Wind turbine design

Q) What are four Aerodynamic design issues?

Ans)

• Flow unsteady most of time.
• Combined effects of wind shear.
• Atmospheric turbulence and gusts.
• Yaw misalignment and tower shadow.

Q) Is two dimensional airfoil data suitable for predicting the aerodynamic performance on stall regulated turbines ?

Ans) NO. Above are pics of 2D wind tunnel data.

Q) How do we achieve aerodynamic ( for peak power o/p) control?

Ans)

Stalling of blades:- blades are not accelerated but moved at const. velocity.

Pitch adjustment:- to allow for best in-flow angles.

Wind Turbines Rapid Fire

Q)How much is efficiency of Wind Turbines?

Ans) 40 %

Q) How long it takes to plan and buid a 5 MW wind farm?

Ans) 9 Months

Q) Wind power varies as wind speed?

Ans) Cube of v

Q) Wind power is directly proportional to

Ans) Height of blade.

Q) What are three factors behing wind turbine design?

Ans)

• Efficient airfoil design ( can increase 30 % energy capture)
• Rotor Efficiency( Better hub attachments allow for flex. rotors)
• Design of control devices

Q) Are 2 blade rotors better?

Ans) Yes , but they should be flexible enough for wind gusts.

Q)What is big deal about WT generator?

Ans) Design of generator which can respond to changes in Wind is a challenge.

Q)What is rotor speed?

Ans) rotor @ 60 rpm, generator @ 1800 rpm.

Q) What are 4 functions of turbine control?

Ans)

• To slow/stop the rotor.
• To prevent wind gusts from suddenly producing high power.
• To prevent turbine from vibrating.
• To mitigate damage from turbulent winds.

All above are achived by computer/microprocessor control.

Q) How much is cost of Winf farm?

Ans) Rs 50 million per MW

Q) Do you have any idea about wind power density at 50 m in India?

Ans) TN/Kerala/Karnataka about 350 to 450 W/sq. m