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
[2] Shanghai Aircraft Design and Research Institute, Shanghai
来源：
Hangkong Xuebao/Acta Aeronautica et Astronautica Sinica | 2024年 / 45卷 / 23期
关键词：
aerodynamic noise; amplitude correction; frequency correction; high-lift device; similarity law; wind tunnel test;
D O I：
10.7527/S1000-6893.2024.30389
中图分类号：
学科分类号：
摘要：
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.
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