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Read e-book online Advances in Energy Systems and Technology. Volume 1 PDF

By Peter Auer (Auth.)

ISBN-10: 012014901X

ISBN-13: 9780120149018

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However, the boundary layer separates just before the point of maximum velocity and the finite size of any work extraction device limits the actual attainable value of R to about 3 or less. Similarly to the simple actuator disk momentum analysis, the total available power cannot be extracted because this would require zero exit velocity and hence no through flow, so that with respect to the local velocity, the Betz limit still applies, although the overall effect has been enhanced by the increased inlet velocity (cf.

He takes into account bound vorticity as well as the wake vorticity and uses the Biot-Savart relationship for obtaining the induced velocities from both vortex sheets. His results show that the velocity induction effect is such that half the retardation takes place within the turbine itself and hence that blade incidence and aerodynamic loading are much higher on the windward side than on the leeward side. Wind Power 27 Other analyses do not show these unsymmetrical conditions. 545 at λ ~ 4 is obtained.

The maximum velocity at radius a is only about one-half of the ideal value. Loth 1977 analyses the augmentation by a vortex in the following manner. 11) This value for one chord length downstream of a wing tip is shown in Fig. 29. Then the concentration ratio is given by R = 1 + / Z , where Ζ is 44 D. G. I . 84 — - - ^ = Vortex core Viscous Outer j Region 06 ! 01 2 4 1111 6 810 1 1 1 111 111 1 20 4 0 6 0 100 2 0 0 1 _ l _ 500 TURBINE TO VORTEX DIAMETER RATIO - ^ j — Fig. 29. Vortex-type concentrator—rotational energy fraction.

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


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