Round Jets in a General Stream

Abstract : The flow in a round jet issuing from an orifice in the same direction as a general external stream, is investigated theoretically as an extension of the problem of a jet issuing into still air. The flow in the upstream part of the jet in which a core of fluid of uniform velocity exists, and the flow in the downstream or developed part of the jet, are investigated separately; the solutions fitted together at the section at which the core disappears. The deviation of the outside stream due to inflow into the jet is also considered. Numerical solutions are derived for several values of the ratio of jet exit velocity to stream velocity.