Trailing edge noise measurement: assumptions and uncertainties

This study aims to investigate the assumptions used in analytical models for the prediction of trailing edge noise and uncertainties involved in the measurement of near-field flow parameters, such as surface pressure spectra, convection velocity and spanwise length scale. The comparison and accuracy analysis of several aerofoil trailing edge noise models is performed. The study investigates the models developed by Amiet, Parchen (TNO) and Brooks-Pope-Marcolini (BPM). To provide the input variables for the different models, a flat plate has been manufactured on which the surface pressure fluctuations are measured using an array of flush mounted microphones and the boundary layer properties are found using hot-wire probes. It was found that the input properties of the investigated trailing edge noise prediction models showed strong dependency on the trailing edge condition and that the far-field noise predictions can be significantly affected by these changes.