关键词: 噪声, 桨扇, 飞机噪声, 航空声学

Abstract: The helicoidal surface theory developed by Hanson is an effective method for the prediction of near-field harmonic noise generated by prop-fan. In the original form of harmonic noise equations, the infinite integration over wave number is very complicated. A calculation method, in which the integration over wave number is done via a fast Fourier Transform, is presented in this paper. With this method, the near-field harmonic noise at constant distance from the prop-fan axis can be quickly calculated as a transformed array. This paper gives a minute description of FFT method. The actual application lo prop-fan shows that the method presented in this paper is suitable to predict and analyse the noise field of prop-fan, and the results are in agreement with the flight testing results.

Key words: noise, prop-fan, aircraft noise, aeroacoustics