By Peter Auer (Auth.)
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Extra resources for Advances in Energy Systems and Technology. Volume 1
45 with these average values covering a wide range of tunnel velocities. Loth (1977) also describes a type of Darrieus rotor, Fig. 26, which he places in the energy concentrator category or at least as a type not subject to the theoretical Betz limit coefficient. He pictures it as a porous cylindrical obstruction to the wind which, especially for high-solidity rotors, will increase the wind speed for the blades operating near the maximum width, due to the blockage caused by the inner blades similar to the flow around a cylinder.
The ring-wing diffiiser previously discussed develops lift on the stationary shroud, with the reaction on the air deflecting the flow outward and providing rapid diffusion downstream. , the stationary shroud is replaced by rotating shroud segments, Fig. 23. Van Holten first shows that the time-averaged radial force and induced velocity due to discrete tip vanes is the same as for the model with a continuous ring-wing shroud and thus the resulting diffusion is the same. 2) Substituting this into Eq.
The analysis considers only a flattened oval (race course) type of track, with no power contribution being taken for the turns. , 1974), the aerodynamic analysis is minimal and the problem of the value of the interference factor a and the actual value of the flow velocity of the disk is not discussed. Several airfoils from the NACA series were investigated, with the ubiquitous 0012 type being selected for the detailed calculations, using corrections for finite aspect ratio. The system resistances are categorized as the two rolling resistances due to the vertical and horizontal forces on the track, a resistance due to track curvature, and an aerodynamic resistance.