Tonal Noise Prediction of a Modern Turbofan Engine With Large Upstream and Downstream DistortionSource: Journal of Turbomachinery:;2019:;volume( 141 ):;issue: 002::page 21010Author:Daroukh, Majd
,
Moreau, Stéphane
,
Gourdain, Nicolas
,
Boussuge, Jean-François
,
Sensiau, Claude
DOI: 10.1115/1.4042163Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Ultra-high bypass ratio (UHBR) engines are designed as compact as possible and are characterized by a short asymmetric air inlet and heterogeneous outlet guide vanes (OGVs). The flow close to the fan is therefore circumferentially nonuniform (or distorted) and the resulting noise might be impacted. This is studied here at take-off conditions by means of a simulation of the unsteady Reynolds-averaged Navier–Stokes (URANS) equations of a full-annulus fan stage. The model includes an asymmetric air inlet, a fan, heterogeneous OGVs, and homogeneous inlet guide vanes (IGVs). Direct acoustic predictions are given for both inlet and aft noises. A novel hydrodynamic/acoustic splitting method based on a modal decomposition is developed and is applied for the aft noise analysis. The noise mechanisms that are generally considered (i.e., interaction of fan-blade wakes with OGVs and fan self-noise) are shown to be impacted by the distortion. In addition, new sources caused by the interaction between the stationary distortion and the fan blades appear and contribute to the inlet noise.
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contributor author | Daroukh, Majd | |
contributor author | Moreau, Stéphane | |
contributor author | Gourdain, Nicolas | |
contributor author | Boussuge, Jean-François | |
contributor author | Sensiau, Claude | |
date accessioned | 2019-03-17T09:52:02Z | |
date available | 2019-03-17T09:52:02Z | |
date copyright | 1/31/2019 12:00:00 AM | |
date issued | 2019 | |
identifier issn | 0889-504X | |
identifier other | turbo_141_02_021010.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl1/handle/yetl/4255739 | |
description abstract | Ultra-high bypass ratio (UHBR) engines are designed as compact as possible and are characterized by a short asymmetric air inlet and heterogeneous outlet guide vanes (OGVs). The flow close to the fan is therefore circumferentially nonuniform (or distorted) and the resulting noise might be impacted. This is studied here at take-off conditions by means of a simulation of the unsteady Reynolds-averaged Navier–Stokes (URANS) equations of a full-annulus fan stage. The model includes an asymmetric air inlet, a fan, heterogeneous OGVs, and homogeneous inlet guide vanes (IGVs). Direct acoustic predictions are given for both inlet and aft noises. A novel hydrodynamic/acoustic splitting method based on a modal decomposition is developed and is applied for the aft noise analysis. The noise mechanisms that are generally considered (i.e., interaction of fan-blade wakes with OGVs and fan self-noise) are shown to be impacted by the distortion. In addition, new sources caused by the interaction between the stationary distortion and the fan blades appear and contribute to the inlet noise. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | Tonal Noise Prediction of a Modern Turbofan Engine With Large Upstream and Downstream Distortion | |
type | Journal Paper | |
journal volume | 141 | |
journal issue | 2 | |
journal title | Journal of Turbomachinery | |
identifier doi | 10.1115/1.4042163 | |
journal fristpage | 21010 | |
journal lastpage | 021010-11 | |
tree | Journal of Turbomachinery:;2019:;volume( 141 ):;issue: 002 | |
contenttype | Fulltext |