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

  • Yubao SONG ,
  • Rongping ZHANG ,
  • Yifeng SUN ,
  • Junlong ZHANG ,
  • Zhenglei FAN
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  • 1.China Aerodynamics Research and Development Center,Mianyang 621000,China
    2.Shanghai Aircraft Design and Research Institute,Shanghai 200135,China

Received date: 2024-03-14

  Revised date: 2024-04-03

  Accepted date: 2024-05-17

  Online published: 2024-06-17

Supported by

Project of Experimental Technology Research(1800120177)

Abstract

In the aeroacoustic wind tunnel test, a common case is that not all parameters can be simulated sometimes (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 corresponding full and half models for the aeroacoustic study of large-scale aircraft, the properties and Mach number similarity laws of high-lift device noise were studied experimentally. During the study of similarity laws, correction of frequency and amplitude of noise spectrum was considered mainly. For frequency correction, the transformation methods based on Strouhal number and Helmholtz number are compared. On this basis, the amplitude correction parameters 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 frequency ranges, and are affected by slat/flap angles, angles of attack of model, wind speeds, test positions/propagation 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 compositions and properties, and the break frequency of the slopes can be selected as the dividing frequency for the frequency ranges. For the model states with non-zero angles of attack, when the frequency correction is based on Helmholtz 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 methods based on Strouhal number and Helmholtz number show inherent unity to some extent.

Cite this article

Yubao SONG , Rongping ZHANG , Yifeng SUN , Junlong ZHANG , Zhenglei FAN . Mach number similarity law of high-lift device noise based on large-scale wind tunnel test[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2024 , 45(23) : 630389 -630389 . DOI: 10.7527/S1000-6893.2024.30389

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