Download e-book for kindle: Advances in Energy Systems and Technology. Volume 1 by Peter Auer (Auth.)

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By Peter Auer (Auth.)

ISBN-10: 012014901X

ISBN-13: 9780120149018

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Example text

Lapin takes into account the additional drag forces due to the unconventional system, which are significant. These are rolling friction forces due to (1) the weight of the rotor, cart, etc. and to (2) the cross-track force. 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.

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. He gives examples of overall power coefficients and power losses for a variety of system parameters.

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.

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


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