Overview

Calculations of sound radiated from unflanged cylindrical ducts are presented. The numerical simulation models the problem of an aero-engine inlet. The time dependent linearized Euler equations are solved from a state of rest until a harmonic solution is attained. A fourth order accurate finite difference scheme is used and solutions are obtained from a fully vectorized Cyber-203 computer program. Cases of both plane waves and spin modes are treated. Spin modes model the sound generated by a turbofan engine. Boundary conditions for both plane waves and spin modes are treated. Solutions obtained are compared with experiments conducted at NASA Langley Research Center. Hartharan, S. L. and Bayliss, A. Langley Research Center NASA-CR-172171, NAS 1.26:172171 NAS1-17070; DE-AC02-76ER-03077; AF-AFOSR-0020-81

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9781724688910

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