Aeroacoustics research approaches Sound in the far-fieldby phase-microphones array (field tests and large-anechoic wind tunnels) Phenomenological research by Computational aero-acoustics (CAA) - DNS, LES (direct approaches) - DNS+LEE, LES+BEM, RANS+SNGR (hybrid approaches) Surface pressure sensors and acoustic analogies e.g. Pressure transducers and Curle analogy Experimental noise-source identification by PIV statistical techniques (spatio-temporal velocity correlations) time-resolved analysis (velocity or derived pressure spectra) 德國(guó)LaVision PIV/PLIF粒子成像測(cè)速場(chǎng)儀 體視層析粒子成像測(cè)速系統(tǒng)(Tomo-PIV) HighSpeedStar PIV相機(jī)