GASEOUS JET IN SUPERSONIC CROSS-FLOW

This paper describes an analytical/numerical model representing the deflection and mixing of a single gaseous jet in supersonic crossflow. The jet cross section is modeled in terms of a compressible vortex pair that results from viscous and impulsive forces acting at the periphery of the jet. The behavior of the vortex pair is then combined with mass and momentum balances along the axis of the jet to form a model that describes the trajectory and mixing of the injected fluid. Due to complications associated with a supersonic crossflow, a numerical technique is used to solve for the inviscid outer flow and the position of the bow shock that envelopes the jet. This solution, combined with the computed flow field of the compressible vortex pair associated with the jet, allows prediction of trajectories of these types of gaseous jets. Although there are limited experimental data for comparison with computed results, the present model is able to predict overall jet penetration (for perfectly or slightly underexpanded jets) to within 10% while requiring only a few seconds of computer time. © 1990 American Institute of Aeronautics and Astronautics, Inc., All rights reserved.