| Citation: | Ji Jiayuan, Chen Jun, Xu Kangle, et al. Influence of rotational speed on noise reduction effect of nacelle acoustic liners and optimization directions[J]. Journal of Aerospace Power, 2026, 41（X）：20250600 doi: 10.13224/j.cnki.jasp.20250600
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Noise reduction tests of acoustic liners for a short nacelle inlet with a large bypass ratio were conducted on a scaled fan test rig. A sudden drop in noise reduction performance at certain frequencies was observed as rotational speed increased, and the underlying cause was analyzed. This led to the proposal of subsequent optimization directions for acoustic liner design. The study revealed that the noise reduction at twice the blade passing frequency (BPF) of the test liner experienced a sharp decline when the rotational speed increased from 88% to 91%. Modal decomposition analysis indicated that the primary mode associated with twice the BPF scattered into adjacent circumferential dominant modes at higher rotational speeds. By calculating the noise reduction differences of the circumferential modes 35, 36, and 37 across various frequencies, simulation results showed that the noise reduction performance of the 36th circumferential mode decreased at higher frequencies. This implied that as rotational speed increased, the twice the BPF frequency shifted beyond the originally optimized frequency range of the 36th circumferential mode, leading to reduced noise attenuation. In conclusion, the study suggests that in the initial design phase, acoustic liners should not only target the design operating conditions but also comprehensively consider the entire engine operating envelope, with enhanced robustness in noise reduction performance across a wider range of rotational speeds.
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