Investigations Regarding the Simulation of Wall Noise Interaction and Noise Propagation in Swirled Combustion Chamber Flows

Richter, Christoph; Panek, Łukasz; Krause, Verina; Thiele, Frank

doi:10.1007/978-3-642-02038-4_8

Cited by 6 publications

(5 citation statements)

References 19 publications

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“…The combustion also generates unsteady shear leading to vorticity perturbations [19], which also convect and generate pressure perturbations as they accelerate through the turbine nozzle guide vanes. Hence, at the combustor exit the interaction of the vortical and entropic perturbations with the mean streamwise velocity gradient results in energy transfer to an acoustic mode [19,20]. Acceleration of entropy and vorticity waves in the choked nozzle results in generation of pressure waves that propagate upstream (from where they can be reflected from the flame zone and/or the upstream geometry altering the downstream propagating waves) and downstream from the turbine stage as indirect combustion noise [12,17,18].…”

Section: Motivation: Gas Turbine Combustion Noise Sourcesmentioning

confidence: 99%

Combustion noise

Dowling

Mahmoudi

2015

Proceedings of the Combustion Institute

260

182

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Section: Motivation: Gas Turbine Combustion Noise Sourcesmentioning

confidence: 99%

Combustion noise

Dowling

Mahmoudi

2015

Proceedings of the Combustion Institute

260

182

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“…In fact, most of the equations used for CAA modeling can be rearranged in order to include heat release in the acoustic source terms, e.g. in [18,19,20] (see also equation 5).I ti sh owever commonly avoided because the reaction rates of the species, which are principally required to evaluate the heat release rate, are not known (see section 2.3). In this case, as the solution of mass equations for each species may be computationally too expensive,modeling of reaction kinetics in most applications of combustion simulation is forced to use simplifiedorreduced chemistry [21], for example, in frame work of at abulation procedure with the ILDM (Intrinsic Low Dimensional Manifold)o rthe FGM (Flamelet Generated Manifold)approach [22].…”

Section: Introductionmentioning

confidence: 98%

“…Due to its simplicity,L ighthill'sa nalogy as well as its modifications are widely used for combustion noise problem in the last decade [3,9,10,11,12,13]. Recently,o ther more sophisticated methods, such as the Phillips' analogy [14], the Linearized Euler-Equations (LEE) [ 5] and the APE (Acoustic Perturbation Equations)system [15], have been successfully applied for the prediction of combustion noise [16,17,18], which are derivedf rom the governing equations for afl owing fluid as well. The Phillips' analogy is represented by awaveequation for the logarithmic pressure.…”

Section: Introductionmentioning

confidence: 99%

On Prediction of Combustion Generated Noise with the Turbulent Heat Release Rate

Zhang¹,

Habisreuther²,

Bockhorn³

et al. 2013

Acta Acustica united with Acustica

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The work aims to develop and to validate hybrid LES/CAA techniques for numerical computation of direct combustion noise exclusively using the unsteady heat release as main source for the CAA modeling. In order to calculate the unsteady heat release, compressible LES has been carried out for amoderately turbulent jet flame employing ac ombustion model, which is based on tabulation of chemical scalars to include reaction kinetics and modeling the turbulent flame speed to account for flame-turbulence interaction. As the heat release is not explicitly known due to the use of tabulated chemistry,an ew method has been introduced first to evaluate this parameter from turbulent combustion modeling. Forthe CAA simulation, arearranged Lighthill wave equation has been used, where the source term is essentially built up by the heat release rate and provided by the LES. The sound pressure levelderivedfrom the CAA computation showed areasonable good agreement with the measured microphone da ta. In addition, with help of the heat release calculated from LES, the analytical solution of the CAA equation has been explored in order to predict noise emissions without solving the corresponding acoustic equation. Applicability of this approach has provedtobepromising. PACS no. 43.28.Kt, 43.28.Ra 940 ©S.Hirzel Verlag · EAA Zhang et al.:P rediction of combustion noise ACTA ACUSTICA UNITED WITH ACUSTICA Vol. 99 (2013)

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“…Pressure perturbations generated by fluctuation in heat release rate from the turbulent flame constitute the 'direct' acoustic noise. The 'indirect' noise is generated due to the acceleration of entropy and vorticity waves through the turbine blade rows [5][6][7]. Recent studies have shown that the indirect noise due to vorticity gives a negligible contribution to the total noise generated in the aircraft [3].…”

Section: Introductionmentioning

confidence: 99%

Low-Order Modeling of Combustion Noise in an Aero-Engine: The Effect of Entropy Dispersion

Mahmoudi

Giusti

Mastorakos

et al. 2017

Journal of Engineering for Gas Turbines and Power

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The present work studies the effect of entropy dispersion on the level of combustion noise at the turbine outlet of the Rolls-Royce ANTLE aero-engine. A new model for the decay of entropy waves, based on modeling dispersion effects, is developed and utilized in a low-order network model of the combustor (i.e., LOTAN code that solves the unsteady Euler equations). The proposed model for the dispersion of entropy waves only requires the mean velocity field as an input, obtained by Reynolds-averaged Navier–Stokes (RANS) computations of the demonstrator combustor. LOTAN is then coupled with a low-order model code (LINEARB) based on the semi-actuator disk model that studies propagation of combustion noise through turbine blades. Thus, by combining LOTAN and LINERAB, the combustion noise and its counterparts, direct and indirect noise, generated at the turbine exit are predicted. In comparison with experimental data, it is found that without the inclusion of entropy dispersion, the level of combustion noise at the turbine exit is overpredicted by almost 2 orders of magnitude. The introduction of entropy dispersion in LOTAN results in a much better agreement with the experimental data, highlighting the importance of entropy wave dispersion for the prediction of combustion noise in real engines. In more detail, the agreement with the experiment for high and low frequencies was very good. At intermediate frequencies, the experimental measurements are still overpredicted; however, the predicted noise is much smaller compared to the case without entropy dispersion. This discrepancy is attributed to (i) the role of turbulent mixing in the overall decay of the entropy fluctuations inside the combustor, not considered in the model developed for the decay of entropy waves, and (ii) the absence of a proper model in LINEARB for the decay of entropy waves as they pass through the turbine blade rows. These are areas that still need further development to improve the prediction of low-order network codes.

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Investigations Regarding the Simulation of Wall Noise Interaction and Noise Propagation in Swirled Combustion Chamber Flows

Cited by 6 publications

References 19 publications

Combustion noise

Combustion noise

On Prediction of Combustion Generated Noise with the Turbulent Heat Release Rate

Low-Order Modeling of Combustion Noise in an Aero-Engine: The Effect of Entropy Dispersion

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