21st Congress of International Council of the Aeronautical Sciences, Melbourne, Australia, 13-18 September, 1998
Paper ICAS-98-3.5.3

VECTORING JETS INFLUENCE ON UNDER-WING STORES RELEASE TRAJECTORIES WITH AND WITHOUT SIDE-SLIP EFFECTS, THEORY AND EXPERIMENT

Nangia R. K., Robinson G.*, Ross J. A*, Peto J. W.*
Nangia Aero Research Associates, United Kingdom; * DERA, United Kingdom

Keywords: jets, under-wing stores release trajectories, side-slip effects, theory, experiment

The carriage of external stores (bombs and ferry tanks) and their "accurate" and "safe" release and delivery is an important aspect in design and operation of combat aircraft. The ASTOVL aircraft with vectoring jets operate under very "perturbed" flow-fields during the transition phase and large side-slips occur only too easily. The formulations of the jet models using Navier-Stokes or Euler solvers, have not yet reached sufficient maturity to become "ready" tools for design and analysis. Emphasis has therefore been placed on adapting empirical models of jets in established wing theory to predict forces and moments over a 3-D flow grid. This information in turn formed the input to a trajectory code. Results from purely theoretical approach are encouragingly very similar to those obtained from the data based on experiment

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