Wind Flashcards
1
Q
Betz Limit
A
(see equation)
2
Q
Engineering Condsiderations
A
- Make the rotor light and strong with consideration to material fatigue
- Rated power is the maximum power at which the machine will run continuously
- Capacity and capacity factor is the ratio of annual power output to that which the machine would have output had it been rated at that power throughout the year
- Less expensive to have one large machine producing the same output as a number of small ones
3
Q
Wing Planform Considerations
A
- To ensure that the optimum power out put occurs throughout the length of the blade, decrease twist as r increases
- Wider blade at the root, narrow at the tip is an attempt to harvest maximum power everywhere in the swept disc area
- Aerofoil shape to maximise Lift while keeping Drag low