CFD Support for Jet Noise Reduction Concept Design and Evaluation for F/A 18 E/F Aircraft

摘要

CFD is being used to support the design and evaluation of varied passive concepts which have the potential to reduce jet noise on an F/A 18 E/F supersonic fighter aircraft. One aspect of the CFD support work entails basic concept evaluation which is being performed in collaboration with laboratory studies of Krothapalli at FSU and Seiner at NCPA/U.Miss. Concepts evaluated to date include microjets, chevrons and hybrid devices. CFD is supporting the optimization of these designs and evaluating how they will perform on a real engine. A new jet noise code is being evaluated which has the promise of quantifying the noise reduction obtainable. A major role is that of ascertaining the effect of plume/plume interactions as well as installation /aerodynamic effects which requires a very detailed, CPU intensive studies. Improvements to the CFD in the areas of RANS turbulence modeling are improving overall accuracy, while efficiency upgrades have been achieved via use of adaptive gridding on massively parallel architectures, as well as by use of new parabolized approximations.