Design of a facility for studying shock-cell noise on single and coaxial jets

Daniel Guariglia, Alejandro Rubio Carpio, Christophe Schram

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)
34 Downloads (Pure)

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.

Original languageEnglish
Article number25
Number of pages29
JournalAerospace — Open Access Aeronautics and Astronautics Journal
Volume5
Issue number1
DOIs
Publication statusPublished - 2018

Keywords

  • Aeroacoustics
  • Coaxial jet
  • COMSOL Multiphysics
  • Dual stream jet
  • Facility design
  • PIV
  • Screech
  • Shock-cell noise
  • Supersonic jet noise

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