AbstractAcoustic imaging is an indispensable experimental aid in the design of silent aircraft. In this work, acoustic imaging is performed in a classical closed-section wind tunnel that has been extensively modified using specifically designed liners on the walls of the test section. The details of the associated acoustic modification and the aeroacoustic imaging method are introduced in this paper. The acoustic test performance is carefully evaluated by examining background noise reductions and acoustic beamforming results. The experimental outcomes suggest that the proposed acoustic modification could suppress background noise by 5 dB at 40–80  m/s test flow speeds. The beamforming results clearly identify the dominant airframe noise sources at landing gears and high-lift devices. The experimental results agree fairly well with the preceding computational and empirical predictions. The proposed acoustic imaging technique has been shown to be an effective experimental technique in identifying airframe noise sources. In addition, the acoustic treatments developed in this paper could be considered in extending the aeroacoustic capabilities of existing closed-section wind tunnels.


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Aeroacoustic Imaging Experiments of Airframe Noise in Lined Wall Closed-Section Wind Tunnel



    Published in:

    Publication date :

    2015




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English



    Classification :

    BKL:    55.50 Luftfahrzeugtechnik / 55.60 Raumfahrttechnik / 51.40 Werkstoffe für bestimmte Anwendungsgebiete
    Local classification TIB:    770/7040



    Aeroacoustic Imaging Experiments of Airframe Noise in Lined Wall Closed-Section Wind Tunnel

    Chen, Bao / Wei, Qingkai / Shao, Tianshuang et al. | ASCE | 2014


    Slat Noise: Aeroacoustic Beamforming in Closed-Section Wind Tunnel with Numerical Comparison

    Pagani, Carlos C. / Souza, Daniel S. / Medeiros, Marcello A. F. | AIAA | 2016




    Aeroacoustic Noise Survey on Supersonic Transport Airframe in Large-Scale Aerodynamic Low-Speed Wind Tunnel

    Ito, T. / Ura, H. / Kajitani, K. et al. | British Library Conference Proceedings | 2008