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To address the characteristics of engine fan noise sources and their propagation mechanisms, this study employs a finite element method for solving time-linearized Euler equations to predict acoustic propagation in engine nacelles. The numerical approach was validated using NASA’s JT15D inlet model, demonstrating prediction errors below 3 dB. A full-scale segmented nacelle acoustic liner test article was designed and manufactured, incorporating spatial layout optimization that accounts for modal scattering and reflection effects. An experimental platform utilizing rotating modal generation technology was established to simulate realistic engine fan noise under laboratory conditions. Test results show that the peak-to-peak noise reduction of the segmented liner reaches 16.4 dB under design conditions (1,250 Hz, 15th-order mode), with a minimum 5.6 dB reduction observed across 0°–90° polar angles at 4 m radius. The axial segmentation strategy effectively enhances higher-order modal scattering absorption, providing insights for nacelle liner design and validation.

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Aerodynamic Noise Reduction Design and Experimental Validation of Full-Scale Segmented Nacelle Acoustic Liners

  • 会议论文

  • 发表日期：

    2026年

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  • Zhuohan Li,
  • Qun Yan,
  • Dongwen Xue,
  • Jiafeng Yang,
  • Yonghui Chen

摘要

To address the characteristics of engine fan noise sources and their propagation mechanisms, this study employs a finite element method for solving time-linearized Euler equations to predict acoustic propagation in engine nacelles. The numerical approach was validated using NASA’s JT15D inlet model, demonstrating prediction errors below 3 dB. A full-scale segmented nacelle acoustic liner test article was designed and manufactured, incorporating spatial layout optimization that accounts for modal scattering and reflection effects. An experimental platform utilizing rotating modal generation technology was established to simulate realistic engine fan noise under laboratory conditions. Test results show that the peak-to-peak noise reduction of the segmented liner reaches 16.4 dB under design conditions (1,250 Hz, 15th-order mode), with a minimum 5.6 dB reduction observed across 0°–90° polar angles at 4 m radius. The axial segmentation strategy effectively enhances higher-order modal scattering absorption, providing insights for nacelle liner design and validation.