By Peter Auer (Auth.)
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Extra resources for Advances in Energy Systems and Technology. Volume 1
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. ) and the optimum specific power becomes PoJA = MP Voc) (l + I A V A / . ) 2 for small AV/V. 3) or PovJPo = 1 + I A V / V . 4) where P0 is the ideal output of a simple turbine of the same area without 37 Wind Power ÛR Fig. 23. Tip vane-induced diffusion augmentor.
Fig. 20. Diffiiser-augmented turbine, boundary-layer control geometry. ) 34 D. G. 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.
2 1 . Diffuser-augmented turbine, ring-wing geometry. (From Igra, 1976a. Reprinted by permission from the American Institute of Aeronautics and Astronautics, A I A A paper 76-181, Fig. ) fore increase of yaw angle increases lift until the stall angle is reached. A shroud with flap has a better performance at zero yaw, but has a much smaller range of stall yaw angle. The augmentation ratior increases over a wide range of loading coefficient (turbine work) although it does reach a maximum, with the optimum value of loading coefficient being reduced with increase in shroud exit area.
Advances in Energy Systems and Technology. Volume 1 by Peter Auer (Auth.)