By Peter Auer (Auth.)
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Additional resources for Advances in Energy Systems and Technology. Volume 1
8. Figure 42 shows very clearly that as VR increases so must WR9 and as it decreases, the rotor size, as D, must increase. The selected value of W€ affects the cost minimization curves for values of VR, as this determines the size of WR and D, which in turn affect the costs of the system. We may be known for a particular application, usually for small units, but for utility power it is likely that the maximum energy for the given site is required. It would seem apparent that a site with high values of Vm would be chosen over one with a lower value, but the wind distribution affects cost via the values of We and D.
This would seem to be similar in principle to the Venturitype augmentation in providing a pressure lower than atmospheric at the system discharge, but in this case by means of an axisymmetric vortex rather than the toroidal one of the ring-wing concept. The pressure drop across the turbine is much larger with the Yen concept than with the ring-wing design. The total quantity of air is many times that of the simple turbine of equivalent area, but the collecting surface of the tower and all is also much larger and the direct connection between total frontal area and increased power output is not immediately apparent.
This is a consequence of the turbulent momentum interaction between the inside and outside air flows. This phenomenon was first reported by the Israeli group and confirmed by Oman, and it results in the major augmentation effect of the system, a phenomenon which had not been previously recognized, with the result that for many years ducted turbines were thought not to be capable of giving a satisfactory performance. It is also important that the effect is considered to be mainly due to the ideal flow pattern and not to viscous action, as the test program was conducted with small models and with low Reynolds numbers, hence extension of scale might show disappointing results if viscous effects were predominant.
Advances in Energy Systems and Technology. Volume 1 by Peter Auer (Auth.)