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

By Peter Auer (Auth.)

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Shepherd provides a ready means of changing the pressure drop, but does not give any residual swirl which might occur with a turbine. 93, with the last named defined as the total pressure drop Lpt across the screen divided by the dynamic head at screen inlet, qt. , r = Δρ(VVif^ooKo. 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.

D = D{y). The experimental approach was then to visualize and photograph the flow and measure Ds for a given geometry. The test values of D as a function of y are given by van Holten and show excellent correlation with the theory. Now most of the above summary analysis is valid for shrouds and tip vanes and hence the crux of van Holten's design is the relative size and cost of the two concepts. 002A S, a very striking potential reduction of area, hence of material and cost. However, because the tip vanes are rotating, their drag decreases the ideal power gain and both indirect drag and viscous drag have to be considered.

10) Figure 27 (from Loth, 1975) shows the trailing vortex system from a wing. The bound vortex providing the lift of the wing continues as trailing #MAX Fig. 27. ) SEMSfttN WING Vortex-type concentrator—trailing edge vortex arrangement. (From L o t h , Wind Power 43 V 0 l N UNITS OF V 0 M AX P - P « I N UNITS OF \ 2 Fig. 28. ) pVjβ MAX Vortex-type concentrator—trailing edge vortex fluid pattern. (From Loth, vortices from the wing tips and the low pressure in these vortices is proportional to the square of the wing lift coefficient.

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