Identification of the two-sources at the aircraft slat/fuselage juncture based on phased array

Baohong Bai; Yingzhe Zhang; Xiaodong Li

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Identification of the two-sources at the aircraft slat/fuselage juncture based on phased array

机译：Identification of the two-sources at the aircraft slat/fuselage juncture based on phased array

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摘要

Slat/fuselage juncture noise or slat horn noise has been identified as a major airframe noise component and is commonly assumed to be similar to the flap side-edge noise. However, whether the slat/fuselage juncture noise has similar characteristics to flap side-edge noise has not been confirmed. In this study, the slat/fuselage juncture noise sources in realistic aircraft configurations are investigated based on phased microphone arrays. Two different source mapping methods of L_(1/2)-DAMAS and CLEAN-SC are applied to the airframe noise benchmark test DLR1 for cross validation. It is shown that both methods obtained identical noise characteristics and source strength distributions. The slat/fuselage juncture noise is revealed to be completely different from the flap side-edge noise. The spectrum of the slat/fuselage juncture noise is Helmholtz-dependent, rather than Strouhal-dependent, as the flow Mach number increases. The broad peak of the spectrum shifts towards a higher frequency as the angle of attack increases. Furthermore, both the two source mapping methods all identified two noise sources existing at the aircraft slat/fuselage juncture. The first noise source is the inboard slat side-edge vortex scattering and the second noise source is the horseshoe vortex on the fuselage. It is demonstrated that the side-edge vortex scattering dominates the spectrum, especially in the middle- and high-frequency domains. The horseshoe vortex is a major noise contributor in the low-frequency domain. These findings provide improved insight into the underlying noise generation mechanisms and can help develop prediction methods for slat/fuselage juncture flow noise.

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来源
《Aerospace science and technology》 |2023年第4期|108186.1-108186.14|共14页
作者
Baohong Bai; Yingzhe Zhang; Xiaodong Li;
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作者单位

Department of Aerodynamics and Aeroacoustics, Beijing Aircraft Technology Research Institute of Commercial Aircraft Corporation of China, Ltd., Beijing, China, Beijing Key Laboratory of Simulation Technology for Civil Aircraft Design, Beijing, China;

School of Energy and Power Engineering, Beihang University, Beijing, China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种英语
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关键词
Aeroacoustics; Airframe noise; High-lift device; Slat noise; Slat/fuselage juncture;

Identification of the two-sources at the aircraft slat/fuselage juncture based on phased array

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