Results achieved with three acoustic liner configurations are used to evaluate the effects of recent modifications to the NASA Normal Incidence Tube and Grazing Flow Impedance Tube. These include a calibration liner, a wire mesh liner, and a perforate liner. The effects of source type, source level, and mean flow Mach number on the impedances educed with these liners are explored. Existing models are used to predict the impedance for each test condition and are compared with educed impedance spectra to determine their validity. The results suggest that educed impedances are similar for either a stepped sine or swept sine source. The predicted models are acceptable for the perforate liner and are quite good for the calibration and wire mesh liners.


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    Benchmark Data for Evaluation of NASA Impedance Eduction Methods


    Contributors:
    M G Jones (author) / B M Howerton (author)

    Conference:

    2021 AIAA AVIATION Forum ; 2021 ; Virtual, US


    Type of media :

    Conference paper


    Type of material :

    No indication


    Language :

    English





    BENCHMARK DATA FOR EVALUATION OF NASA IMPEDANCE EDUCTION METHODS

    Jones, Michael G. / Howerton, Brian M. | TIBKAT | 2021


    Benchmark Data for Evaluation of NASA Impedance Eduction Methods

    Jones, Michael G. / Howerton, Brian M. | AIAA | 2021


    ONERA-NASA cooperative effort on liner impedance eduction

    Primus, Julien / Piot, Estelle / Simon, Frank et al. | AIAA | 2013


    Comparative Study of Impedance Eduction Methods, Part 2: NASA Tests and Methodology

    Jones, Michael G. / Watson, Willie R. / Howerton, Brian M. et al. | AIAA | 2013