TY - JOUR
T1 - Design of a facility for studying shock-cell noise on single and coaxial jets
AU - Guariglia, Daniel
AU - Carpio, Alejandro Rubio
AU - Schram, Christophe
PY - 2018
Y1 - 2018
N2 - 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.
AB - 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.
KW - Aeroacoustics
KW - Coaxial jet
KW - COMSOL Multiphysics
KW - Dual stream jet
KW - Facility design
KW - PIV
KW - Screech
KW - Shock-cell noise
KW - Supersonic jet noise
UR - http://resolver.tudelft.nl/uuid:65e7bc5a-6aaf-4d91-bb58-cb5857196d7a
UR - http://www.scopus.com/inward/record.url?scp=85042631331&partnerID=8YFLogxK
U2 - 10.3390/aerospace5010025
DO - 10.3390/aerospace5010025
M3 - Article
AN - SCOPUS:85042631331
SN - 2226-4310
VL - 5
JO - Aerospace — Open Access Aeronautics and Astronautics Journal
JF - Aerospace — Open Access Aeronautics and Astronautics Journal
IS - 1
M1 - 25
ER -