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Numerical study on the sound amplification of a T-junction with bias flow
KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, MWL Marcus Wallenberg Laboratoriet.
KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, MWL Marcus Wallenberg Laboratoriet.
KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, MWL Marcus Wallenberg Laboratoriet.ORCID-id: 0000-0001-7898-8643
2016 (engelsk)Inngår i: Springer Proceedings in Physics, 2016, s. 373-381Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

This paper reports a numerical study on the aeroacoustic response of a rectangular T-junction with bias flow in the side-branch. The primary motivation of the present work is to study and explain the in recent experiments observed high sound amplification at small bias flows. The study is conducted by performing numerical simulation, which solves the 2D compressible linearized Navier-Stokes equations (LNSEs) in the frequency domain. The time averaged flow is first solved by using RANS along with a k-ε turbulence model. The overall agreement with the experimental acoustic 3-port scattering data is good. It is found that the base flow changes significantly with the presence of a small bias flow. Compared to the case with no bias flow, a strong shear layer is created along the downstream main duct by the mixed grazing-bias flow. For small bias flows (Mach-number < 0.02) this shear layers extends far downstream of the actual junction. This creates a region of vortex-sound interaction much larger than for the no bias flow case, which is the main explanation behind the large amplification. © Springer International Publishing Switzerland 2016.

sted, utgiver, år, opplag, sider
2016. s. 373-381
Emneord [en]
Aerodynamics, Amplification, Frequency domain analysis, Intersections, Navier Stokes equations, Turbulence models, Wakes, Aeroacoustic response, Frequency domains, K-epsilon turbulence model, Linearized navier-stokes equations, Scattering data, Sound amplification, Time-averaged flow, Vortex-sound interactions, Shear flow
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-194581DOI: 10.1007/978-3-319-30602-5_47ISI: 000387431400047Scopus ID: 2-s2.0-84979026664ISBN: 9783319306001 (tryckt)OAI: oai:DiVA.org:kth-194581DiVA, id: diva2:1044186
Konferanse
5th International Conference on Jets, Wakes and Separated Flows, ICJWSF2015, 15 June 2015 through 18 June 2015
Merknad

Correspondence Address: Du, L.; The Marcus Wallenberg Laboratory for Sound and Vibration Research, KTH-CCGEx, KTH-FLOWSweden; email: ldu@kth.se. QC 20161102

Tilgjengelig fra: 2016-11-02 Laget: 2016-10-31 Sist oppdatert: 2016-12-22bibliografisk kontrollert

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