Investigation of aeroacoustic localization technique in lining test section

To meet the requirement of aeroacoustic localization experiment for civil aircrafts like C919 and MA700 in aero-acoustic wind tunnel tests,a liner test section featuring phased ar-ray beamforming algorithm and diagonal removal deconvolution was adopted to deal with the high background noise and flow interference to microphones in the closed test section.MA60 model test was carried out for validation.Test results show that the acoustic liner is in favour of micro-phone phased array and line array installation in the closed test section,and the background noise is reduced to be about 5 ~10dB which is lower than that in traditional closed test sections.The sound pressure level and trend found in the localization tests are reasonable.Judging from the re-sults,FL9 is capable of locating source and taking aeroacoustic experiments of airframe source lo-calization,noise reduction technique validation in the development of civil aircrafts.