View
221
Download
0
Category
Preview:
Citation preview
SILENCE(R)
page 1Aero Days 2006 - Vienna Eugène Kors - Snecma
SILENCE(R)
SIGNIFICANTLY LOWER COMMUNITY EXPOSURE TO AIRCRAFT NOISE
by Eugène Kors
Co-ordinator of the SILENCE(R) programme
SILENCE(R)
page 2Aero Days 2006 - Vienna Eugène Kors - Snecma
Overview
� SILENCE(R) Scope and Objectives
� Evaluation methodology
� Selection of technologies
• Nacelle
• Engine
• Airframe
SILENCE(R)
page 3Aero Days 2006 - Vienna Eugène Kors - Snecma
Project Coordinator : Snecma Moteurs
No. Of Partners : 51
Objectives :
• Validation of Individual Technologies
• Identification of applicability over the product range
• Cost/ Benefit Analysis
Project Duration : 4 6 years (Start April 2001)
Total Budget : 112 MEuros (50% EC Support)
SILENCE(R) Technology Platform
SILENCE(R)
page 4Aero Days 2006 - Vienna Eugène Kors - Snecma
Progress in Noise Reduction
Entry into Service Date
Sid
elin
e T
ake-
off N
oise
Lev
elco
rrec
ted
for
airc
raft
thru
st
Comet 4
B707
1955 1960 1965 1970 1975 1980 1985 1990 1995 2000
2nd Generation Turbofans
Turbojets
1st Generation Turbofans
DC8
CV880
B720
CV990
Caravelle
B737
DC9
BAe1-11
VC10
Trident 1
B727
Caravelle 10
F28
L1011-500
VFW614
DC10-30
L1011-1DC10-10
B747-200
A300B747-100
B717-200
B737-600
A319-100
B767-300ER
F100
B777-200
MD90
F70
A321
A330
A340
B727-100QF
MD11
A320
B747-400
MD80
B767
A310
B757
BAe146B737-300
DC8-70
20 dB
SILENCE(R)
page 5Aero Days 2006 - Vienna Eugène Kors - Snecma
Years
- 3
- 9
- 6
0
Dec
ibel
s pe
r A
ircra
ft O
pera
tion
Mid-Term & Long-Term Industry ObjectivesConsistent with Vision 2020 /ACARE Goals
Mid-Term & Long-Term Industry ObjectivesConsistent with Vision 2020 /ACARE Goals
Advanced Concepts (Long-Term)Earliest Product Entry
into Service
Earliest Product Entryinto Service
Advanced Concepts (Mid-Term)
Research Initiative Noise Reduction Objectives
Generation 1
Solutions
Generation 2
Solutions
20061998 2002 2010
FP4 and FP5 Projects, including SILENCE(R) => <= FUTURE PROJECTS =>
Derivative products
Future products
Today
2016
SILENCE(R)
page 6Aero Days 2006 - Vienna Eugène Kors - Snecma
Current Aircraft Sensitivity to individual sources
Sideline
51%
2%3%19%
21%4%
Flyover Cutback
24%
1%
1%
32%
36%
6%
Approach
29%
17%
52%
0%0%2%
Jet Turb Comb Fan fwd Fan rwd Airframe
∆∆∆∆EPNLAIRCRAFT∆∆∆∆EPNLSOURCE
SILENCE(R)
page 7Aero Days 2006 - Vienna Eugène Kors - Snecma
How to reach Objectives
Active StatorsActive Wall-Mounted System
Integrated Fan Design
ANTLE & High Speed LP Turbines
UHBR Fan LP Compressor
Exhaust Splitters(radial / circum.)
NegativelyScarfed Intake
3D DistributedLiner
0 Splice Passive Liner
Intake LipLiner
Anti-Icing Adaptive Liner
AdaptiveLiner
Low Noise Core Nozzlew internal/external Plug
Low Noise Fan Nozzle
HF Treated Nozzle
Treated Plug
UHBR Gear Box
SILENCE(R)
page 8Aero Days 2006 - Vienna Eugène Kors - Snecma
HIGH LIFT DEVICES:HIGH LIFT DEVICES:
- Add-on Treatment- Low Noise Design
LANDING GEAR:LANDING GEAR:
- Add-on Treatment- Low Noise Design
Scope of Airframe Noise Reduction Technologies
How to reach Objectives
SILENCE(R)
page 9Aero Days 2006 - Vienna Eugène Kors - Snecma
IMPACT OF FURTHER NOISE REDUCTIONUSING AVAILABLE TECHNOLOGY (ICAO Study)
COSTSIMPACT
ONDOC( % )
0 1 2 3 4
NOISE REDUCTION ( EPNdB )
+5
+4
+3
+2
+1
0
APPROACH
SIDELINE
FLYOVER
Technology Evaluator - Cost / Benefit Evaluation
Reference Data - ANDES Study
SILENCE(R)
page 10Aero Days 2006 - Vienna Eugène Kors - Snecma
CFD analysis
Inlet plane
Three Stage Low-pressure TurbineTest case
� High Speed Compressor : Computational Fluid Dynamics simulations to identify potentials of noise reducti on in a High Speed LPC of an Aero Engine
SILENCE(R)
page 11Aero Days 2006 - Vienna Eugène Kors - Snecma
Low Noise Compressor for UHBR engines
� CFD based design
� Back –to- back testing on compressor rig
� Modal analysis techniques
� 1 BPF tone reduction by 8 dB
� No performance penaltiesBaselineconfiguration
Low noiseconfiguration
Inlet Guide VaneStator 1
New vanes
Baselineconfiguration
Low noiseconfiguration
Inlet Guide VaneStator 1
New vanes
SILENCE(R)
page 12Aero Days 2006 - Vienna Eugène Kors - Snecma
0-Splice liner
� Research supported by several prototypes tested in various facilities.
� Follow-on industry test demonstrated clear benefit
� Zero Splice technology is applied on A380/Trent 900
1BPF fieldshape at 80% N/RT (fan rig)
60
70
80
90
100
0 20 40 60 80 100
Angle (degrees)
SP
L (
dB)
10dB
Forward arc PWL at 1BPF (fan rig)
50 60 70 80 90 100
% N/RT
PW
L (d
B) 10dB
2 splices
ZSI
2 splices
ZSI
1BPF fieldshape at 80% N/RT (fan rig)
60
70
80
90
100
0 20 40 60 80 100
Angle (degrees)
SP
L (
dB)
10dB
1BPF fieldshape at 80% N/RT (fan rig)
60
70
80
90
100
0 20 40 60 80 100
Angle (degrees)
SP
L (
dB)
10dB
Forward arc PWL at 1BPF (fan rig)
50 60 70 80 90 100
% N/RT
PW
L (d
B) 10dB
Forward arc PWL at 1BPF (fan rig)
50 60 70 80 90 100
% N/RT
PW
L (d
B) 10dB
2 splices
ZSI
2 splices
ZSI
SILENCE(R)
page 13Aero Days 2006 - Vienna Eugène Kors - Snecma
ACTIVE
PASSIVE
cut-off frequency : 1700 Hz
HYBRID FUNCTIONING : active at low frequencies, passive at high frequencies
Distance plate-wiremesh
10 mm
17 mm
High attenuation levels over a large frequency range
Flow velocity : 10 m/s
Frequency (Hz)Frequency (Hz)
TL
(dB
)
hybrid passive/active absorber
Microphone
Wire mesh
Piezo-ceramicactuator
SILENCE(R)
page 14Aero Days 2006 - Vienna Eugène Kors - Snecma
Exhaust Nozzle Treatement
� CFD design
� Model tests for down-selection
� Flight test for full scale validation
SILENCE(R)
page 15Aero Days 2006 - Vienna Eugène Kors - Snecma
Exhaust Plug Designs
� Multiple Light-weight designs
� Down-selection process for best performance
� Manufacturing for full-scale validation
SILENCE(R)
page 16Aero Days 2006 - Vienna Eugène Kors - Snecma
Active Technologies applied to Fan Tone Reduction
Potential Fan Tone Reduction based on Small Scale model test
Hardware for
Large Scale
model test
Source: Snecma, EADS/CRC
8 dB BPF reduction achieved
SILENCE(R)
page 17Aero Days 2006 - Vienna Eugène Kors - Snecma
Development of Aeroacoustic test means
� Hot Stream Liner Test Facility
• Rig specifications:
- Mach 0.4
- Temperature 550 °C
- SPL 140 dB
- Insertion loss and in-situ acoustic impedance measurements in the frequency range between 0.5 and 5 kHz
• 23 Liner Configurations Tested
Perforate type of liner, broadband random noise exc itation,T = 500°°°°C, M = 0.325
-2.5
-1.25
0
1.25
2.5
0 1000 2000 3000 4000 5000
R1
R2
X1
X2
Cav
Impedance
SILENCE(R)
page 18Aero Days 2006 - Vienna Eugène Kors - Snecma
Development of Aeroacoustic test means
Aeroacoustic test in F1 (treated section)
Rotating modegenerator
SILENCE(R)
page 19Aero Days 2006 - Vienna Eugène Kors - Snecma
Scarfed inlet
SILENCE(R)
page 20Aero Days 2006 - Vienna Eugène Kors - Snecma
Fan Case
TCS InletAcoustically Lined
Barrel
Large scale tests on Fan rig
Forward Mode Detection Ring
SILENCE(R)
page 21Aero Days 2006 - Vienna Eugène Kors - Snecma
Full Scale Validation Tests
Static Tests trough 2003-2006
Test facilities used for Rolls Royce and Snecma eng ines
SILENCE(R)
page 22Aero Days 2006 - Vienna Eugène Kors - Snecma
Full Scale Validation Tests� Flight Tests trough 2003- 2005
SILENCE(R)
page 23Aero Days 2006 - Vienna Eugène Kors - Snecma
Full scale demonstration tests
� A340 flight test in 2003 including LG fairings & wi ng add-on treatments
Outer wheel caps(M-D)
Lower articulation link(AUK)
Dragstay Door legfiller (M-D)
Upper articulationlink (AUK)
Undertray
(AUK)
Upper side stay(AUK)
Gap filler (M-D)
MLG SET n°1
MLG SET n°2
PNLT (TPNdB)
30 60 90 120 150
PHI (°)
Low noise Baseline
1dB
1.8 EPNdB reduction on (LG) aerodynamic noise
0.4 EPNdB reduction on Approach Noise incl. Low Noi se solutions on High Lift devices (max. weight / max. flap)
SILENCE(R)
page 24Aero Days 2006 - Vienna Eugène Kors - Snecma
Advanced NLG Low Noise Design Features
Advanced Low Noise NLG:Original A340 NLG
� Deployable ramp type spoiler to protect upper leg area and bay doors
� Inverted steering mechanism(now located in the bay)
� Tow-bar rotated to the rear (located in low speed leg wake)
� Upstream installed torque link with fairing (to protect main leg)
� No lights on the gear, inner and outer hub caps,wheel/ tyre rim in-fills
SILENCE(R)
page 25Aero Days 2006 - Vienna Eugène Kors - Snecma
Advanced MLG Low Noise Design Features
Advanced Low Noise MLGOriginal A340 MLG
� Telescopic side-stay to replace- folding stay with
down lock mechanism- retraction actuator- hinged door
� Streamline leg door fairing
� Upstream installed torque link with fairing, no articulation link needed (0°bogie inclin.)
� Bogie front fairing, brake fairing , hub caps and wheel/ tyre rim in-fills
SILENCE(R)
page 26Aero Days 2006 - Vienna Eugène Kors - Snecma
Advanced NLG and MLG Noise Testing in DNW-LLF
Nose Landing Gear Main Landing Gear
102
103
-10
-8
-6
-4
-2
0
2
4
6
8
10Noise reduction relative to Baseline A340 GEAR
Frequency (Hz)
∆ dB
predictedmeasured
102
103-10
-8
-6
-4
-2
0
2
4
6
8
10Noise reduction relative to Baseline A340 GEAR
Frequency (Hz)
∆ dB
predictedmeasured
NLG MLG
Noi
se r
educ
tion
in
∆∆ ∆∆dB
Noi
se r
educ
tion
in
∆∆ ∆∆dB
Frequency [Hz] Frequency [Hz]
MeasurementPrediction
MeasurementPrediction
SILENCE(R)
page 27Aero Days 2006 - Vienna Eugène Kors - Snecma
Thank Youfor
Your Attention
Recommended