Direct Numerical Simulation of a Serrated Nozzle End for Jet-Noise Reduction

A. Babucke, M. Kloker and U. Rist
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A. Babucke: Universität Stuttgart, Institut für Aerodynamik und Gasdynamik
M. Kloker: Universität Stuttgart, Institut für Aerodynamik und Gasdynamik
U. Rist: Universität Stuttgart, Institut für Aerodynamik und Gasdynamik

A chapter in High Performance Computing in Science and Engineering `07, 2008, pp 319-337 from Springer

Abstract: Abstract Sound generation of a subsonic laminar jet has been investigated using direct numerical simulation (DNS). The simulation includes the nozzle end, modelled by a finite flat splitter plate with Mach numbers of MaI = 0.8 above and MaII = 0.2 below the plate. Behind the nozzle end, a combination of wake and mixing layer develops. Due to its instability, roll up and pairing of spanwise vortices occur, with the vortex pairing being the major acoustic source. As a first approach for noise reduction, a rectangular notch at the trailing edge is investigated. It generates longitudinal vortices and a spanwise deformation of the flow downstream of the nozzle end. This leads to a an early breakdown of the large spanwise vortices and accumulations of small-scale structures. Compared to a two-dimensional simulation performed earlier [3], the emitted sound is reduced by 6 dB.

Keywords: Direct Numerical Simulation; Vortex Pairing; Streamwise Vortex; Splitter Plate; Linear Stability Theory (search for similar items in EconPapers)
Date: 2008
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Persistent link: https://EconPapers.repec.org/RePEc:spr:sprchp:978-3-540-74739-0_22

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DOI: 10.1007/978-3-540-74739-0_22

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