Shield 9, having the cross sectional form of a circular arc, is attached to airfoil 2 on circular arc tracks and rollers, not shown. Wind tunnel tests have shown major improvements in aerodynamic performance due to the presence of shield 9, and due to aerodynamic seals. In the wind turbine, the component of the resultant wind force on the blade which lies in the whirling plane of the blade perpendicular to the long axis of the blade produces a driving torque around the generally horizontal axis of the power shaft 3A, acting from airfoil 2 to blade shank 3B to power shaft 3A. This driving torque rotates the power shaft, delivering the useful power which performs the work accomplished by the shaft. In FIG. 9 pivot 21 stands between the wind-forced whirling motion of the aerodynamic blade and the generator-resisted spinning motion of mill shaft 20; it is one part of the power train which transmits mechanical power from airfoil 2 to alterantor 30. In FIGS.
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11 is on the far side of the blade from the reader. The functions accomplished are: universal centrifugal blade angle control, varying both r and ψ of expression (5); gyroscopic control of whirling disk coning angle θ (see FIG. The gyroscopic moment due to the spinning roller adds to the aerodynamic moments already present in the whirling blade due to wind pressure across the whirling disk.
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The airfoil tip which is present on all these blades tends to be relatively smaller on the larger machines, becoming larger on the smaller machines until it supplants the roller altogether. Therefore, (see expression (1)) the roller mountings on large machines are more lightly loaded, relative to roller weight, than on small machines, relatively favoring the use of rollers on large machines as compared to small machines. Therefore, these principles are presented in some detail.
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The net resultant of these opposing actions, varying as the conditions of operations vary, constitute a blade pitch adjustment means which is free of any directly applied “hard” mechanical moments, such as conventional gear-driven or hydraulically-driven blade pitch control systems. Ship 8 can sail closer to the wind while tacking, and sail relatively faster, than the Flettner Rotor Ship of the 1920s, with less power expended in reversible electric motors 7. These improvements are due to the reductions of wake drug by the presence of airfoil 2, the reductions of induced drag by means of airfoil 4 and plate 5, and the reduction of power to spin the rollers by the elimination of Flettner’s spinning end disks. Aliviar dolor de cuello y espalda . Power driven aerodynamic roller 1 is mounted on its spinning axis in the leading portion of airfoil 2, which provides mechanical support for both ends of roller 1. Airfoil 2 pivots freely in pivoted mounting base 3A by means of blade shank 3B which is attached structurally to airfoil 2. Base 3A is the object to be kept in movement by the power of the wind.
A fresh approach to wind power is offered, not limited to the opportunities offered by the Magnus roller, but also employing the conventional airfoil section were it serves best. On the smallest wind turbines, roller/airfoils of the most efficient form for power recovery are largely ruled out by practical difficulties–the reverse of those advantages stated above–RPM values are higher than existing practice, or U/V values are too low to obtain sufficient aerodynamic benefit of the rollers. On the other hand, the conventional rigidly anchored airfoil structure, as used in large wind turbines, has well-known aeroelastic limitations. The roller/airfoil of this invention is less sensitive to flutter and forced vibrations than is a conventional rigidly attached airfoil type blade. Blade Variations–Horizontal Axis Wind Machines FIG.