IEA Wind TCP

The Operating Agents (OAs) support the task, ensuring the timely delivery of scope with the contribution from all partners, using project management practices. The scope includes fulfilling the OAs duties in accordance with the IEA Wind Implementing Agreement and related IEA Wind procedures. The scope includes:
WP1.1 Develop and maintain public website & Task collaborative platform for
participants.
Timeline: Website and data platform delivered in project month Mn#1 (2021/04/15).
Support work continues through the Task 4-year term (Mn#1 – 48).
WP1.2 Technical support to task participants to ensure review & quality of
deliverables (Mn#1 – 48).
WP1.3 External communications (Mn#1 – 48).
WP1.4 Preparation & chair of coordination meetings for all task participants, as
described in Section 6 (Mn#1 – 48).
WP1.5 Preparation & chair of webinars for dissemination, as described in Section 5
(Mn#1 – 48).
WP1.6 Reporting to IEA Wind Executive Committee.

The work package is divided into the following activities:
WP2.1 Definition of priority geographic areas for geospatial mapping of erosion potential.
Compile comprehensive meta-data regarding available hydrometeor data (e.g. rain, hail characteristics and co-availability of wind speeds) for assessing LEE with a particular focus on regions with major wind energy penetration. The deliverables will be a report & spreadsheet summarizing the meta-data. In the report we will document where there are sufficient & sufficient quality data available for parameters of crucial importance to characterizing LEE.
Timeline: Date format: Year/Month/Day and assumes a project start date of
2021/04/15.
• Mn#1: Finalize Spreadsheet formatting for metadata collection (deadline:
2021/05/15).
• Mn#2: Participants add metadata (deadline: 2021/06/15).
• Mn#3: ZOOM Meeting to discuss round-1 entries (approx. 2021/07/15).
WP leads regularize entries (deadline: 2021/08/15).
• Mn#4: Final round of additions (all participants) (deadline: 2021/08/15).
• Mn#5: ZOOM Meeting to assign to assign credibility/utility (Expert judgement)
for LEE potential (1 (very useful; all parameters available), 2 (moderately
useful; most parameters available) or 3 (least useful; key parameters
missing)) (approx. 2021/09/15).
• Mn#6-7: Generation of report & final spreadsheet as deliverables (deadline:
2021/11/14).
WP2.2 Identification of additional meteorological parameters for erosion.
Compile comprehensive meta-data regarding available data for additional parameters of importance to LEE – specific foci; wind blown dust, UV, occurrence of freezing rain, corrosive agents such as sea spray. The deliverables will be a report & spreadsheet summarizing the meta-data. In the report we will document where there are sufficient & sufficient quality data available for parameters of crucial
importance to characterizing LEE.
Timeline:.
• Mn#8: Finalize Spreadsheet formatting for metadata collection (deadline: 2021/11/15).
• Mn#9: Participants add metadata (deadline: 2021/12/15).
• Mn#10: ZOOM Meeting to discuss round-1 entries (approx. 2022/01/15). WP leads regularize entries (deadline: 2021/02/01).
• Mn#11: ZOOM Meeting to assign to assign credibility/utility (Expert judgement) for LEE potential (1 (very useful; all parameters available), 2
(moderately useful; most parameters available) or 3 (least useful; key parameters missing)) (approx. 2022/02/15).
• Mn#11-12: Generation of report & final spreadsheet as deliverables (deadline:2022/04/15).
Conduct comprehensive literature reviews and synthesize knowledge gained from projects in order to better characterize:
WP2.3 (i) hail, rain & dust climates in target areas
WP2.4 (ii) hydrometeor droplet size distribution as function of climate
WP2.5 Revisit data availability and quality for key meteorological
parameters of relevance to LEE.
Timeline:
• Mn#13-15: Focus on frequency of hail, rain & dust.
• Mn#16-20: Focus on hail & rain size distributions.
• Mn#21-25: Revisit data availability for major drivers of LEE (WP2.1 and 2.2) and where necessary update spreadsheet of meta-data
WP2.6 Develop a roadmap for a leading-edge erosion atlas including developing Recommended Practice (RP) for use of meteorological data for determining Leading Edge Erosion (LEE) classes
Timeline: Focus of activities during months 26-30.
WP2.7 Develop Recommended Practice (RP) for measurements of LEE drivers including metrology development and prospects for establishing ‘super sites’ for instrument testing and model V&V exercises.
Timeline: Focus of activities during months 31-40.
WP2.8 Advance methods to conduct model V&V exercises focused on LEE and improve modeling tools of key atmospheric properties
Timeline: Focus of activities during months 36-46.
Throughout the project the WP leaders will liaise with and exchange knowledge with:
• WP3: Wind turbine operation with erosion (WP2 co-lead responsible: Sara C Pryor) regarding availability of LEE operational data to refine study regions.
• WP4: Laboratory testing of erosion (WP2 co-lead responsible: Marijn Veraart) regarding key parameters of interest of LEE.

The work package is divided into the following activities:
WP3.1 Model to predict annual energy production loss based on blade erosion
class.
Develop a common model of aerodynamic performance loss due to leading edge roughness and erosion standardized classes. Quantification of performance degradation (loss of AEP) as a function of roughness and ‘erosion climate’.
Timeline: All work to be completed during year 1.
• Mn#1-2: Finalize workplan (deadline: 2021/03/01).
• Mn#2-3: Participants review past models and define requirements of new model.
• Mn#3: Define test data set(s) for new erosion model.
• Mn#3-4: Participants define model inputs and outputs.
• Mn#5: Participants build model(s)
• Mn#6: Participants compare model results if multiple models, or compare to past models.
• Mn#10: Draft erosion AEP model with report on usage.
WP3.2 Report on standardization of damage reports based on erosion observations.
Standardization of damage reports for validation of any erosion potential assessment and to allow effective integration of data from operators with laboratory derived estimates.
Timeline: All work to be completed during year 1.
• Mn#1: Finalize workplan (deadline: 2021/03/01).
• Mn#2-4: Participants collect example erosion reports and data (deadline: 2021/05/01).
• Mn#5: Participants draft erosion report categories (deadline: 2021/06/01).
• Mn#6: Participants draft erosion report standard (deadline: 2021/07/01).
• Mn#8: ZOOM Meeting to get feedback on standardized erosion reports (approx. 2021/09/15).
• Mn#10: Draft report on erosion damage report standardization.
WP3.3 Droplet impingement model for use in fatigue analysis.
Develop a standard model for droplet impingement, validated with wind tunnel experimental data.
Step 1: Characterization of aerodynamics for droplet impingement probability.
Activity: Develop a standard model for droplet impingement, validated with wind tunnel experimental data. Timeline: Focus of months 11-22.
WP3.4 Potential for erosion safe-mode operation.
Report describing potential for leading edge erosion safe mode operation. This report will be used for seeking participation from industry and research funders towards a coordinated project designed to assess viability and cost-benefit of leading edge erosion safe mode operation.
Timeline: Focus of months 23-34.
WP3.5 Accuracy of LEE performance loss model based on field observations (validation). Validation of performance loss model using wind tunnel and field observations. Carry out iterative aerodynamic loss benchmarks with model development and new wind tunnel testing for calibration and validation. Validation of complete performance loss model using probabilistic analysis of field observations. Adapt models to simulate high roughness values (up to P20).
Timeline: Focus of months 35-46.
• Mn#46: Report on the quantified accuracy of leading edge erosion performance loss model based on field observations. Validation cases will
include roughness values from low to severe roughness. (Report)

The work package is divided into the following activities:
WP4.1 Available technologies for lab test (report).
Production of a report on technologies available for the laboratory evaluation of erosion. The review aims at covering as much as possible of laboratory testing relevant for wt blade erosion, ranging from formulation and micro-structure over basic physical, chemical and mechanical properties to rain erosion resistance
• Rain erosion tests
• Impact tests
• Viscoelastic properties
• Fracture mechanics
• Fatigue
• Microstructure Characterization
• Aging
• …

Timeline: Focus of months 1-10. (deadline 2022/1/15)
WP4.2 Erosion failure modes in LE systems (literature review).
Literature review and partner experience document on failure modes associated to the erosion process. The task is divided in WP4.2a “Failure modes in laboratory testing”, running in parallel with WP4.1 and WP 4.2b “Failure modes on turbines in the field”. The work will be performed in alignment with WP3.2 and WP5.2.
Timeline: WP4.2a is focus of months 1-10. WP4.2b is Focus of months 11-16.
(deadline 2022/7/15)
WP4.3 Normalization of test substrates (recommended practice). Development of a recommended practice on the normalization of test substrates for rain erosion testing.
Timeline: Focus of months 17-22. (deadline 2023/1/15)
WP4.4 Pre-evaluation of test specimens (recommended practice).
Development of a recommended practice on the pre-evaluation of test specimens.
Timeline: Focus of months 23-28. (deadline 2023/7/)
WP4.5 Test data analysis, damage accumulation and VN curves
(recommended practice).
Scope is damage accumulation based on slice length, time between intervals and tip speed, data analysis and generation of VN curves. Work will be performed in alignment with WP5.3.
Timeline: Focus of months 29-34. (deadline 2024/1/15)
WP4.6 Simple mechanical test for screening of key parameters (report).
Laboratory simple mechanical testing and identification of indicative key parameters for pre-evaluation of erosion resistance. Work will be performed in alignment with
WP5.3.
Timeline: Focus of months 35-40. (deadline 2024/7/15)
WP4.7 Correlation between RET data and expected field service life (report and model).
Correlation model to read across laboratory erosion metrics to field erosion metrics.
Work will be performed in alignment with WP2.7.
Timeline: Focus of months 41-46. (deadline 2024/12/24)
WP4.8 Aging – unloaded and during testing (literature review and recommended practice).
Aging. Environmental and chemical aspects of degradation in unloaded condition (Aging ex-situ) and during testing (stress cycle induced chemical degradation).
Timeline: Focus of months 41-46. (deadline 2024/12/24)

The work package is divided into the following activities:
WP5.1 Damage models based on fundamental material properties.
Identify appropriate damage models for accumulative droplet impact erosion attending specific failure modes based on fundamental material properties. Define appropriate testing methodologies for the material properties defined as input parameters in the modelling. Work will be performed in alignment with WP2.8 and 3.3 (modelling
including droplet impingement aerodynamics and key atmospheric issues) and WP4.7 (modelling from RET Data)
Report 1 based on Literature Review: Identify lacks and drawbacks on state-of-theart erosion damage modelling techniques and corresponding material characterization including partner’s experiences.
Timeline: Focus Months 1-15. Deadline 2022/06/15
Report 2 based on alternative/complementary erosion damage model studies
including partner’s experiences.
Timeline: Focus Months 16-42. Deadline 2024/09/15
WP5.2 Multilayer systems
Consider the leading edge as a multilayer system, and the different modelling approaches (in relation with 5.1). Appropriate analysis for Manufacturing issues due to LEP configuration, application procedure, LEP blade integration technology.
Report 1 based on Literature Review: LEP multilayer technology and interface
modelling methodologies.
Timeline: Focus months 10-21. Deadline 2022/12/15
Report 2 based on alternative/complementary interface damage mechanisms studies and related modelling techniques including partner’s experiences.
Timeline: Focus Months 22-36. Deadline 2024/03/15
WP5.3 Microstructure and macroscopic material properties Connecting the observed macroscopic mechanical behavior with the polymer
composition and microstructure. Investigating the effect of fillers, additives, polymer composition, on erosion mechanics and accumulation damage. To investigate testing techniques for polymer system analysis linked with the erosion damage progression. Report on the material microstructure and macroscopic material fundamental properties in relation with erosion performance.
Timeline: Focus months 1-45 Deadline 2024/12/15