Abstract
This paper discusses an analytical/numerical model developed to describe the behavior of gaseous jets injected transversely into a subsonic (but compressible) crossflow. The cross section of the jet is modeled as an inviscid, compressible vortex pair, consistent with experimental observations of the transverse jet cross section. The numerically computed behavior of the vortex pair is used as an input to mass and momentum balances along the jet, forming a model that describes the trajectory, entrainment, and mixing of jets injected into subsonic crossflows in the range 0.15 < Mx < 0.8. Theoretical predictions of jet trajectories are compared with limited experimental data, yielding accuracy within 10%. Because very short computational times are required for this model, it could serve as an excellent design tool for perfectly expanded or slightly underexpanded jets in subsonic crossflow. Nomenclature B = constant used in defining jet cross-sectional area d = jet orifice diameter Fy = dimensionless force tending to separate vortices due to compressibility associated with vortex pair Fyp = dimensionless force tending to separate vortices due to
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