The far-field radiation characteristic and the noise source distribution of rectangular jet with aspect ratios 1, 1.5, 2, 10 are measured based on the jet noise simulator and the results are analyzed. The differences of the far-field noise frequency spectrum at specified azimuth plane between the round jet and the rectangular jet with different aspect ratios are presented, which shows the noise reduction potential of the rectangular nozzles. The changing of jet noise peak location with frequency of rectangular jet is obtained through the microphone array with beamforming algorithm. The influences of jet velocity, azimuth angle, and aspect ratio on the rectangular jet noise source distribution are systematically analyzed. The jet velocity and azimuth angle have little effect on the normalized jet noise source distribution, whereas the aspect ratio has a large impact. With the increase of the aspect ratio, the low frequency noise peak of rectangular jet moves upstream, and the high frequency noise peak moves downstream.
ZHANG Junlong
,
LEI Hongsheng
,
TIAN Hao
,
LI Jie
. Noise radiation characteristics and source distribution of subsonic rectangular jet[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2020
, 41(2)
: 123386
-123386
.
DOI: 10.7527/S1000-6893.2019.23386
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