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  • 1
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    MDPI - Multidisciplinary Digital Publishing Institute
    Publication Date: 2024-04-11
    Description: Wind turbine aerodynamics is one of the central subjects of wind turbine technology. To reduce the levelized cost of energy (LCOE), the size of a single wind turbine has been increased to 12 MW at present, with further increases expected in the near future. Big wind turbines and their associated wind farms have many advantages but also challenges. The typical effects are mainly related to the increase in Reynolds number and blade flexibility. This Special Issue is a collection of 21 important research works addressing the aerodynamic challenges appearing in such developments. The 21 research papers cover a wide range of problems related to wind turbine aerodynamics, which includes atmospheric turbulent flow modeling, wind turbine flow modeling, wind turbine design, wind turbine control, wind farm flow modeling in complex terrain, wind turbine noise modeling, vertical axis wind turbine, and offshore wind energy. Readers from all over the globe are expected to greatly benefit from this Special Issue collection regarding their own work and the goal of enabling the technological development of new environmentally friendly and cost-effective wind energy systems in order to reach the target of 100% energy use from renewable sources, worldwide, by 2050
    Keywords: TA1-2040 ; T1-995 ; simplified free vortex wake ; n/a ; H-type VAWT ; variable pitch ; wind tunnel experiment ; rotor blade optimization ; Non-dominated Sorting Genetic Algorithm (NSGA-II) ; wake effect ; wind turbine noise propagation ; RANS ; axial steady condition ; wind turbine blades ; optimization ; computational fluid dynamic ; straight blade ; typhoon ; gradient-based ; image processing ; actuator line method ; piezo-electric flow sensor ; stall ; turbulence ; airfoil design ; vortex ring ; defects ; DMST model ; wind turbine design ; S809 airfoil ; dynamic fluid body interaction ; Computational Fluid Dynamics ; ABL stability ; semi-submersible platform ; random search ; floating offshore wind turbine ; blade length ; adjoint approach ; Fatigue Loads ; wind turbine optimization ; wind turbine airfoil ; particle swarm optimization ; rotational augmentation ; NREL Phase VI ; mechanical performance ; coupling of aerodynamics and hydrodynamics ; tip speed ratio ; aerodynamics ; oscillating freestream ; super-statistics ; blade element momentum theory ; wind turbine ; wind energy ; boundary layer separation ; wind turbine blade optimization ; actuator disc ; dynamic stall ; complex terrain ; laminar-turbulent transition ; SCADA ; OpenFOAM ; atmospheric stability ; computational fluid dynamics ; economic analysis ; OC5 DeepCWind ; wind tunnel ; actuator disk ; meso/microscale ; cost of energy ; power coefficient ; pitch oscillation ; condition monitoring ; aerodynamic characteristics ; blade parametrization ; wind turbine wakes ; truss Spar floating foundation ; wind resource assessment ; wind shear ; wind turbine noise source ; design ; low wind speed areas ; aerodynamic ; wind farm ; met mast measurements ; turbulent inflow ; VAWTs (Vertical axis wind turbines) ; thermography ; wind speed extrapolation ; MEXICO ; wind turbine wake ; aerodynamic force ; layout optimization ; H-type floating VAWT ; LES ; NACA0012 ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TB Technology: general issues::TBX History of engineering and technology
    Language: English
    Format: application/octet-stream
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  • 2
    ISSN: 1572-879X
    Keywords: methanol synthesis ; palladium supported on ceria ; cationic palladium ; ultrafine Pd particle ; EXAFS of Pd ; XPS of Pd 3d
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Ceria‐supported palladium catalysts prepared by the deposition–precipitation method are highly active for the methanol synthesis from carbon monoxide and hydrogen in comparison with the catalyst prepared by the conventional impregnation method. Analyses by EXAFS show that palladium particles can be dispersed very well on the surface of ceria by both the methods, implying that the higher activity of the catalysts prepared by deposition–precipitation is not simply due to the particle size of palladium. Cationic palladium species are present in the samples prepared by deposition–precipitation after reduction with hydrogen at 300 °C, suggesting that the active species are produced by strong contact between palladium particles and the support.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of polymer research 1 (1994), S. 211-214 
    ISSN: 1572-8935
    Keywords: Polyarylate ; Bisphenol-A ; DCDPS ; IPA ; TGA ; Thermal degradation ; Lifetime
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Polyarylates were prepared from direct polycondensation of aromatic dicarboxylic acid such as 4,4'-dicarboxy diphenyl sulfone (DCDPS), isophthalic acid (IPA), and bisphenol-A (SPA) by means of ptoluenesulfonyl chloride and DMF in pyridine. We used thermogravimetric analysis to investigate the thermal decomposition of polyarylates and to determine kinetic parameters such as activation energy, preexponential factor and reaction order. Such information is useful for quick estimation of polymer lifetimes. Polyarylate derived from DCDPS-BPA has a longer lifetime than DCDPS/IPA-BPA or IPA-BPA at any given temperature, indicating that the former has better thermal stability than the latter.
    Type of Medium: Electronic Resource
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