Progress in enigne noise reduction and future challenges · The information in this document is the...
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Rolls-Royce Proprietary Information Trusted to deliver excellence © 2016 Rolls-Royce plc The information in this document is the property of Rolls-Royce plc and may not be copied or communicated to a third party, or used for any purpose other than that for which it is supplied without the express written consent of Rolls-Royce plc. This information is given in good faith based upon the latest information available to Rolls-Royce plc, no warranty or representation is given concerning such information, which must not be taken as establishing any contractual or other commitment binding upon Rolls-Royce plc or any of its subsidiary or associated companies. TotalCare ® is a registered trademark, Life ® , Term ® and Flex ® are registered in the European community. Trent ® is a registered trademark. Progress in Engine Noise Reduction and Future Challenges Joe Walsh CEng FRAeS Rolls-Royce Associate Fellow – Noise Engineering Greener by Design Conference 17-18 October 2016
Transcript of Progress in enigne noise reduction and future challenges · The information in this document is the...
Rolls-Royce Proprietary Information
Trusted to deliver excellence
© 2016 Rolls-Royce plc
The information in this document is the property of Rolls-Royce plc and may not be copied or communicated to a third party, or used for any purpose other
than that for which it is supplied without the express written consent of Rolls-Royce plc.
This information is given in good faith based upon the latest information available to Rolls-Royce plc, no warranty or representation is given concerning
such information, which must not be taken as establishing any contractual or other commitment binding upon Rolls-Royce plc or any of its subsidiary or
associated companies.
TotalCare® is a registered trademark, Life®, Term® and Flex® are registered in the European community. Trent® is a registered trademark.
Progress in Engine Noise
Reduction and Future Challenges
Joe Walsh CEng FRAeS
Rolls-Royce Associate Fellow – Noise Engineering
Greener by Design Conference 17-18 October 2016
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Sources of aircraft noise
Relative importance depends on design and operating condition
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Sources of engine noise
Optimisation at
systems level
3
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Noise Trends in Large Engine Design
Typical early design Typical contemporary design
4
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Modern engines are significantly quieter
-35
-30
-25
-20
-15
-10
-5
0
1985 1990 1995 2000 2005 2010 2015 2020
Nois
e(c
um
ula
tive E
PN
dB r
ela
tive t
o C
hapte
r 3 lim
it)
Entry into Service (date)
74
7
RB
21
1-5
24
G
77
7 T
ren
t 8
00
A3
40
Tre
nt
50
0
A3
80
Tre
nt
90
0
78
7Tr
ent
10
00
A3
50
XW
B
Tre
nt
XW
B
No
ise
Red
uct
ion
Chapter 3
Chapter 4
Chapter 14
>55T <55T
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Advanced, low
speed fan
Spliceless
fan-case liner- maintaining a smooth
acoustic environment
Advanced, swept OGV- re-phasing sound field for noise
reduction
Advanced LP Turbine- containing tones within the
turbine
Spliceless intake liner- technology cooperation
with airframers
Maximised & optimised
acoustic liners
Rotor assembly
process
Noise reduction on a Trent engineEngine cycle selection
Integrated with other engine design requirements
Handling bleed
silencing
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Flightpath 2050 sets challenging goals7
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ALPS Advanced Low
Pressure SystemAdvance3 Core
Advance 1
Core Demo
EFE Environmentally
Friendly Engine
UltraFan™
ALECSYS Advanced Low
Emissions Combustion System
Noise UTC University
Technology Centre
Noise design
optimisation
High power noise
computing
Developing new noise technologies8
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Outdoor test facility
Engine inlet sits inside 32’ diameter sphere to simulate flight conditions
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Novel inlet
geometries
and lip
linersFan system and acoustic liner design
coupled with nacelle design using
advanced aerodynamic analysis
Noise technologies for future engines
Optimised close
coupled nacelle
/ exhaust /wing
installation
Cycle
optimisation of
fan speed and
jet velocities
Variable
area nozzle
UltraFanTM
Turbine
technologies
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Environmental trades11
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Sustainable Aviation Noise Roadmap 201312
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Technology is an important part of the solution
• All elements of ICAO
balanced approach are
important
- aircraft and engine technology
- operational improvements
- land use planning
- operational restrictions
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Relentless pursuit of improvements
Based on a clear understanding of future
requirements and trends
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Vision 20 and beyond
Better power for a changing world
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Summary
• Significant progress has been made in reducing
engine noise
• Ambitious targets have been set for further
noise reductions
• Comprehensive research programmes are
underway to develop new noise technologies
• Engine source noise reduction will continue to
be a key element in controlling aircraft noise
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