ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Experimental and prediction research on jet noise for separated exhaust nozzle
Received date: 2015-04-07
Revised date: 2015-09-16
Online published: 2015-10-16
Supported by
National Basic Research Program of China(2012CB720201)
In order to reveal the distribution of frequency spectrum and directivity for the separated exhaust nozzle, prediction and experiment are conducted for scaled mode, then full-scale nozzle model of basic and chevron are calculated. The result shows that Tam & Auriault's jet noise prediction theory is used to predict the noise spectra and direction of far-field noise, and jet noise possesses obvious direction. Compared with basic nozzle, the reduced effect of jet noise with chevron is better. Chevrons are fixed only in primary nozzles which have worse ability of low-frequency noise reduction and the high-frequency noise increase by contrast with chevrons which are fixed in primary and bypass nozzles. The overall sound pressure level (OASPL) value of chevrons which are fixed only in primary nozzles is less than that of chevrons fixed in primary and bypass nozzles at the angle of directivity smaller than 88° in this paper.
WU Fei , SHAO Wanren , HE Jingyu , LI Xiaodong , WANG Deyou . Experimental and prediction research on jet noise for separated exhaust nozzle[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016 , 37(6) : 1790 -1797 . DOI: 10.7527/S1000-6893.2015.0257
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