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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 1993, Vol. 14 ›› Issue (6): 254-262.

• 论文 • Previous Articles     Next Articles

A NUMERICAL PREDICTION METHOD FOR THE NEAR-FIELD HARMONIC NOISE OF PROP-FAN

Qiao Wei-yang (Faculty 703, Northwestern Polytechnical University, Xi'an, 710072   

  1. Faculty 703, Northwestern Polytechnical University, Xi'an, 710072
  • Received:1991-12-30 Revised:1992-07-14 Online:1993-06-25 Published:1993-06-25

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