Waves Transmission and Generation in Turbine Stages in a Combustion-Noise Framework

Leyko, Mateusz; Moreau, Stéphane; Nicoud, Franck; Poinsot, Thiérry

doi:10.2514/6.2010-4032

Cited by 17 publications

(19 citation statements)

References 14 publications

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“…6,25 Indeed, turbulence mixing induced by the turbine blades generates a planar wave distortion of entropy waves through the first stages and no more indirect noise generation in the last stages. To take into account this low-pass filter behaviour of the turbine stages, a scaling function was implemented based on the characteristic pitch of a blade row and the mean axial velocity of the flow.…”

Section: Chorus : An Actuator Disk Theorymentioning

confidence: 99%

Numerical investigation of combustion noise generation in a full annular combustion chamber

Livebardon

Moreau

Poinsot

et al. 2015

21st AIAA/CEAS Aeroacoustics Conference

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This paper presents a numerical strategy to predict combustion noise levels within a real turboshaft engine based on LES of combustion chamber coupled with an actuator disk theory to mimic the acoustic behaviour of the turbine stages. A first LES of a single-sector of the combustor is compared with a full-scale LES of the annular combustion chamber where the single-sector LES is found to be sufficient to correctly predict the mean flow features and the main mechanisms responsible for entropy spots generation. Nevertheless, the single-sector failed to capture properly the acoustic mode distribution. The unsteady fields provided by the LES are used to build the acoustic and convective waves at the combustor exit. Indirect and direct combustion noise levels computed with the actuator disk theory are compared with experimental results within the turbine stages for which reasonable agreements were found. Particularly, the first azimuthal modes extracted from the full-scale LES contribute significantly to the overall noise predictions.

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Section: Chorus : An Actuator Disk Theorymentioning

confidence: 99%

Numerical investigation of combustion noise generation in a full annular combustion chamber

Livebardon

Moreau

Poinsot

et al. 2015

21st AIAA/CEAS Aeroacoustics Conference

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“…In this context, the goal of the present study is to extend the previous work of Leyko et al [24,23] to the propagation of waves through a complete realistic turbine stage, containing both a stator and a rotor. The 2D analytical model of Cumpsty and Marble [9] is first explained in Section 2, and then extended to take into account the effect of the rotor blade.…”

mentioning

confidence: 89%

“…For this reason the wave post processing is performed in the full inlet and outlet regions to calculate the transmitted and reflected waves for each simulation. The post processing is then performed in 5 steps, as proposed by Leyko et al [24] for the single stator case:…”

Section: Post Processing Of the Wavesmentioning

confidence: 99%

“…To include the additional effect of entropy waves, Cumpsty and Marble [9] extended the aforementioned 1D analytical model of Marble and Candel [31] to a stator vane in a 2D configuration at midspan accounting for the significant effect of flow deviation in a turbine, and including vorticity waves through the stator vane. This method was compared by Leyko et al [24,23] with numerical simulations for the case of a stator vane showing that the compact low frequency limit of the analytical method predicted correctly the transfer functions (both the reflected and transmitted acoustic waves) gen erated by acoustic and entropy waves. For the case of direct noise, the compact solution was shown to be valid over a wide range of frequencies.…”

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confidence: 99%

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Transmission and reflection of acoustic and entropy waves through a stator–rotor stage

Bauerheim

Durán

Livebardon

et al. 2016

Journal of Sound and Vibration

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“…The subsonic configuration has been reproduced numerically by Mühlbauer et al (2009), Giauque et al (2012) and Durán, Moreau & Poinsot (2013b) and has also been investigated analytically by Howe (2010). Dealing with the turbine configuration, Leyko et al (2010), Durán et al (2013a) and Mishra & Bodony (2013) numerically investigated the actuator disk theory by comparing two-dimensional simulations with the analytical model of Cumpsty & Marble (1977) in the presence of small amplitude entropy perturbations. Leyko et al and Durán et al conducted LES of an isolated blade row and separate stator vane and rotor blade, respectively, while Mishra and Bodony performed Euler simulations of a flow past a realistic stator stage.…”

Section: Introductionmentioning

confidence: 99%

A nonlinear model for indirect combustion noise through a compact nozzle

Huet

Giauque

2013

J. Fluid Mech.

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The present paper deals with the generation of sound by the passage of acoustic or entropy perturbations through a nozzle in the nonlinear regime and in the lowfrequency limit. The analytical model of Marble and Candel for compact nozzles (J. Sound Vib., vol. 55, 1977, pp. 225-243), initially developed for excitations in the linear regime, is rederived and extended to the nonlinear domain. Full nonlinear and second-order models are written for both subcritical and supercritical nozzles in the absence of shock and a detailed methodology is provided for the resolution of the second-order system. The accuracy of the second-order model is assessed for entropy forcings. It is shown to be accurate for all waves, with the exception of the upstream generated wave for subcritical diverging geometries where higher-order nonlinear contributions cannot be neglected. In the context of indirect combustion noise, the phenomenon of regime change of the nozzle due to an incoming entropy fluctuation is also addressed. Regime change is related to a Mach number modification induced by temperature and velocity fluctuations. In the present study, it translates into a limitation of the maximum amplitude of the incoming entropy forcing. Such limitations are to be considered for subcritical nozzles with significant inlet or outlet Mach numbers, where the flow transition is observed even for very low-amplitude entropy excitations. With the constraint of those limitations, the analytical extended nozzle describing functions representing the full nonlinear response for indirect combustion noise are validated through detailed comparisons with numerical simulations.

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Waves Transmission and Generation in Turbine Stages in a Combustion-Noise Framework

Cited by 17 publications

References 14 publications

Numerical investigation of combustion noise generation in a full annular combustion chamber

Numerical investigation of combustion noise generation in a full annular combustion chamber

Transmission and reflection of acoustic and entropy waves through a stator–rotor stage

A nonlinear model for indirect combustion noise through a compact nozzle

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