Abstract
Efforts to characterize and reduce noise emissions from high-performance fighter aircraft are often focused on the modeling and control of large-scale turbulence structures within the jet exhaust. In past investigations, these structures have been represented as oscillatory functions whose amplitudes grow then decay with distance from the jet nozzle, or wave packets. Recently, acoustical holography methods have been used to reconstruct the radiated field of a full-scale jet, including field properties at the source. Proper orthogonal decomposition of the reconstructed source region, based on the multiple signal classification (MUSIC) algorithm, provides a physically intuitive set of partial sources. Taken together, this set is an equivalent source representation of the large-scale structures. Individually, each partial source exhibits similar qualitative behavior to that of wave packet source models.
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