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Axial Ventilator Tip Gap Noise Prediction from Discontinuous Galerkin based CAA with Stochastic Vortex Sound Sources

Liberson, Lev and Lummer, Markus and Mößner, Michael and Ewert, Roland and Delfs, Jan Werner (2019) Axial Ventilator Tip Gap Noise Prediction from Discontinuous Galerkin based CAA with Stochastic Vortex Sound Sources. In: Proceedings of the 23rd International Congress on Acoustics, integrating 4th EAA Euroregio 2019. 23rd International Congress on Acoustics, 09.-13. Sep. 2019, Aachen, Deutschland.

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Abstract

A prominent noise source of axial ventilators emerges from the complex flow within the tip clearance between fan blades and surrounding encasement. To obtain an aeroacoustic fan design, an associated process must be acceptably efficient while providing a sufficiently amount of physical modeling depth. The mechanisms of noise generation as well as the sound propagation in highly inhomogeneous flow fields have to be captured. A promising method is developed at the DLR by using the in-house CAA propagation solver DISCO++ coupled with the stochastic acoustic source generator Fast Rand Particle Mesh Method (FRPM). Utilizing the Discontinuous Galerkin method the Acoustic Perturbation Equations (APE) are solved on an unstructured tetrahedral mesh, while the acoustic sources are reconstructed on a Cartesian background grid. The prediction capability of the method is evaluated by computing the noise generated by a ducted axial ventilator at two different tip clearance variations. While the trailing edge noise is well captured, the tip gap noise increase is not properly predicted in terms of spectral shape – presumably due to anisotropic length scale influence not properly recognized by the current stochastic model. First simulations based on an enhanced anisotropic length scale model will be presented and results discussed.

Item URL in elib:https://elib.dlr.de/129389/
Document Type:Conference or Workshop Item (Speech)
Title:Axial Ventilator Tip Gap Noise Prediction from Discontinuous Galerkin based CAA with Stochastic Vortex Sound Sources
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Liberson, LevLev.Liberson (at) dlr.deUNSPECIFIED
Lummer, MarkusMarkus.Lummer (at) dlr.deUNSPECIFIED
Mößner, MichaelMichael.Moessner (at) dlr.deUNSPECIFIED
Ewert, RolandRoland.Ewert (at) dlr.deUNSPECIFIED
Delfs, Jan WernerJan.Delfs (at) dlr.deUNSPECIFIED
Date:September 2019
Journal or Publication Title:Proceedings of the 23rd International Congress on Acoustics, integrating 4th EAA Euroregio 2019
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Accepted
Keywords:Simulation, Computational Fluid Dynamics, Numerical Aeroacoustics, Synthetic Turbulence, Hybrid CAA Methods, Acoustic Perturbation Equations, Stochastic Turbulence Reconstruction, HVAC Systems, Axial Ventilator, Discontinuous Galerkin Method, Tip Gap Noise
Event Title:23rd International Congress on Acoustics
Event Location:Aachen, Deutschland
Event Type:international Conference
Event Dates:09.-13. Sep. 2019
Organizer:Deutsche Gesellschaft für Akustik DEGA e.V.
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation and Validation
Location: Braunschweig
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Technical Acoustics
Deposited By: Liberson, Lev
Deposited On:29 Oct 2019 13:14
Last Modified:29 Oct 2019 13:14

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