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ETRIOLLA Report Summary

Project ID: 323460
Funded under: FP7-JTI
Country: Germany

Periodic Report Summary 2 - ETRIOLLA (Experimental TRansonic Investigations On Laminar flow and Load Alleviation)

Project Context and Objectives:
The project tackles the CfP JTI-CS-2012-1-GRA-02-019. Within the project a Wind-Tunnel-Model is designed, built and tested that is capable of being tested with two main purposes:
- assess the extent of laminarity on the wing
- evaluate the performance of LC&A system in the trailing edge of the wing
In order to do this the project tackles different points:
- A model design is performed that creates a wind-tunnel model with an elastic behaviour comparable to the full-scale wing. This model is as big as possible, although fulfilling all specifications in terms of wind-tunnel restrictions (size, maximum force) in order to allow a high Reynolds-Number and therefore allow to assess the laminar extend on the wing during the tests in a way that the results are comparable to the full-scale tests.
- A first possible LC&A solution which is input to the project is evaluated, optimized and compared with a solution that was newly designed and optimized within the project. The best solution is scaled down to model scale and implemented into the model.
Before testing the model-wing a ground-vibration test is performed in order to show that the model can be operated safely in the wind-tunnel.
Within first WT test phase steps/ gaps and contaminants will be introduced into the model in order to evaluate the stability of the laminar behaviour with respect to these parameters.
In the second test-phase the LC&A devices settings and their effect on L/D are tested in order to modify and optimize the load-distribution on the wing.

Project Results:
During RP2 (05/2014 – 05/2016) the focal point of work was in WP 3 with model design and manufacturing activities. Further preparation work has also been performed in WP 4 (static and dynamic WT tests) and WP 5 (WT test plan)
WP 3 Wing WT Model Mechanical Design and Manufacturing
Parallel to design and manufacturing activities of the WT model smaller (detail) demonstrators have been developed and tested in order to ensure the flap actuation is working fine under load on a bended wing with different deformations. The flap demonstrator allowed also to test and optimize the remote control system for the flap actuation and to test the measurement system (hardware and software) for the model instrumentation (i.e. force-, temperature and other measurements) on the model.
For the Etriolla WT tests the IBK internal measurement software has been developed further from simple measurement procedures to complex measurement procedures with synchronous result logging for a large number of sensors by parallel monitoring and controlling the actuator settings.
Further activities have been performed for model storage and transportation – i.e. a design of a trolley that fits with WT model and according equipment into a standard container. Special challenges have been the different conditions to load/ unload the model by taking into account limitations of height (bridges on the way, gateway dimensions), space available to load, unload and store the model, crane capacities in different labs and so on.
The remaining design activities have been finished in RP 2 with close interaction to manufacturer (optimising schedule and use of machine features). Design and manufacturing activities have been performed in parallel to safe time.
The manufacturing of some parts had already been started in RP1 and have been proceeded in RP2.
During manufacturing occurred a machine failure on the most important machine which was needed to manufacture a lot of model parts. Unfortunately the machine could not be replaced by another machine in order to continue the manufacturing process. To minimize the impact of the machine failure on the project, different approaches have been investigated - for example to simplify parts (which needed some redesign and recalculation) and manufacture them on other machines. At the end all attempts to repair the machine failed and it was not possible to overcome the situation. This lead finally to a declaration of the manufacturer REVOIND to leave the consortium.
WP 4 Static and dynamic ground vibration tests
For the WP 4 (Static and dynamic ground vibration test) preliminary work has started. Some virtual models have been developed and updated according to the design progress for virtual testing in order to come along with design process and detect possible critical issues as early as possible.
WP 5 Wind-Tunnel Tests
In WP 5 a preliminary WT test plan has been developed and updated/ detailed according to project progress. There was also a close interaction with the WT team to setup a control and measurement concept to the WT test campaign.

Potential Impact:
Expected final results
As result a large scale laminar wing demonstrator (TLR 5) is expected. It is also expected that the optimisation of LC&A devices will show a positive effect by further improving L/D relation.
Expected impacts
Regarding JTI-Cleansky this project will help solving important questions about natural laminar flow and its applications on GRA-wings as well as the performance of LC&A systems. On an international level this increases Europe’s competitiveness in natural laminar flow applications as well as LC&A systems on regional aircrafts. Both technologies (NLF and LC&A design) lead to reduced fuel burn by
o Reducing drag (NLF)
o Reducing weight (LC&A)
and the impacts are therefore in line with the ACARE-goals.

Apart from a national level each partner that contributes to the project has several advantages:
• Insight into high fidelity test results for an advanced technology aircraft wing
o A reference project that shows competence on an international level by winning the call for project against competitors as well as successfully working together as a multi-disciplinary team
• All partners in the consortium have the opportunity to further increase their know-how. In case of the SMEs this can be further exploited by transferring IP generated in this project into industrial applications. All consortium members have extended their competence in their field of work.
• One university is present in the consortium; members of FOI and IBK are giving lectures at universities, too. This allows transferring knowledge achieved in this project to future engineering generations.

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