| Citation: | ZHANG Junlong, QIN Chen, WANG Haitao, et al. Experimental study on mode characteristics of screech tone by rectangular supersonic jet[J]. Journal of Aerospace Power, 2025, 40（2）：20220553 doi: 10.13224/j.cnki.jasp.20220553
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The azimuthal mode characteristics of supersonic jet screech tone noise were studied for four converging rectangular jets of aspect ratios 1, 1.5, 2 and 10 and a round nozzle. All five nozzles had the same exit area and were tested in the same jet simulator facility on unheated conditions. Twelve microphones were arranged at equal azimuthal angles in the near-field of the nozzle outlet. The azimuthal angular distribution of the phase and amplitude of the screech tone of supersonic under expanded jet was obtained using the short-time cross power spectrum analysis method and the short-time filtered sound energy analysis method. It was found that the mode characteristics of rectangular supersonic under-expanded jet with aspect ratio of 1 were basically consistent with those of circular jet, while the mode characteristics of rectangular jet with aspect ratio greater than 1 were quite different from those of circular jet. At low Mach number, circular and rectangular jets with aspect ratio 1 showed stable axisymmetric modes, while rectangular jets with aspect ratio greater than 1 showed unstable mode characteristics. At higher Mach numbers, circular and rectangular jets with aspect ratio 1 exhibited unstable helical or oscillating modes, while rectangular jets with aspect ratio greater than 1 exhibited stable oscillating modes along the minor axis.
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