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CORDIS - Forschungsergebnisse der EU

EUropean LOw Speed Aircraft Model at high Reynolds II

Periodic Reporting for period 2 - EULOSAM II (EUropean LOw Speed Aircraft Model at high Reynolds II)

Berichtszeitraum: 2020-04-01 bis 2021-01-31

The ambitious objectives set for the European aeronautical sector in the Horizon 2020 vision and the Clean Sky 2 programme require substantial decrease of the impact of the aviation on the environment. These include not only a 75% reduction in CO2 emissions, a 90% reduction in NOx, but also reduced noise and increased mobility of European citizens. It is believed, that meeting those goals will result in a greener aviation and will have a strong positive impact on the EU, as a knowledge based economy, leading to a development of a whole range of innovative technologies.
More in general, Clean Sky aimed at lowering pollutant emissions and reducing perceived external noise by integrating breakthrough technologies in full-scale demonstrators: engines, wings, embedded systems. Clean Sky2‘s objectives are however more than environmental as they address societal needs while enhancing mobility and achieve global competitiveness while strengthening European industrial leadership in aeronautics in Europe.
EULOSAM II will contribute to the achievement of Clean Sky 2 goals by providing support to CS2-AIR domain driven by Dassault Aviation by designing the experimental setup of a wind tunnel test campaign at High Reynolds numbers and low speed conditions. Dassault Aviation will test the WT model to identify at high Reynolds number, the behavior of innovative high-lift concepts adapted to a laminar wing. The outcome will provide results and knowledge for future comparison with other projects involving wind tunnel experiments, flight tests and computational results. This will let Dassault Aviation improve the procedure for the design of next generation aircraft by better predicting loads relevant conditions. Beyond relevant progress respect the current state of art, EULOSAM II is targeting to re-design an existing wind tunnel model to achieve innovative business aircraft configuration. The ambition in this phase is to adopt innovative design in order to minimize the manufacturing of new model components and therefore saving time and costs. This will also have a positive impact from an environmental point of view saving waste production and energy consumption.

The overall objective of the project is to support the development and assessment of natural laminar aircraft integrating innovative aerodynamic control surfaces, and High lift technologies. Within this context, the EULOSAM II project focuses on the modification and completion of a WT-model that allows analysing of the aerodynamic performance of innovative control surfaces and high-lift devices.
Main objectives of the project are:
- WT Model and Instrumentation design (starting point: EULOSAM project)
- HTP trim mechanism motorization design
- Verify the possibility to use additive layer manufacturing for an aerodynamic part (aileron) with pressure taps integrated
- Manufacturing of complete WT-Model
- WT-Model Assembly
- WT-Model Instrumentation (pressure taps, strain gauges, high frequency pressure transducers)
- WT-Model Acceptance Tests
The main activities performed during the project are:
- WT CAD model check and resolution of clashes between parts
- Identification of WT model configurations and part list for each configuration
- Feasibility study on additive layer manufacturing for an aerodynamic part (aileron)
- Design and manufacturing of samples to evaluate additive layer manufacturing technology
- Analysis and presentation of the results obtained from the samples in additive layer manufacturing
- Design of the HTP trim mechanism
- Design of the sealing concept (HTP-VTP and peniche)
- Design of the high frequency pressure transducers installation on the conventional/smart flaps
- Finalize the design of the complete WT Model
- WT-Model manufacturing
- WT-Model assembly
- WT-Model instrumentation
- WT-Model acceptance tests

The EULOSAM II WT model is ready for wind tunnel test activity !
EULOSAM II modified the existing left-hand-side half-wing wind tunnel model by updating the model instrumentation and by performing the design of the new wing components and landing gear with the aim to implement new concepts for improving the efficiency of the Wind Tunnel Testing.
Structural analyses to verify the integrity of the wind tunnel model under the aerodynamic loads were performed. Furthermore, the development of the Vertical ad Horizontal Tail plan trim mechanism was performed and tested.
The model was modified, designed, manufactured and qualitatively checked before the shipment to Dassault. Successively, the WT model will be installed and tested in a low speed high Reynolds wind tunnel, but these experimental tests are not part of this project.
EULOSAM II establishes a set of objectives that lead to a set of challenging results, which will have an impact at several levels, namely by:
1. Aircraft Design. The outcome will be fundamental for the application of the natural laminar flow technology to the next aircraft generation.
2. Aerodynamic Performance. The correct prediction of the high lift performance of a natural laminar aircraft equipped with new high lift devices (e.g. smart flaps, Krueger slats) will contribute to improve and increase the aerodynamic performance and efficiency, resulting in a positive ecological impact.
3. Improving the European industry competitiveness. The development of new techniques to speed up the wind tunnel testing for the correct prediction of the high lift performance will allow the design and testing of more efficient laminar aircrafts helping in the fulfilment of the ACARE goals, which are fundamental for all H2020 projects and will support the competitiveness of the European aeronautic industry.
4. Addressing two of the societal challenges established at the European level, namely the “Smart, Green and Integrated Transport”, mainly through the contribution towards more efficient aircrafts, and “Climate action, Environment, Resource Efficiency and Raw Materials”, mainly through the use of lighter aircraft requiring less energy.

In general, EULOSAM II will contribute to make the aircraft of new generation a competitive product indeed the laminar flow will allow to save friction drag a consequently reduce the whole aircraft drag of around 5% with a consequent reduction of the fuel consumption. These aspects have a reasonable impact in terms of direct and indirect costs, making the aircraft of new generation a competitive product. Furthermore, the laminar flow technology increase the aircraft fuel efficiency allowing to reduce the climate impact of aviation.

The expected impact of EULOSAM II lies within three major areas:
· Its impact on European competitiveness within the aeronautical arena;
· Society and Environment;
· A larger impact on innovation and knowledge integration.