Tentative explanation of the mechanism of noise reduction for trailing edge with chevron

Abstract eng:
Recently, chevron appears at the trailing edge of commercial aircraft jet engines, for example, jet engine of Boeing 787. It is believed to be for the noise reduction. So far, there is no theoretical explanations for its mechanism in published literatures, though there were papers for this purpose for the serration appeared at the jet exit. In this paper, a simplified model is proposed, to explore the possible cause of the noise reduction by chevron at the trailing edge of commercial aircraft jet engines.

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