Publikationsdatum:
2019-07-13
Beschreibung:
Recent 1/4 scale and engine size nozzle acoustic data, for both 37-tube and single nozzles, were used to test the jet-shielding principle. At low jet velocities the multitube nozzle total sound power approaches the equivalent of 37 single tubes (no shielding), while near-sonic and above, the small equivalent number of single tubes compares well with a geometric model of lateral radiation from only about a third of the circumference of the outer jets (nearly complete shielding). At high jet velocities, the geometric shielding hypothesis is in excellent agreement with acoustic data from which the downstream coalesced jet noise is excluded. Present results are compared with an existing correlation for single jets, and with previous publications on multijet shielding.
Schlagwort(e):
FLUID MECHANICS
Materialart:
NASA-TM-X-71450
,
E-7690
,
Aeroacoustic Specialists Conf.; Oct 15, 1973 - Oct 17, 1973; Seattle, WA; United States
Format:
application/pdf
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