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<p>This paper presents the estimation of far-field levels in an open wind tunnel of a conventional aircraft half-span model in high-lift configuration at the directivity angles 55°, 83°, 99°, 114°, and 136° with 3D conventional beamforming and CLEAN-SC with shaded sub-arrays. Reference measurements of the sound pressure level were taken using far-field microphones placed at different distances. The beamforming-based predictions are derived by projecting CLEAN-SC source levels to the far-field, based on the assumption of spatially uncorrelated monopole sources. The estimated far-field sound pressure levels show good agreement with reference measurements at forward and sideward angles, while increasing underprediction is observed at rearward angles due to shear-layer decorrelation.</p>

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Far-field level estimation in open wind tunnels with beamforming and CLEAN based on source coherence

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月10日

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  • Armin Goudarzi,
  • Daniel Ernst,
  • Thomas Ahlefeldt,
  • Florian Philipp,
  • Carsten Spehr

摘要

This paper presents the estimation of far-field levels in an open wind tunnel of a conventional aircraft half-span model in high-lift configuration at the directivity angles 55°, 83°, 99°, 114°, and 136° with 3D conventional beamforming and CLEAN-SC with shaded sub-arrays. Reference measurements of the sound pressure level were taken using far-field microphones placed at different distances. The beamforming-based predictions are derived by projecting CLEAN-SC source levels to the far-field, based on the assumption of spatially uncorrelated monopole sources. The estimated far-field sound pressure levels show good agreement with reference measurements at forward and sideward angles, while increasing underprediction is observed at rearward angles due to shear-layer decorrelation.