Abstract
High frequency geometrical acoustics based on ray-tracing methods is used to compute the spherical directivity of noise radiated from a convecting quadrupole source. The source is placed at an arbitrary position within a spreading jet. The propagation equations are solved in their general form in a rectangular coordinate system. The directivity pattern for an observer in the far field is obtained by applying an iteration scheme that finds the particular ray that connects the source point to the observer. Factors influencing the zone of silence are discussed. The formation of caustic as a result of reduction in ray tube area and the exact location where it appears is demonstrated. Finally the noise directivity due to a ring source convecting along an axisymmetric jet is obtained by a simple integration on the azimuthal directivity of compact quadrupole sources distributed on the ring.
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© 1993 Springer-Verlag New York, Inc.
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Khavaran, A. (1993). Application of Geometrical Acoustics to Propagation of High Frequency Jet Noise. In: Hardin, J.C., Hussaini, M.Y. (eds) Computational Aeroacoustics. ICASE/NASA LaRC Series. Springer, New York, NY. https://doi.org/10.1007/978-1-4613-8342-0_27
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DOI: https://doi.org/10.1007/978-1-4613-8342-0_27
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