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

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By Peter Auer (Auth.)

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If V a v is the average local inviscid velocity at the rotor inlet and Vœ is the undisturbed freestream velocity then 3 R = (Yav/^oo) . The local pressure coefficient C p r is given by (p - p*)l (iρ Vl>), where ρ is the local static pressure, and hence for inviscid 2 2 flow ρ - px = ip(Vi - V ) and C p r = 1 - (V/Vx) . Thus R can be ex3/2 pressed as/? ~ (1 - C p r ) . For flow around a circular cylinder, the maximum theoretical value of the velocity is 2Voo, giving C p r = - 3 , and this occurs at the surface of the cylinder at the ends of the diameter perpendicular to flow.

The system resistances are categorized as the two rolling resistances due to the vertical and horizontal forces on the track, a resistance due to track curvature, and an aerodynamic resistance. A simple expression for rolling resistance was taken from railroad literature in terms of weight, with the weight being taken to include the aerodynamic forces of lift and drag which yield a moment giving rise to a vertical force acting on the track. Aerodynamic resistance of the cars was broken down into a value for the leading car as that of a streamlined locomotive, with the remainder as that for streamlined railroad cars, and a third value for unstreamlined cars being used for the turns.

VI. WIND CHARACTERISTICS AND SITING A. Wind Data, Velocity, and Power Duration, Rated Values In addition to its low energy density, the characteristics of wind power are its variability, its unpredictability except statistically over long ( 5 48 D. G. Shepherd periods of time, and its untransportability—it has to be used at a fixed location. Because of the cubic relationship for power/speed, it is of the utmost importance that the wind characteristics at a potential site are known—once in situ it would be disastrous to have to move a system of any size.

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