Abstract
New facilities for ground running of engines in Royal Australian Air Force F/A-18 aircraft feature air-cooled exhaust augmentors for noise suppression. Aerothermodynamic aspects of the augmentor designs were appraised in some detail, making use of isothermal scale model tests, ejector theory, and available empirical data. Quantitative assessments were made of cooling flow pumping performance, and geometric features were identified which are important to the symmetry of the flow in the augmentor ducts. The final designs displayed satisfactory aerodynamic behavior, tolerant to both inlet asymmetries and reasonable levels of engine jet misalignment. The estimated pumping performance exceeded the design requirements.
Published Version
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