Fan-OGV interaction broadband noise prediction in a rigid annular duct with swirling and sheared mean flow

Masson, Vianney; Posson, Hélène; Sanjosé, Marlène; Leonard, Thomas M.; Moreau, Stéphane; Roger, Michel

doi:10.2514/6.2016-2944

Cited by 21 publications

(14 citation statements)

References 24 publications

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“…Those observations were confirmed by e.g. Masson et al [32] for realistic flows with swirl and shear. This described effect could impact the azimuthal mode order 6 at BPF 3.…”

Section: Consideration Of Numerical Dissipationsupporting

confidence: 70%

The Challenge of Tonal Fan Noise Prediction for an Aircraft Engine in Flight

Kissner¹,

Guérin²,

Enghardt³

et al. 2019

Acta Acustica united with Acustica

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Expensive flyover tests are needed to verify that noise certification standards are fulfilled. Currently, no numerical alternative exists to perform a holistic "virtual fly-over" test. As a step towards enabling such evaluations in the future, the authors focus on an isolated noise source-the tonal rotor-stator-interaction (RSI) of the fan stage. A high-fidelity simulation relying on a state-of-the-art yet computationally efficient method is performed for a V2527 aircraft engine in approach conditions. The computational domain includes the noise generation in the fan stage, its propagation in the engine inlet and bypass duct, as well as its radiation into the far field. Installation effects due to bifurcations and struts in the duct, ESS (engine section stator), liners, and inflow distortions are not considered. Post-processing methods are introduced and applied to the numerical data to allow for a meaningful comparison of the results to microphone data recorded during flyover experiments. In particular, great care is taken to quantify the numerical dissipation of the simulation inside the nacelle and to enable a suitable correction of the numerical data. The numerical simulation cannot fully reproduce the experimental data indicating that its level of complexity is not yet sufficient. As there is no obvious cause for the mismatch, it would be necessary to incrementally increase the complexity of the simulation in order to pinpoint the most significant sources and effects.

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“…Those observations were confirmed by e.g. Masson et al [32] for realistic flows with swirl and shear. This described effect could impact the azimuthal mode order 6 at BPF 3.…”

Section: Consideration Of Numerical Dissipationsupporting

confidence: 70%

The Challenge of Tonal Fan Noise Prediction for an Aircraft Engine in Flight

Kissner¹,

Guérin²,

Enghardt³

et al. 2019

Acta Acustica united with Acustica

View full text Add to dashboard Cite

show abstract

“…The complete model was again validated on the NASA-SDT turbofan test-cases [61]. More recently Masson et al [62] have extended such a model by accounting for swirl using the generalized Green's function proposed by Posson and Peake [12].…”

Section: Analytical Modelmentioning

confidence: 99%

Turbomachinery Noise Predictions: Present and Future

Moreau

2019

Acoustics

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In future Ultra-High By-Pass Ratio turboengines, the turbomachinery noise (fan and turbine stages mainly) is expected to increase significantly. A review of analytical models and numerical methods to yield both tonal and broadband contributions of such noise sources is presented. The former rely on hybrid methods coupling gust response over very thin flat plates of finite chord length, either isolated or in cascade, and acoustic analogies in free-field and in a duct. The latter yields tonal noise with unsteady Reynolds-Averaged Navier–Stokes (u-RANS) simulations, and broadband noise with Large Eddy Simulations (LES). The analytical models are shown to provide good and fast first sound estimates at pre-design stages, and to easily separate the different noise sources. The u-RANS simulations are now able to give accurate estimates of tonal noise of the most complex asymmetric, heterogeneous fan-Outlet Guiding Vane (OGV) configurations. Wall-modeled LES on rescaled stage configurations have now been achieved on all components: a low-pressure compressor stage, a transonic high-pressure turbine stage and a fan-OGV configuration with good overall sound power level predictions for the latter. In this case, hybrid Lattice–Boltzmann/very large-eddy simulations also appear to be an excellent alternative to yield both contributions accurately at once.

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“…Moreover, the presence of a swirling flow in the fan-OGV inter-stage will also modify the radiated powers. An analogy that accounts for this effect has been derived recently [15,16], and the first studies stressed its importance [36]. Those advanced prediction methods should improve the acoustic predictions that are made in the present study.…”

mentioning

confidence: 73%

Effect of Distortion on Turbofan Tonal Noise at Cutback with Hybrid Methods

Daroukh

Moreau

Gourdain³

et al. 2017

IJTPP

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New ultra high bypass ratio architectures may significantly affect the fan tonal noise of future aircraft engines. Indeed, such a noise source is supposed to be dominated by the interaction of fan-blade wakes with outlet guide vanes. However, shorter nacelles in these engines are expected to trigger an important air-inlet distortion that can be responsible for new acoustic sources on the fan blades. Full annulus simulations based on the unsteady Reynolds-averaged Navier-Stokes equations are presently used to study this effect. Simulation results show that the air-inlet distortion has a main effect in the fan-tip region, leading to a strong variation of the fan-blade unsteady loading. It also significantly modifies the shape of the fan-blade wakes and, consequently, the unsteady loading of the outlet guide vanes. Acoustic predictions based on the extension of Goldstein's analogy to an annular duct in a uniform axial flow are presented and show that the fan sources notably contribute to the fan tonal noise. The air-inlet distortion is responsible for an increase of the noise radiated by both the fan and the outlet guide vane sources, leading to a global noise penalty of up to three decibels.

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Fan-OGV interaction broadband noise prediction in a rigid annular duct with swirling and sheared mean flow

Cited by 21 publications

References 24 publications

The Challenge of Tonal Fan Noise Prediction for an Aircraft Engine in Flight

The Challenge of Tonal Fan Noise Prediction for an Aircraft Engine in Flight

Turbomachinery Noise Predictions: Present and Future

Effect of Distortion on Turbofan Tonal Noise at Cutback with Hybrid Methods

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