PROJECT TITLE : Turbulence Modeling Framework for Analysis of Subsonic/Supersonic Jet Noise Reduction Concepts
TECHNICAL ABSTRACT (LIMIT 200 WORDS)
A primary limitation in our ability to analyze jet noise reduction concepts stems from deficiencies in the turbulence models utilized. From a practical viewpoint, a simple two-equation model framework (e.g. ke) is desirable, yet it requires corrections (compressibility, vortex-stretching, etc.) whose unification is complex. More advanced models (non-linear ke, algebraic or full Reynolds-stress) have not yet demonstrated invariance for building-block unit problems forming the basis for the analysis of jet noise reduction flowfields. This proposed research program establishes an overall framework for practical turbulence model utilization based on detailed and systematic data comparisons. It provides the means to evaluate new/advanced turbulence models in an efficient and organized manner so that deficiencies can quickly be identified. This effort involves organization of jet data into building-block format, construction of a hierarchy of jet turbulence research computer codes (asymptotic, parabolic, PNS, RNS, LES), inclusion of varied turbulence models into these codes, and, establishment of procedures for selection of "best available" turbulence modeling frameworks for analysis of specific jet noise reduction concepts. The overall approach is a dynamic one and as more data and/or advanced models become available, improved frameworks will become available.POTENTIAL COMMERCIAL APPLICATIONS
The proposed research supports commercial applications to noise reduction concepts now being investigated under the HSR and AST programs. It also supports other commercial activities of airframes and engine companies related to the design of next-generation aircraft and propulsive systems, which require utilization of improved turbulence models emphasizing aeropropulsive flowfields which influence jet noise emission.NAME AND ADDRESS OF PRINCIPAL INVESTIGATOR
NAME AND ADDRESS OF OFFEROR
Combustion Research and Flow Technology, Inc.
174 North Main Street, Building 3
P.O. Box 1150
Dublin, PA 18917