| Citation: | YANG Yi, GOU Jinlan, LE Guigao, et al. Study on noise characteristics of supersonic under-expanded jets with twin-nozzle[J]. Journal of Aerospace Power, 2025, 40（2）：20230276 doi: 10.13224/j.cnki.jasp.20230276
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In order to explore the flow field characteristics and noise propagation mechanism of an under-expanded supersonic jet under different nozzle spacing conditions, a numerical model was established based on the large eddy simulation (LES) method to calculate the flow field structure of under-expanded supersonic jet and the noise sound pressure distribution law of near-far field. The effects of the number of nozzles and the distance between nozzles on the sound field were studied. The far-field noise characteristics of different positions and angles were obtained based on the Ffowcs Williams-Hawkings (FW-H) equation; the near-field noise characteristics were obtained by performing Fourier transform on the time-domain pressure fluctuation signals of the near-field receivers. The results showed that under the condition of two kinds of nozzle spacing, the twin-jet presented symmetrical and anti-symmetrical flapping modes (at fundamental frequency); and compared with the single jet, the difference of the twin-jet flapping mode made the whistling frequency shift. When the distance between nozzles was small, the near-field pressure fluctuation intensity of twin-jet was greater, and the amplitude of near-field noise sound pressure level was larger. The peak frequency of the sound pressure level in the far field of the jet increased with the increase of the observation angle, but in the twin-jet plane, the change trend of noise directivity was the same under both working conditions.
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