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- W2034265375 abstract "A previously reported closed form solution is expanded to determine effects of isentropic mean flow on mode propagation in a slowly converging-diverging duct - a circular cosh duct. On the assumption of uniform steady fluid density, the mean flow increases the power transmission coefficient. The increase is directly related to the increase of the cutoff ratio at the duct throat. With the negligible transverse gradients of the steady fluid variables, the conversion from one mode to another is negligible, and the power transmission coefficient remains unchanged with the mean flow direction reversed. With a proper choice of frequency parameter, many different modes can be made subject to a single value of the power transmission loss. The paper also describes a systematic method to include the effects of the gradients of the steady fluid variables." @default.
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- W2034265375 date "1983-07-01" @default.
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- W2034265375 title "Mode propagation in nonuniform circular ducts with potential flow" @default.
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- W2034265375 doi "https://doi.org/10.2514/3.8185" @default.
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