Validation of a Jet–Surface Interaction Noise Model in Flight

Abstract

Several methods for calculating jet–surface interaction noise have been developed recently and validated against laboratory measurements. However, further validation cases are required that include the effect of a flight stream. This Paper assesses the ability of the method of Lyu and Dowling to predict the effect of forward flight on jet–surface interaction noise produced by a laboratory jet. The main inputs to the method are near-field pressure measurements of the isolated jet, recorded within the flight-stream flow using a microphone with a nose cone. The predicted jet–surface interaction noise is then compared with measured far-field installed jet noise spectra over polar angles from 70 to 130 deg on the unshielded side of the jet. The results show that the model is capable of accurately reproducing both the amplitude and spectral shape of the jet–surface interaction noise up to a flight-stream Mach number of 0.2.