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Research Papers

Turbine Tone Noise Prediction Using a Linearized Computational Fluid Dynamics Solver: Comparison With Measurements

[+] Author and Article Information
Adolfo Serrano González

ITP Industria de Turbo Propulsores S.A.,
Alcobendas, Madrid 28108, Spain
e-mail: adolfo.serrano@itp.es

José Ramón Fernández Aparicio

ITP Industria de Turbo Propulsores S.A.,
Alcobendas, Madrid 28108, Spainy
e-mail: joseramon.fernandez@itp.es

1Corresponding author.

Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received November 16, 2015; final manuscript received December 2, 2015; published online February 9, 2016. Editor: Kenneth C. Hall.

J. Turbomach 138(6), 061006 (Feb 09, 2016) (10 pages) Paper No: TURBO-15-1264; doi: 10.1115/1.4032285 History: Received November 16, 2015; Revised December 02, 2015

The capability of a linearized computational fluid dynamics (CFD) method for predicting turbine tone noise is investigated through comparison with measurements. To start with, a benchmark problem on flat plates is presented, and results are put together with those published by other authors. Then, numerical predictions are compared with measurements from two low-pressure turbines (LPTs), which have been tested in different facilities. The first specimen is a three-stage cold flow rig, noise tested in the Centro de Tecnologías Aeronáuticas (CTA) facility (Bilbao, Spain) in 2012 and funded by the Clean Sky EU Program. The second is the advanced near-term low emissions (ANTLE) LPT rig, full-scale, cold flow, noise tested in the twin shaft test facility (TSTF) in Rolls-Royce (Derby, UK) in 2005 and funded by the SILENCE(R) EU Funded Program. The comparison includes multistage effects, clocking sensitivities, and acoustic scattering through outlet guide vanes (OGVs).

Copyright © 2016 by ASME
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Figures

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Fig. 1

Flat-plate computational domain and grid

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Fig. 2

Test case 1: instantaneous axial velocity (left) and pressure (right) contours

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Fig. 3

Normalized unsteady pressure jump over the stator

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Fig. 4

Normalized Cmn amplitude for downstream waves downstream the stator (mode 8)

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Fig. 5

Normalized Cmn amplitude for upstream waves upstream the stator (mode 8)

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Fig. 6

Schematic view of the noise instrumentation build

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Fig. 8

Test case 2: instantaneous axial velocity contours of stator 2 wake at 95% NSS

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Fig. 9

Unsteady pressure module as a function of clocking between S2 (center vane) and S3 (vanes on both sides of the picture), at LPT exit. 1LPT1 tone, B1–2V2/3 mode at 95% NSS. Dashed lines represent the eight clocking positions tested.

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Fig. 10

Unsteady pressure module as a function of clocking between S2 (center vane) and S3 (vanes on both sides of the picture), at LPT exit. 1LPT1 tone, B1–2V2/3 mode at 120% NSS. Dashed lines represent the eight clocking positions tested.

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Fig. 11

Unsteady pressure module of mode B1–2V2/3 for four of the eight clocking position tested. Results at LPT outlet for 95% NSS (left) and 120% NSS (right).

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Fig. 12

Measured versus predicted modal energy for 1LPT1, 1LPT2, and 1LPT3 at various shaft speeds

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Fig. 13

Modal energy for 1LPT1–mode B1–2V2/3 at 95% NSS. CFD (left) versus experiment (right).

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Fig. 14

Modal energy for 1LPT2–mode B2–V2/3 at 95% NSS. CFD (left) versus experiment (right).

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Fig. 15

Modal energy for 1LPT3–mode B3–V3 at 95% NSS. CFD (left) versus experiment (right).

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Fig. 16

Modal energy for 1LPT1–mode B1–2V2/3 at 120% NSS. CFD (left) versus experiment (right).

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Fig. 17

Modal energy for 1LPT2–mode B2–V2/3 at 120% NSS. CFD (left) versus experiment (right).

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Fig. 18

Modal energy for 1LPT3–mode B3–V3 at 120% NSS. CFD (left) versus experiment (right).

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Fig. 19

Schematic view of the TSTF

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Fig. 21

Test case 3: instantaneous velocity contours at rotor inlet

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Fig. 22

Test case 3: instantaneous pressure contours at OGV inlet, midspan, and exit

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Fig. 23

2LPT4 tone evolution: measured versus predicted

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Fig. 24

2LPT4 modal content at OGV exit at approach conditions: CFD (left) and measurements (right)

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Fig. 25

2LPT4 modal content at OGV exit at cutback conditions: CFD (left) and measurements (right)

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