Proyecto de Investigación: MULTIDISCIPLINARY APPROACH FOR THE IMPLEMENTATION OF NEW TECHNOLOGIES TO PREVENT ACCRETION OF ICE ON AIRCRAFTS
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RTI2018-096262-B-C41
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Design Process and Advanced Manufacturing of an Aquatic Surface Vehicle Hull for the Integration of a Hydrogen Power Plant Propulsion System
(Multidisciplinary Digital Publishing Institute (MDPI), 2024-02-01) Renau Martínez, Jordi; García Peñas, Víctor; Ibáñez Arnal, Manuel; Giménez Sancho, Alberto; López González, E.; García-Magariño, Adelaida; Terroba, Félix; Moreno Ayerbe, Francisco Javier; Sánchez López, Fernando; Ministerio de Ciencia e Innovación (MICINN)
This article presents the design and manufacturing of a hydrogen-powered unmanned aquatic surface vehicle (USV) hull. The design process comprised three stages: (1) defining the requirements for a preliminary geometry, (2) verifying the hydrodynamic hull performance using computational fluid dynamics (CFD) simulations, and (3) experimentally validating the hydrodynamic hull performance and CFD analysis results through experimental fluid dynamics in a calm water towing tank. The manufacturing process utilized additive manufacturing technologies, such as fused granular fabrication and selective laser sintering, to produce the hull and other components, including the propeller and the rudder; thermoplastic materials with carbon fiber reinforcement were employed. The experimental results demonstrate that the optimized trimaran hull exhibited low hydrodynamic resistance (7.5 N), high stability, and a smooth flow around the hull (up to 2 m/s). The design and manufacturing of the USV hull met expectations from both hydrodynamic and structural perspectives, and future work was outlined to integrate a power plant, navigation system, and scientific equipment.
Novel design of superhydrophobic and anticorrosive PTFE and PAA + β − CD composite coating deposited by electrospinning, spin coating and electrospraying techniques
(Multidisciplinary Digital Publishing Institute (MDPI), 2022-10-16) Vicente, Adrián; Rivero, Pedro J.; Urdiroz, U.; García Gallego, Paloma; Mora Nogués, Julio; Palacio, J. F.; Palomares, F. J.; Rodríguez, Rafael; Asociación de la Industria Navarra (AIN); Agencia Estatal de Investigación (AEI)
A superhydrophobic composite coating consisting of polytetrafluoroethylene (PTFE) and poly(acrylic acid)+ β-cyclodextrin (PAA + β-CD) was prepared on an aluminum alloy AA 6061T6 substrate by a three-step process of electrospinnig, spin coating, and electrospraying. The electrospinning technique is used for the fabrication of a polymeric binder layer synthesized from PAA + β-CD. The superhydrophilic characteristic of the electrospun PAA + β-CD layer makes it suitable for the absorption of an aqueous suspension with PTFE particles in a spin-coating process, obtaining a hydrophobic behavior. Then, the electrospraying of a modified PTFE dispersion forms a layer of distributed PTFE particles, in which a strong bonding of the particles with each other and with the PTFE particles fixed in the PAA + β-CD fiber matrix results in a remarkable improvement of the particles adhesion to the substrate by different heat treatments. The experimental results corroborate the important role of obtaining hierarchical micro/nano multilevel structures for the optimization of superhydrophobic surfaces, leading to water contact angles above 170°, very low contact angle of hysteresis (CAH = 2°) and roll-off angle (αroll−off
< 5°). In addition, a superior corrosion resistance is obtained, generating a barrier to retain the electrolyte infiltration. This study may provide useful insights for a wide range of applications
