Week 3 Wind Power Flashcards
what is the Coriolis force
fictitious force in rotating reference frame
what is the coriolis force equation
F = -2mωαv
what does the coriolis force do to the wind in the different hemispheres
deflects wind to the right in the north
deflects wind to the left in the south
how do we treat wind in order to find power and what is the associated equation
treat wind as a fluid
P=1/2ρAv^3
why does pressure drop across the turbine
due to force turning blades
what is the wind power coefficient equation
Cp = Pt / P0
why is thw wind turbine blades angled
so that they are more efficient
what two factors are important to optimise the power of the turbine
rotation speeds and number of blades
when is the blade optimum
when whole stream interacts without turbulence
what is the characteristic lifetime equation
tw = d/u0
d is the characteristic perturbation length of wind by a single rotating blade
u0 is the incoming wind velocity
what is the optimum tip speed ratio equation
λ0 = 2πR/nd = 4π/h
what is the wind speed height dependence equation
u0 = U0ln(z/z0)
what is the ideal separation for wind turbines
if blade has diameter d then each blade should be separated by 5d
