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Tuesday, March 27, 2012

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