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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
Rolls-Royce Proprietary Information
Sources of aircraft noise
Relative importance depends on design and operating condition
2
Rolls-Royce Proprietary Information
Noise Trends in Large Engine Design
Typical early design Typical contemporary design
4
Rolls-Royce Proprietary Information
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
5
Rolls-Royce Proprietary Information
6
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
Rolls-Royce Proprietary Information
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
Rolls-Royce Proprietary Information
Outdoor test facility
Engine inlet sits inside 32’ diameter sphere to simulate flight conditions
9
Rolls-Royce Proprietary Information
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
10
Rolls-Royce Proprietary Information
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
13
Rolls-Royce Proprietary Information
Relentless pursuit of improvements
Based on a clear understanding of future
requirements and trends
14
Rolls-Royce Proprietary Information
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
16