Investigation of Fan Wake-OGV Interaction Broadband Noise

Huang, Ju; Mani, Ramani; Vyšohlíd, Martin; Sharma, Anupam

doi:10.2514/6.2013-2151

Cited by 6 publications

(3 citation statements)

References 30 publications

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“…For the three-dimensional model, the influence of the radial wavenumber cannot be ignored. In order to take into account the influence of the radial wave number, Ju et al [27] proposed a two-dimensional equivalent correction method to consider the influence of the radial wave number. Then, the unsteady load l * (ξ, k 1 , k 2 , k 3 ) on the vane surface is solved by using the two-dimensional cascade linear unsteady theory of Smith [28], and the load distribution L(ξ, r) on the vane surface can be obtained:…”

Section: Broadband Noise Prediction Modelmentioning

confidence: 99%

Broadband Noise Reduction of a Two-Stage Fan with Wavy Trailing-Edge Blades

Gao,

Chen,

Tong

et al. 2024

Aerospace

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In this paper, a numerical investigation is performed to study the broadband noise of a fan stage with wavy trailing-edge blades. A study of the wavelength and ratio of amplitude to wavelength (H/L) is conducted to better understand the noise reduction effect of wavy trailing-edge blades. A rotor–stator interaction broadband noise prediction method based on the result of a Reynolds-averaged Navier–Stokes equation is used. The results show that all wavy trailing-edge configurations reduce the sound power level of the fan stage. The noise reduction effect of H20L10 is the best among all the wavy trailing-edge configurations, and the sound power level is reduced by 2.4 dB at 1000 Hz. When the H/L remains unchanged, the noise reduction effect of the wavy trailing-edge configuration increases with the increase in wavelength. When the wavelength remains unchanged, the noise reduction effect of the wavy trailing-edge configuration with an H/L of 2 is the best. The use of wavy trailing-edge configurations reduces the turbulent kinetic energy and turbulent integral length scale upstream of the stator by changing the wake of the rotor, thereby reducing the rotor–stator interaction broadband noise of the fan stage.

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Section: Broadband Noise Prediction Modelmentioning

confidence: 99%

Broadband Noise Reduction of a Two-Stage Fan with Wavy Trailing-Edge Blades

Gao,

Chen,

Tong

et al. 2024

Aerospace

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“…Many simulation methods have been proposed for predicting the broadband noise. Some that focus on the dominant interaction noise use a two-step approach in which the wake turbulence is modelled or obtained via experiment as a first step and then the interaction of the turbulence with the FEGV is considered as a second step [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. For the two-step approaches to be useful in the design process, simulated wake turbulence quantities upstream of the FEGV are required.…”

Section: Introductionmentioning

confidence: 99%

Analysis of fan-stage gap-flow data to inform simulation of fan broadband noise

Grace

Gonzalez-Martino

Casalino

2019

Phil. Trans. R. Soc. A.

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Time-resolved simulations present a new opportunity for studying the disturbances responsible for the broadband interaction noise created by the fan stage. In this paper, two vane configurations from the source diagnostic test at the approach rotor speed were computed with PowerFLOW's very large-eddy simulation (VLES) method using two solution strategies: a coarser mesh near the rotor and a trip to trigger turbulent transition on the rotor; and a much finer mesh near the rotor with no trip. The simulated data allow for an investigation of the potential effect from the vane configuration and an in-depth study of the mean and turbulent flow in the interstage gap. A challenge related to post-processing of high-resolution simulations is discussed. Comparison of the flow quantities with previously obtained Reynolds Averaged Navier–Stokes simulation results indicates that little advantage is gained by running a lattice Boltmann method (LBM)/VLES to simply recover the gap flow parameters for use with a lower-order fan broadband interaction noise calculation method. The true benefit of the LBM/VLES is that the noise calculation can be directly and simultaneously completed with the flow simulation. This article is part of the theme issue ‘Frontiers of aeroacoustics research: theory, computation and experiment’.

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“…Many low-order methods for simulating broadband interaction noise downstream of a fan stage in a turbofan engine have emerged recently [1][2][3][4] . These methods all rely on a simplified model of the fan exit guide vane (FEGV) that replaces the real vane with a flat vane.…”

Section: Introductionmentioning

confidence: 99%

Investigation of methods for including vane geometry in predictions of fan broadband noise

Grace

Villafranco

Wixom

2016

22nd AIAA/CEAS Aeroacoustics Conference

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Two methods for increasing the geometric fidelity of a fan-stage, broadband, interaction-noise model are investigated. The increase in fidelity is sought in order to eliminate the dependence on stagger selection that exists when vanes are modeled as flat plates. First, a blade-vortex interaction (BVI) technique is considered for obtaining a subsonic, 2D, unsteady, real-geometry cascade response that can be readily incorporated into an existing low-order broadband model. A description of the overall method and results from the development of the cascade-BVI are presented. Second, a method for utilizing a linearized Euler calculation that has been presented in the literature previously is reviewed and discussed. Preliminary findings from an attempt to utilize LINFLUX as the linearized Euler solver in the broadband model are described.

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Investigation of Fan Wake-OGV Interaction Broadband Noise

Cited by 6 publications

References 30 publications

Broadband Noise Reduction of a Two-Stage Fan with Wavy Trailing-Edge Blades

Broadband Noise Reduction of a Two-Stage Fan with Wavy Trailing-Edge Blades

Analysis of fan-stage gap-flow data to inform simulation of fan broadband noise

Investigation of methods for including vane geometry in predictions of fan broadband noise

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