TY - JOUR
T1 - Combustion noise prediction using linearized navier-stokes equations and large-eddy simulation sources
AU - Ullrich, Wolfram Christoph
AU - Hirsch, Christoph
AU - Sattelmayer, Thomas
AU - Lackhove, Kilian
AU - Sadiki, Amsini
AU - Fischer, André
AU - Staufer, Max
N1 - Publisher Copyright:
© Copyright 2017 by Wolfram Ullrich, Kilian Lackhove, André Fischer, Christoph Hirsch, Thomas Sattelmayer, Amsini Sadiki, and Max Staufer.
PY - 2018/1
Y1 - 2018/1
N2 - In modern aeroengines, combustion noise has become a significant source to the overall noise, particularly at approach conditions. This requires further advances in understanding and predicting combustion noise of turbulent flames. This is the aim of the present study, where a hybrid computational fluid dynamics/computational aeroacoustics approach is applied on a generic premixed and pressurized combustor to assess its accuracy for combustion noise predictions. The hybrid approach consists of Reynolds-averaged Navier-Stokes (RANS) or largeeddy simulations (LES) mean flow and frequency-domain simulations based on linearized Navier-Stokes equations that are fed by combustion noise source terms. The latter are obtained from both the application of a statistical noise model on the RANS simulations and a postprocessing of incompressible LES, in a first step. The acoustic simulation results are compared with experimental pressure measurements conducted by the Centre National de la Recherche Scientifique. Very good agreement is found over the entire frequency range if the LES source model is applied. Sensitivity studies with respect to feeding lines, mean flowfield, and mesh were performed. The resulting comparisons of the linearized Navier-Stokes equation simulations based on the RANS and LES flowfields revealed that the combustion noise spectrum is mainly governed by the heat release spectrum but not by the aerodynamic combustor flowfield. However, this issue needs further investigation.
AB - In modern aeroengines, combustion noise has become a significant source to the overall noise, particularly at approach conditions. This requires further advances in understanding and predicting combustion noise of turbulent flames. This is the aim of the present study, where a hybrid computational fluid dynamics/computational aeroacoustics approach is applied on a generic premixed and pressurized combustor to assess its accuracy for combustion noise predictions. The hybrid approach consists of Reynolds-averaged Navier-Stokes (RANS) or largeeddy simulations (LES) mean flow and frequency-domain simulations based on linearized Navier-Stokes equations that are fed by combustion noise source terms. The latter are obtained from both the application of a statistical noise model on the RANS simulations and a postprocessing of incompressible LES, in a first step. The acoustic simulation results are compared with experimental pressure measurements conducted by the Centre National de la Recherche Scientifique. Very good agreement is found over the entire frequency range if the LES source model is applied. Sensitivity studies with respect to feeding lines, mean flowfield, and mesh were performed. The resulting comparisons of the linearized Navier-Stokes equation simulations based on the RANS and LES flowfields revealed that the combustion noise spectrum is mainly governed by the heat release spectrum but not by the aerodynamic combustor flowfield. However, this issue needs further investigation.
UR - http://www.scopus.com/inward/record.url?scp=85038208577&partnerID=8YFLogxK
U2 - 10.2514/1.B36428
DO - 10.2514/1.B36428
M3 - Article
AN - SCOPUS:85038208577
SN - 0748-4658
VL - 34
SP - 198
EP - 212
JO - Journal of Propulsion and Power
JF - Journal of Propulsion and Power
IS - 1
ER -