Noise Reduction Mechanism and Spectral Scaling of Slat Gap Filler Device at Low Angle of Attack
Slat noise poses a significant challenge during aircraft landing. Slat gap filler (SGF) technology has shown promise in mitigating slat noise, yet its noise reduction mechanisms and characteristics remain unclear. This study numerically investigates the noise reduction mechanisms of SGF and analyzes...
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MDPI AG
2025-06-01
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| Series: | Aerospace |
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| Online Access: | https://www.mdpi.com/2226-4310/12/6/541 |
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| author | Yingzhe Zhang Peiqing Liu Baohong Bai |
| author_facet | Yingzhe Zhang Peiqing Liu Baohong Bai |
| author_sort | Yingzhe Zhang |
| collection | DOAJ |
| description | Slat noise poses a significant challenge during aircraft landing. Slat gap filler (SGF) technology has shown promise in mitigating slat noise, yet its noise reduction mechanisms and characteristics remain unclear. This study numerically investigates the noise reduction mechanisms of SGF and analyzes its noise characteristics using the high-lift common research model (CRM-HL). The lattice Boltzmann solver simulates the unsteady flow field, and the Ffowcs-Williams and Hawkings (FW-H) equation predicts far-field noise. The computed results exhibit a satisfactory concordance with experimental measurements. Furthermore, the near-field flow dynamics have been elucidated through proper orthogonal decomposition. The findings demonstrate that the SGF alters the distribution patterns of flow dynamics and pressure fluctuations, thereby effectively attenuating the mode energy. Moreover, our findings demonstrate that SGF significantly reduces slat noise. The noise reduction mechanism can be attributed to decreased surface pressure fluctuations on the leading edge of the main wing, and a shifted broadband noise peak to a lower frequency due to the enlarged slat cove flow vortex caused by SGF. Finally, a scaling analysis of the slat noise spectra indicates that the SGF noise spectra align well with baseline slat noise spectra when the characteristic length scale is determined by the vortex structure. |
| format | Article |
| id | doaj-art-c08f517c6c9246c6830328076a44231e |
| institution | Kabale University |
| issn | 2226-4310 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | MDPI AG |
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| series | Aerospace |
| spelling | doaj-art-c08f517c6c9246c6830328076a44231e2025-08-20T03:24:26ZengMDPI AGAerospace2226-43102025-06-0112654110.3390/aerospace12060541Noise Reduction Mechanism and Spectral Scaling of Slat Gap Filler Device at Low Angle of AttackYingzhe Zhang0Peiqing Liu1Baohong Bai2School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, ChinaSchool of Aeronautic Science and Engineering, Beihang University, Beijing 100191, ChinaBeijing Aircraft Technology Research Institute of Commercial Aircraft Corporation of China, Ltd., Beijing 102211, ChinaSlat noise poses a significant challenge during aircraft landing. Slat gap filler (SGF) technology has shown promise in mitigating slat noise, yet its noise reduction mechanisms and characteristics remain unclear. This study numerically investigates the noise reduction mechanisms of SGF and analyzes its noise characteristics using the high-lift common research model (CRM-HL). The lattice Boltzmann solver simulates the unsteady flow field, and the Ffowcs-Williams and Hawkings (FW-H) equation predicts far-field noise. The computed results exhibit a satisfactory concordance with experimental measurements. Furthermore, the near-field flow dynamics have been elucidated through proper orthogonal decomposition. The findings demonstrate that the SGF alters the distribution patterns of flow dynamics and pressure fluctuations, thereby effectively attenuating the mode energy. Moreover, our findings demonstrate that SGF significantly reduces slat noise. The noise reduction mechanism can be attributed to decreased surface pressure fluctuations on the leading edge of the main wing, and a shifted broadband noise peak to a lower frequency due to the enlarged slat cove flow vortex caused by SGF. Finally, a scaling analysis of the slat noise spectra indicates that the SGF noise spectra align well with baseline slat noise spectra when the characteristic length scale is determined by the vortex structure.https://www.mdpi.com/2226-4310/12/6/541aeroacousticsairframe noisehigh-lift deviceslat noiseslat gap filler |
| spellingShingle | Yingzhe Zhang Peiqing Liu Baohong Bai Noise Reduction Mechanism and Spectral Scaling of Slat Gap Filler Device at Low Angle of Attack Aerospace aeroacoustics airframe noise high-lift device slat noise slat gap filler |
| title | Noise Reduction Mechanism and Spectral Scaling of Slat Gap Filler Device at Low Angle of Attack |
| title_full | Noise Reduction Mechanism and Spectral Scaling of Slat Gap Filler Device at Low Angle of Attack |
| title_fullStr | Noise Reduction Mechanism and Spectral Scaling of Slat Gap Filler Device at Low Angle of Attack |
| title_full_unstemmed | Noise Reduction Mechanism and Spectral Scaling of Slat Gap Filler Device at Low Angle of Attack |
| title_short | Noise Reduction Mechanism and Spectral Scaling of Slat Gap Filler Device at Low Angle of Attack |
| title_sort | noise reduction mechanism and spectral scaling of slat gap filler device at low angle of attack |
| topic | aeroacoustics airframe noise high-lift device slat noise slat gap filler |
| url | https://www.mdpi.com/2226-4310/12/6/541 |
| work_keys_str_mv | AT yingzhezhang noisereductionmechanismandspectralscalingofslatgapfillerdeviceatlowangleofattack AT peiqingliu noisereductionmechanismandspectralscalingofslatgapfillerdeviceatlowangleofattack AT baohongbai noisereductionmechanismandspectralscalingofslatgapfillerdeviceatlowangleofattack |