simulation and modelling advances in the field of aero engines · pdf fileaerodynamics of...
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Trusted to deliver excellence
Simulation and Modelling Advances
in the Field of Aero engines
MATLAB EXPO 2013
Kevin Daffey
Global Head of Electrical Power and Control Systems
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An Introduction to Rolls-Royce
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Group profile
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Business model and strategy
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A consistent approach to business
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2012 financial highlights
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Civil aerospace
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Engine Facts and Figures 8
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How a Gas Turbine Works
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How a Gas Turbine Works
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How a Gas Turbine Works
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How a Gas Turbine Works
Intermediate Pressure Turbine
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Testing and Trials 13
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Fan Blade Off Certification Test 14
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Simulation in Design
• Rolls-Royce uses a wide variety of analysis techniques for
design verification from whole engine to component
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Finite element analysis is used for structural, vibration, lifing and thermo-mechanical analysis, both linear and non-linear at whole engine, component and sub-system level.
Computational fluid dynamics is used to understand the aerodynamics of engines in order to maximise performance.
Combined CFD and Structural analysis is used to study forced vibration on turbomachinery
Cost modelling is used to identify cost drivers and maximise value
Multi-disciplinary Whole Engine Design Systems predict the behaviour of the integrated product
Materials designed for required properties
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Mechanical Simulation 16
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Computational Fluid Dynamics 17
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Materials and Manufacturing Simulation 18
Complex Metal Crystal Casting
Predictable distortion & Machine System / Tooling
Predictable Forming (Minimised Material Use)
Filling and Solidification (Defect free castings)
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Product Cost Engineering
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Whole Engine Thermomechanical Modelling 20
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Examples of MATLAB Usage in RR
• System design teams use MATLAB SIMULINK to develop models, simulations
and prototypes of control systems;
• System verification teams use MATLAB to analyse large volumes of test data;
• MATLAB SIMULINK is used for the development and running of state-space, or
real-time, engine models (RTEM);
• MATLAB SIMULINK is used to create thermodynamic engine models (ARTEMIS);
• Post processing and visualisation of data generated from SCO3 thermal codes;
• MatLab Image Processor for thermal paint analysis data;
• Analysis of Engine Health Monitoring Data;
• Birdstike slice Calculations;
• Air flow transients in Bearings;
• Auto-code from SIMULINK for Development Engine Control Systems.
Extracted from RR Intranet Site on MATLAB Tool
Technical Limitations:
•None. It is infinitely capable, limited only by the users’ imaginations and the amount of memory in the
computer! It’s a bit slow though. I prefer Fortran & ES37.
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MATLAB uses in Electrical and Controls
• Dynamic modelling of
complex system
• Validation & verification
• Multi-system optimisation
• Design of complex systems
• Model-to-Code on development
hardware platforms
• Electrical Systems
• System design, power system
analysis, transient studies.
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FADEC 2
PMS VMS
Delegated
autonomy
Engine 2
FADEC 1
Engine 1
Electrical Power & Load System
GG
G
G
Simulation
Environment
Real World
Components
FADEC 2
PMS VMS
Delegated
autonomy
Engine 2
FADEC 1
Engine 1
GG
G
G
Simulation
Environment
Real World
Components
270VDC Primary Distribution System
FADEC 2
PMS VMS
Delegated
autonomy
Engine 2
FADEC 1
Engine 1
Electrical Power & Load System
GG
G
G
Simulation
Environment
Real World
Components
FADEC 2
PMS VMS
Delegated
autonomy
Engine 2
FADEC 1
Engine 1
GG
G
G
Simulation
Environment
Real World
Components
270VDC Primary Distribution System
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MATLAB uses in Electrical and Controls
• Control laws design
• Performance optimisation
• Software packages
integration
• MSL, SPAN/Simulink
• Multi-platform application
• Data processing and conditioning
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2
DT_out
1
exhaust_out
-u
neg
0.001
max area (of w130)
0.03
W30_offtake_for_cooling
ThotIn+TcoldIn
TColdOut
Product2
Product1
Product
PCE_Eff
1
Hot_to_Cold_Eff
DeltaThot
DeltaCold
5
valve_area
4
T130
3
W30
2
TB30
1
W130
T_hot<>T_hot<>
T130<>
eT
PCE_MF_Hot<>PCE_MF_Hot<>
<><>W130
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NASA image by Robert Simmon, using ALI data from the EO-1 team
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Photo by Craig Murphy
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Encountering An Ash Cloud
Some centrifuging
by fan
Handling
bleeds remove
some ash
Ash
cloud
© 2012 Rolls-Royce plc
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VA Gas Turbine Engine Damage Mechanisms
Compressor erosion – loss of efficiency and
surge margin.
Ash
cloud
Ash starts to melt in and around combustor
(clogging in combustor leading to flame
extinction)
Sulphidation of Ni alloys
in turbine
Molten ash sticks in turbine annulus, choking engine
Electronic control
systems affected
Lubrication system
contamination
Turbine cooling
systems block,
reducing component life
Ca sulphates can accrete in hot section months after eruption
(sulphur aerosols)
© 2012 Rolls-Royce plc
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Combustor
HP turbine blades
HP NGVs
© 2012
Rolls-
Royce
plc
Engine Damage Mechanism
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Ash Hazard - Factors 30
Eyjafjallajokull 2010. Photo: Brynjar Gauti,
DC-10 at Cubi Point Naval Air Station, Philippines
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© 2012
Rolls-
Royce
plc
Monitoring Solution – VAAC global coverage
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Monitoring Solution – VAAC Data 32
VOLCANO: EYJAFJALLAJOKULL 1702-02
PSN: N6338 W01937
VOLCANIC ASH CONCENTRATION: RED
MODEL RUN: 20100519/0600
VALIDITY TIME: 20100519/0600
FLIGHT LEVEL: SFC/FL200
REMARKS: MODEL DATA
Poly 1
N451118 E0051914
" "
N451118 E0051914
Poly 2
" "
" "
" "
" "
" "
Poly n
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Volcanic Ash Advisory from London 33
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Matlab Tool
Met Office data via Internet
(automatically downloaded
- daily)
Ash cloud Coordinates of
Grey, Black and Red Zones
Summary flight Data via
EHM SQL Database.
Standard Engine data
including aircraft ID, date-
time, city pairs,
corresponding airport
location and coordinates
Local
Database
SQL Query
On engine
exposure
Monitoring Solution – Data-flow 34
© 2012 Rolls-Royce plc
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Future of Air Travel could be Electric 35
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And finally, Voice of the Customer……
• Although MATLAB is used throughout Rolls-Royce it has to
continue to earn its place…..
• Cost of ownership is not just licenses, but includes the time to develop new
routines, deb-bug, execute, interpreting, configuration management, training and
updating people. MATLAB is there to save engineering costs, if it doesn’t save
us money in product development we will change;
• People - Graduates who use MATLAB products during their studies, come into
Rolls-Royce with varying levels of proficiency. It would be nice to have a future
state where all students are taught a basic level of proficiency that can be built
upon when in employment.
• Business Critical Decisions (technical and commercial) are often supported by
modelling scenarios. The providence of the model must meet the level of
criticality of the decision. With known levels of accuracy and limitations of the
model.
• Integration with other modelling tools and Model Based Systems Engineering
toolsets incorporating SysML is critical to helping Rolls-Royce remain
competitive. We will continue to push for integration, MATLAB is not a universal
tool for us, but part of a total suite of modelling and simulation tools..
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