Aerothermodynamic Design Appraisal of Noise Suppressors for F/A-18 Engine Run-Up Facilities at RAAF Williamtown
Abstract
Upgraded facilities for ground running of F404 engines in F/A-18 aircraft at RAAF Williamtown will 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. In initial design development, quantitative assessments were made of cooling flow pumping performance. Changes were recommended to improve the aerodynamic characteristics of the exhaust augmentors and eliminate high risk features, and the sizes of the augmentor ducts were significantly reduced. The model tests identified certain geometric features which were important for symmetry of the flow in the augmentor ducts and to pumping performance. Once modified accordingly, the designs displayed satisfactory aerodynamic behaviour, which was tolerant to both inlet asymmetries and reasonable levels of engine jet misalignment. The pumping performance was shown to exceed the design requirements.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1990
- Accession Number
- ADA236058
Entities
People
- A. M. Abdel-fattah
- S. A. Fisher