Wind energy conversion. Volume IX. Aerodynamics of wind turbine with tower disturbances
Lifting line theory which is the counterpart of Prandtl's lifting line theory for rotating wing is employed for the overall performance analysis of a horizontal axis wind turbine rotor operating in a uniform flow. The wake system is modeled by non-rigid wake which includes the radial expansion and the axial retardation of trailing vortices. For the non-uniform flow which are caused by the ground, the tower reflection, or the tower shadow, the unsteady airloads acting on the turbine blade are computed, using lifting line theory and a non-rigid wake model. An equation which gives the wind profile in the tower shadow region is developed. Also, the equations to determine pitch angle control are derived to minimize the flapping moment variations or the thrust variations due to the non-uniform flow over a rotation.
- Research Organization:
- Massachusetts Inst. of Tech., Cambridge (USA). Aeroelastic and Structures Research Lab.
- DOE Contract Number:
- EY-76-S-02-4131
- OSTI ID:
- 5477179
- Report Number(s):
- COO-4131-T1(Vol.9)
- Country of Publication:
- United States
- Language:
- English
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