Virginia Tech. Engineering Science and Mechanics DepartmentNayfeh, Ali H.Kelly, Jeffrey J.Watson, Layne T.2015-05-282015-05-281982-04-01Nayfeh, A. H., Kelly, J. J., & Watson, L. T. (1982). Propagation of spinning acoustic modes in partially choked converging ducts. Journal of the Acoustical Society of America, 71(4), 796-802. doi: 10.1121/1.3876050001-4966http://hdl.handle.net/10919/52712A computer model based on the wave-envelope technique is used to study the propagation of spinning acoustic modes in converging hard-walled and lined circular ducts carrying near sonic mean flows. The results show that with increasing spinning mode number the intensification of the acoustic signal at the throat decreases for upstream propagation. The influence of the throat Mach number, frequency, boundary-layer thickness, and liner admittance on the propagation of spinning modes is considered. 1982 Acoustical Society of America7 pagesapplication/pdfen-USIn CopyrightAcoustic modelingAcoustic signal processingComputer modelingDuct flowsMach numbersPropagation of spinning acoustic modes in partially choked converging ductsArticle - Refereedhttp://scitation.aip.org/content/asa/journal/jasa/71/4/10.1121/1.387605Journal of the Acoustical Society of Americahttps://doi.org/10.1121/1.387605