Setting a comprehensive strategy to face the runback icing phenomena
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- European Commission/Horizon 2020 Framework Programme/899352/
- AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-109603RA-I00/ES/
- AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-110430GB-C21/ES/
- AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/RTI2018-096262-B-C44/ES/
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Abstract
The development of anti-icing robust surfaces is a hot topic nowadays and particularly crucial in the aeronautics or wind energy sectors as ice accretion can compromise safety and power generation efficiency. However, the current performance of most anti-icing strategies has been proven insufficient for such demanding applications, particularly in large unprotected zones, which located downstream from thermally protected areas, may undergo secondary icing. Herein, a new testing methodology is proposed to evaluate accretion mechanisms and secondary icing phenomena through, respectively, direct impact and running-wet processes and systematically applied to anti-icing materials including commercial solutions and the latest trends in the state-of-the-art. Five categories of materials (hard, elastomeric, polymeric matrix, SLIPS and superhydrophobic) with up to fifteen formulations have been tested. This Round-Robin approach provides a deeper understanding of anti-icing mechanisms revealing the strengths and weaknesses of each material. The conclusion is that there is no single passive solution for anti-ice protection. Thus, to effectively protect a given real component, different tailored materials fitted for each particular zone of the system are required. For this selection, shape analysis of such a component and the impact characteristics of water droplets under real conditions are needed as schematically illustrated for aeronautic turbines.
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