Mach number similarity law of high-lift device noise based on large-scale wind tunnel test

被引：0
|
作者：
Song, Yubao [1 ]
Zhang, Rongping [1 ]
Sun, Yifeng [2 ]
Zhang, Junlong [1 ]
Fan, Zhenglei [1 ]
机构：
[1] China Aerodynamics Research and Development Center, Mianyang,621000, China
[2] Shanghai Aircraft Design and Research Institute, Shanghai,200135, China
来源：
Hangkong Xuebao/Acta Aeronautica et Astronautica Sinica | 2024年 / 45卷 / 23期
关键词：
In the aeroacoustic wind tunnel test; a common case is that not all parameters can be simulated some⁃ times(e. g; model size; Mach number and Reynolds number; etc.); Correspondingly; test results transformation is needed to be conducted based on similarity laws. Based on the 5. 5 m×4 m aeroacoustic wind tunnel and the corre⁃ sponding full and half models for the aeroacoustic study of large-scale aircraft; the properties and Mach number simi⁃ larity laws of high-lift device noise were studied experimentally. During the study of similarity laws; correction of fre⁃ quency and amplitude of noise spectrum was considered mainly. For frequency correction; the transformation meth⁃ ods based on Strouhal number and Helmholtz number are compared. On this basis; the amplitude correction param⁃ eters are considered to be of different values in divided frequency ranges; and suggestion for the selection of division frequency is proposed. Further; the uniformity of the two frequency transformation methods is analysed. The results indicate that the composition; mechanism and principles of the high-lift device noise source are different in various fre⁃ quency ranges; and are affected by slat/flap angles; angles of attack of model; wind speeds; test positions/propaga⁃ tion directions; etc. A good similarity is presented for the high-lift device noise on the whole. Based on the similarity transformation method; the noise at different wind speeds is predicted effectively; and the prediction method is well suitable for various model situations and test positions. The slopes of noise spectra are related to sound source com⁃ positions and properties; and the break frequency of the slopes can be selected as the dividing frequency for the fre⁃ quency ranges. For the model states with non-zero angles of attack; when the frequency correction is based on Helm⁃ holtz number; a good prediction result can be obtained with the amplitude correction parameters being set as 5 and 6 in the middle to low frequency range and the middle to high frequency range; respectively. The transformation meth⁃ ods based on Strouhal number and Helmholtz number show inherent unity to some extent. © 2024 Chinese Society of Astronautics. All rights reserved;
D O I：
10.7527/S1000-6893.2024.30389
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