Source Term Evaluation of the APE-RF System

Bui, Phong Nhu; Schröder, Wolfgang; Meinke, Matthias

doi:10.2514/6.2006-2678

Cited by 7 publications

(5 citation statements)

References 14 publications

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“…This has already been done in a hybrid DNS/APE-RF method 11 for a very small reaction zone. However, in the current work, this analysis is performed for a full size non-premixed flame.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Combustion Noise and Sound Source Mechanisms in a Non-Premixed Flame Using LES and APE-RF

Bui

Ihme

Meinke

et al. 2007

13th AIAA/CEAS Aeroacoustics Conference (28th AIAA Aeroacoustics Conference)

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In this study, combustion noise and sound source mechanisms of an unconfined turbulent non-premixed flame, i.e., the DLR-A flame is investigated. A hybrid LES/CAA approach is thereby employed in which a low Mach number variable density large-eddy simulation (LES) is combined with the acoustic perturbation equations for reacting flows (APE-RF). In the first step of the hybrid analysis the flamelet/progress variable (FPV) model is employed as combustion model followed by the acoustic simulation in the second step using the acoustic perturbation equations for reacting flows (APE-RF). In the acoustic analysis, special emphasis is placed on the impact of the thermoacoustic source contributions within the pressure-density relation of the APE-RF system on the radiated acoustic field and the applicability of these source formulations in terms of a hybrid CFD/CAA approach. The flamelet/progress variable database has been extended in terms of acoustic source terms. The unsteady heat release rate, the source describing the effect of non-isomolar combustion, and the species diffusion term are described by two independent parameters, i.e., the mixture fraction and the progress variable. From the findings in the present study, the analysis of the acoustic field of low Mach number reacting flows induced by the thermoacoustic sources such as the unsteady heat release leads to a very stiff problem formulation, since the related sources require highly resolved regions in the source area, which restricts the possible time step during temporal integration of the equations. The numerical bottleneck is not so restrictive when a source term formulation based on the density distribution is used. Spectra obtained from the simulated acoustic field, using two different source term formulations involving derivatives of the density are in good agreement with the experimental data even in the higher frequency range.

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“…This has already been done in a hybrid DNS/APE-RF method 11 for a very small reaction zone. However, in the current work, this analysis is performed for a full size non-premixed flame.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Combustion Noise and Sound Source Mechanisms in a Non-Premixed Flame Using LES and APE-RF

Bui

Ihme

Meinke

et al. 2007

13th AIAA/CEAS Aeroacoustics Conference (28th AIAA Aeroacoustics Conference)

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“…Since the source of the modified continuity equation q c is also expressed via the time derivative like the source of the pressure-density relation q e in Eq. (19) the filter zone can also be applied to q c . To show the impact of the filter zone, a convection of an iso-thermal density distribution with a non-dimensional mean flow of u ¼ ð0:1; 0Þ T is simulated, which can be considered as a convecting entropy spot.…”

Section: Cfd/caa Interface Conditionmentioning

confidence: 99%

“…The APE-RF system, which has been introduced in [19] can be summarized as follows. Rearranging the conservation equations of mass and momentum for a multicomponent fluid, introducing the energy equation for multicomponent reacting flows, and subtracting the averaged equations, respectively, such that the left-hand side of the original APE system [17] is maintained, the equations read…”

Section: Acoustic Perturbation Equations For Reacting Flowsmentioning

confidence: 99%

Numerical analysis of the acoustic field of reacting flows via acoustic perturbation equations

2008

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“…It could be considered by an incompressible LES or unsteady RANS simulation, which provides the relevant perturbation sources. This classical CFD simulation can only cover the incompressible lowMach number flowinside the combustion chamber.T he acoustic wave propagation in the whole combustion system is then described by acomplementary systems of acoustic perturbation equations to the incompressible CFD system, as it wasd eveloped by Ewert and Schröder [11] and later Bui et al [12] and Seo and Moon [13]. The required acoustic sources are obtained from an analysis of the CFD simulation results.…”

Section: Introductionmentioning

confidence: 99%

CAA Simulation and Intensity Based Evaluation of a Model Experiment for Indirect Combustion Noise

Richter¹,

Morgenweck²,

Thiele³

2009

Acta Acustica united with Acustica

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The efficient prediction of combustion noise by azonal approach is discussed. Forthe so called propagation zone an optimized finite difference method adopted from fantone noise propagation is applied together with alinear perturbation approach based on the Euler equations. Special attention is payed to the indirect noise generation in the propagation zone, where initially quiet perturbations of the fluid state radiate noise when accelerated or decelerated in av arying base flowregime. Anon-isentropic mathematical model is chosen. The approach is compared with apreviously published experiment for the assessment of indirect combustion noise. The numerical results showthe strong influence of reflections from the inflowboundary of the plenum on the resulting pressure response in the outlet duct. By assuming reasonable reflections from the plenum, the observed time signal of the pressure reaches ar easonable agreement between numerical simulation and experiment. Furthermore, the acoustic intensity is used to showthe good quality of the numerical solution. Finally,the intensity based source location identifies the nozzle as adominant source of sound, with large magnitudes of generation and annihilation of acoustic energy.The source power found in the heated volume is more than twoorders of magnitude smaller than in the nozzle. This result again underlines the importance of indirect combustion noise. PACS no. 43.20.Mv,43.28.Kt, 43.60.Jn ACTA ACUSTICA UNITED WITH ACUSTICA Richter et al.:M odel experiment forindirect combustion noise Vol. 95 (2009)

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Source Term Evaluation of the APE-RF System

Cited by 7 publications

References 14 publications

Numerical Investigation of Combustion Noise and Sound Source Mechanisms in a Non-Premixed Flame Using LES and APE-RF

Numerical Investigation of Combustion Noise and Sound Source Mechanisms in a Non-Premixed Flame Using LES and APE-RF

Numerical analysis of the acoustic field of reacting flows via acoustic perturbation equations

CAA Simulation and Intensity Based Evaluation of a Model Experiment for Indirect Combustion Noise

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