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Whenever such data are needed, for example to compute the performance of a wind turbine at high wind speeds, much engineering skill and experience is needed to construct such post-stall data in order to obtain an acceptable result, see also Snel et al. (1993), and Chaviaropoulos and Hansen (2000). , 1997). Limiting streamlines are the flow pattern very close to the surface. 7 shows that for this specific blade at a wind speed of 10m/s the flow is attached on the outer part of the blade and separated at the inner part, where the limiting streamlines have a spanwise component.

24) It is easily seen that Cp, max=16/27 for a=1/3. 4. This theoretical maximum for an ideal wind turbine is known as the Betz limit. 4. 5 showing measurements of CT as a function of a for different rotor states. 0 cP 1:>. 'Q 0 EMPIRICAL EMPIRICAL I- PROPELLER EMPIRICAL STATE EMPIRICAL ..... I I tv. EMPIRICAL EMPIRICAL EMPIRICAL "l i' lJr>~ 0 tv. VORTEX RING STATE I ~~ ~OME~TUM I I EMPIRICAL EMPIRICAL "l 0 1:>. :ili THEORY NOT VALID I "y I ''( ~ 1 \ 'I I tv. / PROPELLER BRAKE o NACA MR NO . 16.

25) A high thrust coefficient CT and thus a high axial induction factor a is for a wind turbine present at low wind speeds. 4 is that the free shear layer at the edge of the wake becomes unstable when the velocity jump Vo–u1 becomes too high and eddies are formed, which transport momentum from the outer flow into the wake. 7. Effects of rotation (Glauert optimum rotor) The following section concerns with some effects of wake rotation and the theory of an optimum rotor as described by Glauert (1935).

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