Parametric study on state-of-the-art analytical models for fan broadband interaction noise predictions

Lewis, Danny; Laborderie, Jerome de; Sanjosé, Marlène; Moreau, Stéphane; Jacob, Marc C.; Masson, Vianney

doi:10.1016/j.jsv.2021.116423

Cited by 12 publications

(10 citation statements)

References 69 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recently, Lewis et al [21] performed a very detailed comparison of different analytical models with the NASA SDT data base, namely Ventres' [26], Hanson's [27] , Posson's [28,29] and Masson's [10] models. As already mentioned in [2], a thorough validation of the model implementation was achieved.…”

Section: Broadband Noisementioning

confidence: 99%

“…Moreover, accounting for subcritical gusts improves the low-frequency predictions as was found previously by Moreau & Roger [37,38] for isolated airfoils, Roger for an annular airfoil [39] and Posson & Roger [40] for rectilinear cascades. Lewis et al [21] also compared the three-dimensional cascade response with Amiet's isolated airfoil response, and showed that both vane responses do not agree for high-solidity configurations, even at high frequency, contrarily to what was found before in 2D [41] and consistently with what Grace found by introducing 6 of 24 the spanwise wave number in her RSI code [42]. In summary, only full three-dimensional models give results that are consistent with experimental data, confirming that both a proper three-dimensional flow description and the use of three-dimensional cascade response are mandatory to carry out analytically based acoustic predictions.…”

Section: Broadband Noisementioning

confidence: 99%

See 1 more Smart Citation

Turbomachinery Noise Review

Moreau,

Roger

2023

Preprint

View full text Add to dashboard Cite

The present paper is aimed at presenting an updated review of prediction methods for the aerodynamic noise of ducted rotor-stator stages. Indeed, ducted rotating-blade technologies are in continuous evolution and increasingly used, for both aeronautical propulsion units, power generation and air conditioning systems. Different needs are faced, from the early design stage to the final definition of a machine. Fast-running, approximate analytical approaches and high-fidelity numerical simulations are considered as the best suited tools for each, respectively. Recent advances are discussed, with emphasis on their pros and cons.

show abstract

Section: Broadband Noisementioning

confidence: 99%

Section: Broadband Noisementioning

confidence: 99%

Turbomachinery Noise Review

Moreau,

Roger

2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Rotor-stator interaction noise results from the interaction of turbulence in the rotor wakes with the leading edge of the stator, which generates an unsteady loading on the vanes. The rotor-stator interaction noise mechanism is often considered to be the dominant noise source of the fan stage at approach condition [7,8]. Over the past few decades, several techniques have been developed to model and predict both trailing edge and rotor-stator interaction noise [3,9].…”

Section: Introductionmentioning

confidence: 99%

“…Several analytical models are available for the prediction of fan broadband noise [8,9]. Initial analytical models considered either the turbulent flow impinging on the leading edge of an isolated airfoil or the diffraction of a turbulent boundary layer at the airfoil TE [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Direct noise predictions of fan broadband noise using LES and analytical models

Al-Am

Clair

Giauque

et al. 2022

28th AIAA/CEAS Aeroacoustics 2022 Conference

View full text Add to dashboard Cite

In the present study, we analyze the broadband noise of an ultra high by-pass ratio fan/OGV stage developed at Ecole Centrale de Lyon. Wall-modeled large eddy simulations (LES) of a periodic fan/OGV sector are performed at approach conditions on an unstructured grid that is well refined for direct noise propagation. Comparisons between wall-resolved and wallmodeled computations are performed using a 2.5D simplified configuration of the fan/OGV stage, and show a good agreement. This justifies the use of wall-modeled simulations for the full-span configuration. A good agreement is found between LES and RANS aerodynamic results. However, some differences can be found in the tip gap region and near the hub, where large coherent structures appear. Additionally, a small recirculation bubble can be observed from approximately 60% of the fan blade span in the LES. In this study, the broadband noise is directly computed from the fully-compressible LES solver and compared with predictions from available analytical models. The input data for the analytical models, such as mean and turbulent flow statistics, are obtained from the LES computation. A good agreement is found for the predicted sound power levels between direct LES noise predictions and the LES-informed analytical models. This confirms the capability of the LES numerical setup to directly predict far-field noise. However, some discrepancies can be observed at low frequencies. These might be attributed to the additional noise sources that are present in the LES, which are not considered by the analytical models.

show abstract

“…A number of highly detailed noise and flow measurements have also been made on engines but these are usually done at laboratory-scale where the flow conditions do not precisely match those in a full-scale engine [6,7]. A comprehensive study regarding the impact of different assumptions made in the analytical models on noise predictions can be found in [8].…”

Section: Introductionmentioning

confidence: 99%

Proper Orthogonal Decomposition Method for the Prediction of Fan Broadband Interaction Noise

2022

View full text Add to dashboard Cite

The turbulent wakes generated by a rotor interacting with outlet guide vanes (OGVs) is one of the dominant broadband noise sources in a turbofan engine. An accurate representation of the rotor wake turbulence is therefore important for the reliable prediction of the rotor-OGV interaction noise. This paper presents a turbulence synthesis method based on a spectral Proper Orthogonal Decomposition (POD) representation of the turbulent wake that aims to reproduce the desired velocity cross-spectrum along the OGV leading edges where noise is emitted due to turbulence-OGVs interaction. The method is first developed in the frequency domain based on a superposition of vortical modes with the appropriate amplitudes. Fourier modes and POD modes are proposed to represent the two-point velocity spectrum. The POD modes will be shown to be highly efficient in reconstructing the flow field near the tip region where a largescale coherent structure is present. An extension of the POD synthetic turbulence method to the time domain is also presented by means of a white noise filtering technique to allow the generation of time varying velocity signals with the desired cross spectral characteristics. The results show that both the one-and two-point statistics can be closely reproduced. The proposed frequency-domain POD synthetic turbulence method for fan broadband noise prediction for a realistic fan-OGV configuration is illustrated by the use of a frequency-domain linearised Navier-Stokes solver to predict the sound power radiation due to each vortical mode. Overall sound power levels at a number of discrete frequencies are predicted and compared against measured noise data. Agreement is found to be within the uncertainty of the noise sound power measurement.

show abstract

Parametric study on state-of-the-art analytical models for fan broadband interaction noise predictions

Cited by 12 publications

References 69 publications

Turbomachinery Noise Review

Turbomachinery Noise Review

Direct noise predictions of fan broadband noise using LES and analytical models

Proper Orthogonal Decomposition Method for the Prediction of Fan Broadband Interaction Noise

Contact Info

Product

Resources

About