Download Advances in Energy Systems and Technology. Volume 1 by Peter Auer (Auth.) PDF

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By Peter Auer (Auth.)

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Three major investigations have been undertaken and significant analyses published in the last few years, two of them using flow regimes naturally occurring around particular shapes of surface (Loth, 1975, 1977; Walters, 1975; Sforza, 1977) and one by designing for a particular vortical arrangement (Yen, 1977). The ideas of Loth and Sforza are occasioned by the vortices associated with airfoil profiles providing lift, the former by utilizing the trailing vortex at the tip of a wing section and the latter using the vortex formed by flow separation from sharp, highly swept-back delta-type planforms.

Values of r up to about 2 were obtained and the optimum area ratio was just under 3. 60 were obtained, with each configuration yielding a maximum value at a particular area ratio. This is a critical parameter for optimization. The number, size, and arrangement of diffuser segments and the characteristics of the main (inner) slot and auxiliary slots all have a bearing on the overall performance and also on the final cost balance, with possible tradeoffs between necessary turbine size, diffuser first cost and output, but it is not possible to make a sufficiently succinct summary here.

Augmentation. The gain in power ΔΡ/Ρ is ί Δ VW», which is greater then the gain from increased mass flow alone. , less than the value of one-third of the simple axial momentum analysis and there is an added diffusional effect, as observed for ring-wing shrouds. The next step is to obtain a relation between Δ V/V«, and the magnitude and distribution of the applied radial forces, in order to estimate a power output from the geometry of the shroud or tip vanes. This requires a calculation of two coefficients a and β depending upon the distribution of vorticity connected with the shroud or tip vanes.

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