Rarefaction behind a planar jet developing in a confined stalling flow

Methods are proposed for describing the rarefaction developing in the zone of counter-current streams behind a jet flowing out of an infinitely long gap into a confined stream. The calculations assume a potential flow of the outside jet, a constant pressure in the reverse current zone behind the jet, the elliptical shape of the displacement body formed by the jet, and the absence of wall friction; they rely on previously made formulations for an unrestricted cross-stream. Analytical results are corroborated by experiments and exhibit good agreement, except for strong suction with q (jet-to-stream velocity head ratio) values of 97.6 which cause anomalies in the pressure distribution measurements.