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Aerospace 2018, 5(1), 25; https://doi.org/10.3390/aerospace5010025

Design of a Facility for Studying Shock-Cell Noise on Single and Coaxial Jets

1
Aeronautics and Aerospace Department, von Karman Institute for Fluid Dynamics, Chaussée de Waterloo 72, 1640 Rhode-Saint-Genèse, Belgium
2
Faculty of Aerospace Engineering, Delft University of Technology, Building 62, Kluyverweg 1, 2629 HS Delft, The Netherlands
*
Author to whom correspondence should be addressed.
Received: 12 January 2018 / Revised: 24 February 2018 / Accepted: 25 February 2018 / Published: 1 March 2018
(This article belongs to the Special Issue Under-Expanded Jets)

Abstract

Shock-cell noise occurs in aero-engines when the nozzle exhaust is supersonic and shock-cells are present in the jet. In commercial turbofan engines, at cruise, the secondary flow is often supersonic underexpanded, with the formation of annular shock-cells in the jet and consequent onset of shock-cell noise. This paper aims at describing the design process of the new facility FAST (Free jet AeroacouSTic laboratory) at the von Karman Institute, aimed at the investigation of the shock-cell noise phenomenon on a dual stream jet. The rig consists of a coaxial open jet, with supersonic capability for both the primary and secondary flow. A coaxial silencer was designed to suppress the spurious noise coming from the feeding lines. Computational fluid dynamics (CFD) simulations of the coaxial jet and acoustic simulations of the silencer have been carried out to support the design choices. Finally, the rig has been validated by performing experimental measurements on a supersonic single stream jet and comparing the results with the literature. Fine-scale PIV (Particle Image Velocimetry) coupled with a microphone array in the far field have been used in this scope. Preliminary results of the dual stream jet are also shown. View Full-Text
Keywords: facility design; coaxial jet; dual stream jet; aeroacoustics; supersonic jet noise; shock-cell noise; screech; PIV; COMSOL Multiphysics facility design; coaxial jet; dual stream jet; aeroacoustics; supersonic jet noise; shock-cell noise; screech; PIV; COMSOL Multiphysics
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Guariglia, D.; Rubio Carpio, A.; Schram, C. Design of a Facility for Studying Shock-Cell Noise on Single and Coaxial Jets. Aerospace 2018, 5, 25.

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