The objectives of the Minnesota study were to determine the nature of
acoustic radiation from turbulent jets, with both Reynolds and Mach number
similitude. Acoustic data were to include intensity, directivity, spectra
and narrowband spatial coherence. Emphasis in the initial study was to be
on naturally developing jets. A second phase of the program was to be
aimed at artificially excited jets.
In order to carry out the experimental program as originally envisioned,
a special test facility had to be constructed. This test rig had
to produce jets of varying diameter, with minimal turbulence levels at the
nozzle erlt and be essentially free of acoustic contamination. As it
turns out, the latter requirement was essential to the successful completion
of the project. The desire to model high subsonic Mach number at low
Reynolds number necessitated high speed jets of very small diameter. The
high frequency content in these jets necessitated that special emphasis be
placed on both
Arndt, Roger E. A.; Long, Dean F..
Cooperative Investigation of Jet Flows.
St. Anthony Falls Laboratory.
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