sandia 2014 wind turbine blade workshop- standish
DESCRIPTION
Sandia 2014 Wind Turbine Blade Workshop- WestphalTRANSCRIPT
Restricted © Siemens AG 2014 All rights reserved.
Siemens Rotor R&D:An OEM Perspective
Siemens Energy, Inc. - Boulder, CO USA
2014-Aug-26 Restricted © Siemens AG 2014 All rights reserved.Page 2 Boulder Wind R&D
Motivation
Future of wind power requires reducing the LCOE from wind to be directly competitive with traditional energy sources without subsidies.
• Why wind? Why not wind?
Blades are a small fraction of the total cost, but generate 100% of the AEP, and produce the majority of the design-driving loads.
• Loads = Material = Cost
Nearly all advances in blade design and technology have resulted from the combined efforts between academia, research institutions, and industry!
• Innovation is collaborative!
2014-Aug-26 Restricted © Siemens AG 2014 All rights reserved.Page 3 Boulder Wind R&D
Agenda
Blade technology performance and validation:Laboratory Testing
• Structural testing• Aerodynamic wind tunnel testing• Aeroacoustic wind tunnel testing
Field Testing• Acoustic field-testing• Oil-flow visualization• Tuft Flow visualization• Aeroelastic deformations• NREL-SWP CRADA research turbine• Extreme gust event
Research areas of interest:
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Laboratory Testing & Validation
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Structural Testing
Coupon Level Simple substructure Full ScaleComplex substructureElement or Panel Level
Design TestingMfg.
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Aerodynamic Wind Tunnel Testing
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Acoustic Wind Tunnel Testing
35
40
45
50
55
60
65
70
100 1000 10000
SPL
[dB
A re
. 20e
-6 P
a]
Frequency [Hz]
Configuration 1 Configuration 2
Airfoil
Flow
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Field Testing & Validation
2014-Aug-26 Restricted © Siemens AG 2014 All rights reserved.Page 9 Boulder Wind R&D
Acoustic Field Testing
2014-Aug-26 Restricted © Siemens AG 2014 All rights reserved.Page 10 Boulder Wind R&D
Oil-Flow Visualization
2014-Aug-26 Restricted © Siemens AG 2014 All rights reserved.Page 11 Boulder Wind R&D
Tuft Flow Visualization
Attached flow Separated flow
Clean leading edge
Soiled leading edge
Vortexgenerators
2014-Aug-26 Restricted © Siemens AG 2014 All rights reserved.Page 12 Boulder Wind R&D
Tip-Root Blade Perspective
Two Go-Pro cameras facing inboard/outboard
Static load testing for g-loading
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ATB Deflection Validation
ImagingtargetsLeading edge
Trailing edge
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ATB Deflection Validation
Root strain gaugeImage-based flap defl.
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NREL-SWP CRADA Test Turbine
2014-Aug-26 Restricted © Siemens AG 2014 All rights reserved.Page 16 Boulder Wind R&D
NREL-SWP CRADA – 108m Rotor
2014-Aug-26 Restricted © Siemens AG 2014 All rights reserved.Page 17 Boulder Wind R&D
NREL-SWP CRADA – Highlights
2014-Aug-26 Restricted © Siemens AG 2014 All rights reserved.Page 18 Boulder Wind R&D
NREL-SWP CRADA – Highlights
• Pressure System• Validating key aero data (360 Airfoil
Polars, Vortex Shedding, Etc)
2014-Aug-26 Restricted © Siemens AG 2014 All rights reserved.Page 19 Boulder Wind R&D
NREL-SWP CRADA – Overspeed Event
Extreme Overspeed – January 13th 2014
Inflow• Wind Gust: 6m/s to 35 m/s over 6 seconds• Direction Change: 90 degrees
Turbine• RPM: 153% of nominal RPM (tip speed ~135 m/s!)• Yaw Change: 25 degrees over 7 seconds (0.5 deg/sec capability)• Overspeed triggered (Software & Hardware)
Measurement Systems Operational During Event• Standard load channels• Fiber Bragg Strains in Blade B• Pressure System in Blade C
2014-Aug-26 Restricted © Siemens AG 2014 All rights reserved.Page 20 Boulder Wind R&D
NREL-SWP CRADA – Overspeed Event
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Research Interests
2014-Aug-26 Restricted © Siemens AG 2014 All rights reserved.Page 22 Boulder Wind R&D
How Can Research Advance Industry?
Universities and research laboratories possess a wealth of knowledge, experience, and opportunity. However, direct cooperation, communication and collaboration with OEMs is rather limited.
• Improve interface between industry and the research community
• Openly share non-proprietary information on our challenges and our successes
• Maturing viable technologies to a higher degree to facilitate industry implementation
2014-Aug-26 Restricted © Siemens AG 2014 All rights reserved.Page 23 Boulder Wind R&D
Research Areas of Interest
Wind-Specific Materials Research• Failure under long-term enviromental exposure, multi-axial static and
fatigue, scaling relationships, improved resins for fatigue
Structural Modeling• Non-linear behavior during deformations, aero-structural
optimization (airfoils & planforms)
Blade Soiling• ~3-5% AEP impact!, Improved computationald and laboratory
modeling
Airfoil analysis methods for wind• Simulate VGs, flatback airfoils, trailing edge add-ons, multi-element,
etc.
Aeroacoustics• Simple, fast, robust, semi-empirical methods!
3D & Dynamic Effects• Improved 3D & dynamic corrections for BEM
Vortex Codes• Improved accuracy with realistic speed compared to BEM
Turbulence Modelling• Improved correlation between measurement and models
2014-Aug-26 Restricted © Siemens AG 2014 All rights reserved.Page 24 Boulder Wind R&D
Conclusion
Steps towards reducing wind power LCOE will require significant
contributions from both industry and the research community
• Increase communication & collaboration
• Improve our modeling tools & methods
• Improve our field-validation techniques
Solutions must be simple, robust, and cost-effective
• Mature promising technologies in a timely manner
2014-Aug-26 Restricted © Siemens AG 2014 All rights reserved.Page 25 Boulder Wind R&D
Acknowledgements
Many thanks to the SWP team and to NWTC for their continued support!
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Thank you for your attention!Any questions?