Aerospace Engineering, Wind turbines

Question 1

Function of blades

Answer 1

blades act as barriers to the wind. when wind forces blades to move, wind energy is transfered to the rotor

Question 2

function shaft

Answer 2

when rotor spins, shaft spins, mechanical energy is transferred into rotational energy. Shaft spins a generator to create electricity

Question 3

function generator

Answer 3

a generator uses the difference in electrical charge (electromagnetic induction) to produce a change in voltage, driving the electrical current through power lines for distribution

Question 4

What is Voltage

Answer 4

electrical pressure, the force, that moves an electrical current.
‘Voltage drives the electrical current’

Question 5

The turbine power equation

Answer 5

P = 0.5 * ρA * CpV^3

Wind turbine power= 0.5 times density of air times swept area times wind velocity cubed times power coefficiant

Question 6

Cp?

Answer 6

Power coefficient: between 0 and 1

Question 7

What influences the power coefficiant

Answer 7

Cp is dependent on the tip speed ratio λ and the pitch angle β of the blades

Question 8

A

Answer 8

swept area of the rotor

pi*r^2

Question 9

pitch angle ?

Answer 9

indicates how much the turbine blades are tilted

Question 10

tip speed ratio

Answer 10

product of rotational speed of shaft and radius of the turbine blades divided by windspeed

Question 11

What influences the power coefficiant

Answer 11

Cp is dependent on the tip speed ratio λ and the pitch angle β of the blades

Question 12

tip speed ratio

Answer 12

product of rotational speed of shaft and radius of the turbine blades divided by windspeed

Question 13

max λ

Answer 13

4pi/number of turbine blades

Question 14

rotational speed of blades omega:

Answer 14

ω is measured in rad/s