WIND SHEAR AND TURBULENCE CHARACTERISTICS FROM INFLOW MEASUREMENTS ON THE ROTATING BLADE OF A WIND TURBINE ROTOR - PowerPoint PPT Presentation

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WIND SHEAR AND TURBULENCE CHARACTERISTICS FROM INFLOW MEASUREMENTS ON THE ROTATING BLADE OF A WIND TURBINE ROTOR

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wind shear and turbulence characteristics from inflow measurements on the rotating blade of a wind turbine rotor helge aagaard madsen andreas fisher – PowerPoint PPT presentation

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Title: WIND SHEAR AND TURBULENCE CHARACTERISTICS FROM INFLOW MEASUREMENTS ON THE ROTATING BLADE OF A WIND TURBINE ROTOR


1
WIND SHEAR AND TURBULENCE CHARACTERISTICS FROM
INFLOW MEASUREMENTS ON THE ROTATING BLADE OF A
WIND TURBINE ROTOR
  • Helge Aagaard Madsen
  • Andreas Fisher
  • Aeroelastic Design Programme AED
  • Risoe National Laboratory DTU
  • Denmark
  • hama_at_risoe.dtu.dk

2
Outline
  • Why inflow measurements ?
  • The measurement set-up and method of data
    conversion
  • Results
  • Summary

3
Why inflow measurements ?
  • The objectives with inflow measurements on a
    rotor are to map or characterize the flow field
    (shear and turbulence characteristics) over the
    rotor plane
  • Such data can be used for
  • investigation, (validation) of power curves
  • investigation of loads
  • for turbine control, e.g. individual pitch
    control
  • derivation of wind shear and turbulence
    characteristics

4
Why inflow measurements ?
  • Advantages when compared with ordinary met. mast
    based measurements
  • measurements in the rotor plane high
    correlation between blade forces and the inflow
    data
  • well suited for complex inflow high shear,
    wakes, complex terrain
  • measurements along a path e.g. at 75 radius
  • relatively cheap to instrument a blade

5
Why inflow measurements ?
  • Disadvantages when compared with ordinary met.
    mast based measurements
  • the data have to be corrected for the influence
    on the flow from the rotor itself
  • measurements in a rotating frame of reference

6
Previous measurements on a 500 kW turbine (1994)
spectrum of inflow angle
spectrum of relative velocity
7
Previous measurements on a 100 kW turbine (1990)
investigation of different tip shapes
Power curves based on data averaged over one rev.
about 1 sec.
8
The measurement setup
One five hole pitot tube installed on the Siemens
3.6 MW turbine at the Høvsøre test site turbine
in March 2007

9
Site Overview
  • 5 Wind Turbines
  • 5 Wind Turbine Masts (70-116m)
  • 2 Obstruction Lighting masts (165m)
  • Meteorological Mast (116m)

10
The correction method
  • Raw data includes the influence from the rotor.
  • Two major components
  • induction from vortices in the wake
  • induction from the bound circulation around the
    blade section
  • The aeroelastic HAWC2 model in combination with
    an optimization routine used to extract free
    inflow data from the raw data and to derive the
    inflow data in a fixed frame of reference

11
Conversion of data from inflow to shear data
the axial flow velocity component

12
Conversion of data from inflow to shear data
the lateral velocity component

13
Results mast measurements - measurements from
March 28 2007 -

14
Results pitot tube inflow measurements
night

day
15
Results pitot tube inflow measurements
night

day
16
Results pitot tube inflow measurements

blade pointing downwards
blade pointing upwards
17
Results pitot tube inflow measurements

blade pointing downwards
blade pointing upwards
18
Results inflow measurements at 0420

19
Results inflow measurements at 0420

20
Results inflow measurements at 1440

21
Results turbulence

22
SUMMARY
  • we have demonstrated that wind shear and
    turbulence data can be derived from inflow
    measurements from a sensor on the rotating blade
    of a wind turbine
  • the method gives a detailed picture of the
    inflow conditions over the rotor disc
  • the method can be used in complex inflow
    situations such as strong shear, wakes, complex
    terrain etc.
  • what is needed in order to get the method
    implemented in the industry is the development
    of an autonomous inflow instrument package with
    power supply, data acquisition and data
    transmission integrated.
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