Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Future of aircraft wings: movable leading edge with flexible skin and integrated functions

23.06.2015

What will aircraft wings need to achieve in the future? This is a question being researched by Fraunhofer as part of the European research programme Clean Sky - Green Regional Aircraft. The most recent result is a three-meter wide 1:1 climatic wind tunnel model of a possible future wing. The scientists have integrated several potential future technologies in this demonstrator, which is intended as a technology platform. These include a flexible droop nose (movable leading edge) with a measurement system, an ice-protection system fully functional under the high geometric variations of the Droop nose and synthetic jet as well as shape memory alloy actuators.

The 1:1 droop nose demonstrator was designed and manufactured at Fraunhofer Institute for Structural Durability and System Reliability LBF in Darmstadt and subsequently tested in a climatic wind tunnel under icing conditions. Based on aerodynamic and aero acoustic specifications, the scientists developed kinematics for deflecting the nose of the wing’s leading edge.


Droop nose demonstrator with movable leading edge and integrated trendsetting technologies.

Photo: Fraunhofer LBF, Darmstadt, Germany

The special feature of this high-lift device in the leading edge region is that it prevents gaps because the skin deforms with it. This is particularly important for future laminar wings as they can only be realized with smooth surfaces. Another expected advantage is reduced noise emissions during landing approach thanks to the lack of gaps. The extensive morphing of the skin, however, which occurs during every operation, necessitates adequate environmental loads performance and structural durability of the system.

An electromechanical actuator causes the skin to deform. In addition, the droop nose also uses several smart memory alloy actuators tested by Fraunhofer IBP. Fraunhofer LBF is developing a process for reconstructing the wing geometry based on sensor signals so that in the future it will be possible to enhance flight kinematics control, as well as proactively avoid forced misalignment, etc.

“Among other sensors, almost 50 fibre-optical strain sensors were integrated in the skin of the movable leading edge for this purpose, and routed to the outside via a newly developed, structurally integrated connector concept. The deep draft, extended conical composite nose design has offered relevant exploration settings in building to function”, explains Martin Lehmann, Fraunhofer LBF.

“Fraunhofer is also thinking to more (vehicle) usage liaised manufacture to be captured and tolerances self-sufficiently upheld, therefore departing somewhat from costly managed jig and correlated flight points design. We want more manufactured-in service and user benefit”, points out John Simpson, Fraunhofer Aviation.

Fraunhofer ENAS provided synthetic jet actuators for the “Wing” technology platform. These are able to exert a positive effect on the airstream. For the first time, Fraunhofer LBF additionally integrated a thermal ice protection system in a highly strained wing leading edge. The extensive deformation of the skin previously made it impossible to solve this design concept satisfactorily.

During the Clean Sky project, Fraunhofer LBF was able to develop a flexible heating system based on carbon nano tubes (CNT). Thermal sensors integrated in the model regulate the temperature. During initial testing of the model, there was good conformity in the wing deformations between the results of the FE simulations and the manufactured model.

The structure and the various technologies functioned well as expected, and Fraunhofer LBF was able to demonstrate the technology’s maturity level as a result of successful mechanical tests and environmental wind tunnel practice. Moreover the forced deformation supports ice-protection – a new pragmatic tested solution.

This new technology is the result of a large-scale research program part, dedicated to regional aircraft. The technology potential is not yet at an end and the plan is to continue activities in future projects. Fraunhofer sees the potential especially in distilling a lower mechanical and electrical energy balance while respecting the reliability of the system. Furthermore, application studies shall provide operational specification fundamentals for the next generation commercial exploitation. A global goal is the servicing of partners from the fields of manufacture to aero servo-elasticity.

Weitere Informationen:

http://www.lbf.fraunhofer.de/content/dam/lbf/de/documents/presse/Fraunhofer%20LB...

Anke Zeidler-Finsel | Fraunhofer-Institut für Betriebsfestigkeit und Systemzuverlässigkeit LBF

More articles from Power and Electrical Engineering:

nachricht Did you know that the wrapping of Easter eggs benefits from specialty light sources?
13.04.2017 | Heraeus Noblelight GmbH

nachricht To e-, or not to e-, the question for the exotic 'Si-III' phase of silicon
05.04.2017 | Carnegie Institution for Science

All articles from Power and Electrical Engineering >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Making lightweight construction suitable for series production

More and more automobile companies are focusing on body parts made of carbon fiber reinforced plastics (CFRP). However, manufacturing and repair costs must be further reduced in order to make CFRP more economical in use. Together with the Volkswagen AG and five other partners in the project HolQueSt 3D, the Laser Zentrum Hannover e.V. (LZH) has developed laser processes for the automatic trimming, drilling and repair of three-dimensional components.

Automated manufacturing processes are the basis for ultimately establishing the series production of CFRP components. In the project HolQueSt 3D, the LZH has...

Im Focus: Wonder material? Novel nanotube structure strengthens thin films for flexible electronics

Reflecting the structure of composites found in nature and the ancient world, researchers at the University of Illinois at Urbana-Champaign have synthesized thin carbon nanotube (CNT) textiles that exhibit both high electrical conductivity and a level of toughness that is about fifty times higher than copper films, currently used in electronics.

"The structural robustness of thin metal films has significant importance for the reliable operation of smart skin and flexible electronics including...

Im Focus: Deep inside Galaxy M87

The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.

Supermassive black holes form some of the most enigmatic phenomena in astrophysics. Their enormous energy output is supposed to be generated by the...

Im Focus: A Quantum Low Pass for Photons

Physicists in Garching observe novel quantum effect that limits the number of emitted photons.

The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...

Im Focus: Microprocessors based on a layer of just three atoms

Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.

Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Fighting drug resistant tuberculosis – InfectoGnostics meets MYCO-NET² partners in Peru

28.04.2017 | Event News

Expert meeting “Health Business Connect” will connect international medical technology companies

20.04.2017 | Event News

Wenn der Computer das Gehirn austrickst

18.04.2017 | Event News

 
Latest News

Wireless power can drive tiny electronic devices in the GI tract

28.04.2017 | Medical Engineering

Ice cave in Transylvania yields window into region's past

28.04.2017 | Earth Sciences

Nose2Brain – Better Therapy for Multiple Sclerosis

28.04.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>