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QIN Chen, ZHANG Junlong, YANG Mei, et al. Acoustic normalization characteristics of jet impingement: overall sound pressure level and spectra[J]. Journal of Aerospace Power, 2025, 40（1）：20230125 doi: 10.13224/j.cnki.jasp.20230125
Citation: QIN Chen, ZHANG Junlong, YANG Mei, et al. Acoustic normalization characteristics of jet impingement: overall sound pressure level and spectra[J]. Journal of Aerospace Power, 2025, 40（1）：20230125 doi: 10.13224/j.cnki.jasp.20230125
shu

Acoustic normalization characteristics of jet impingement: overall sound pressure level and spectra

doi: 10.13224/j.cnki.jasp.20230125
  • 1.

    State Key Laboratory of Aerodynamics，China Aerodynamics Research and Development Center，Mianyang Sichuan 621000，China

  • 2.

    Key Laboratory of Aerodynamic Noise Control，China Aerodynamics Research and Development Center，Mianyang Sichuan 621000，China

  • Received Date: 2023-03-03
    Available Online: 2024-08-05
    Abstract

  • For the improvement of jet noise modeling, comprehensive analysis of experimental data was conducted to study the normalization characteristics of jet impingement noise. The experiment of subsonic jet impingement on an inclined plate was carried out in a full anechoic chamber. A microphone arc array was applied to collect the far field sound data. The nth power law of jet velocities was utilized to analyze the jet impingement noise. The results of overall sound pressure level (OASPL) showed a good agreement with the nth power law, but the velocity factors (n) varied in the observation directions (θ). The velocity factors of OASPL in directions of 30°, 90° and 120° were 6.8, 8.0 and 9.7, respectively. After normalization, the narrow-band sound pressure level spectra collapsed well and the velocity factors of main band were 7.5 and 10.0, respectively in the directions of 30° and 120°. It can be established that the growth rates of impingement noise were significant higher than the 8th power law in the upstream directions. Moreover, the normalization results and velocity factors indicated that the impingement noise had a little effect on downstream directions. It was found that wall jet-related noise dominated in downstream direction, and the spectra presented dipole noise and quadrupole noise in band of St<0.2 and 0.2≤St≤2 respectively in the direction of 30°.

     

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