Numerical Investigation of the Noise Emission from Serrated Nozzles in Coaxial Jets

Ł. Panek (), J. Yan, D. Eschricht and F. Thiele
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Ł. Panek: Technische Universität Berlin, Institut für Strömungsmechanik und Technische Akustik

A chapter in High Performance Computing in Science and Engineering, Garching/Munich 2007, 2009, pp 325-334 from Springer

Abstract: Abstract Jet noise remains an important source of aircraft noise, especially at take-off. The reduction of jet noise due to the application of serrated exit nozzles in aero-engines is one of the subjects under investigation within the German research project FREQUENZ. It can be shown that the generation of additional vorticity at the nozzle exit by modifications of the exit geometry, such as serrations, influences the radiated noise spectrum giving rise to a lower acoustic emission in certain frequency ranges. However, the mechanisms behind this phenomenon are not yet well understood. Numerical simulation of the flow field allows an in-depth analysis of the flow phenomena involved and the mechanisms of noise generation. In this work, simulation results for high subsonic coaxial jet flows are presented for a typical jet-engine exhaust. The geometry has been studied with a plane nozzle and with passive flow control (serrated) on the nozzle lip. They are investigated using far-field sound characteristics obtained by the Ffowcs-Williams-Hawkings acoustic analogy and compared to experimental measurements.

Date: 2009
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Persistent link: https://EconPapers.repec.org/RePEc:spr:sprchp:978-3-540-69182-2_26

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DOI: 10.1007/978-3-540-69182-2_26

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