By Peter Auer (Auth.)
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Extra info for Advances in Energy Systems and Technology. Volume 1
Other ways of showing this distribution data are by a frequency curve, with duration in hours per years or fractionally as ordinate against 70 ΜΥΝΥ00 ANELOG ( N. WALES ) 29-0 MPH 0 KXX) 2000 3000 4000 5000 6000 7000 8000 8760 HOURS IN THE YEAR Fig. 35. Velocity-duration curve—world sites. mean 0 Fig. 36. 20 4 0 60 80 100 PERCENT OF YEAR Velocity-duration curves in terms of mean velocity. ) wind speed, or as probability density versus speed or probability function (Smith, 1977). Figure 37 shows such a probability plot, also demonstrating that there is a considerable difference seasonally and this of course can be important.
Rolling friction coefficients from railroad freight car technology are used. The cross-track force is computed in terms of the aerodynamic force expressions, and thus varies with position. The maximum cross- 30 D. G. Shepherd track force is important for calculating structural stresses and the tipping moment. There is also cart drag, which is calculated with a drag coefficient equal to the aerodynamic equivalent flat plate area, taken as invariant with flow angle, and integrated around the circuit for varying angular position.
This is his basis for an investigation of this type of WECS. The analysis considers only a flattened oval (race course) type of track, with no power contribution being taken for the turns. , 1974), the aerodynamic analysis is minimal and the problem of the value of the interference factor a and the actual value of the flow velocity of the disk is not discussed. Several airfoils from the NACA series were investigated, with the ubiquitous 0012 type being selected for the detailed calculations, using corrections for finite aspect ratio.