were observed for X > 6. However, a lift augmentation occurred for X < 6 which was attenuated by increases in angle-of-attack, forward movement of the jet exit location, and decreases in jet exit size. The data indicate that the character of the interference flow is distinctly different for high and low values of the velocity ratio.