Wind Tunnel Tests on Ice Accretion on Wind Turbine Blades

Preparation, Set-up

Adriana Hudecz

Martin O.L. HansenHolger H. Koss

DTU Wind Energy, Technical University of Denmark

Purpose

• Study the ice build-up

• Study the effect of ice on the aerodynamics

• Study the flow around the iced blade – flow visualization

• Compare results with numerical programs and other studies

2 7 February 2012

DTU Wind Energy, Technical University of Denmark

Wind Tunnel

• Climatic wind tunnel – FORCE Technology and DTU

– Rain, ice, snow

3 7 February 2012

[Picture: http://www.cesdyn.byg.dtu.dk/Research/Climatic_Wind_Tunnel.aspx]

DTU Wind Energy, Technical University of Denmark

Test set-up

4 7 February 2012

• NACA 64-618 airfoil section provided by LM Wind Power

• 900 mm chord length and 1350 mm width

DTU Wind Energy, Technical University of Denmark

Test set-up

5 7 February 2012

• NACA 64-618 airfoil section, provided by LM Wind Power

• 900 mm chord length and 1350 mm width

• A pair of AMTI MC5 Force transducer is also included in the set up

• Equipped with pressure taps

DTU Wind Energy, Technical University of Denmark

Test set-up - final

6 7 February 2012

In the workshop

DTU Wind Energy, Technical University of Denmark

Test set-up - final

7 7 February 2012

In the tunnel

Down stream Up stream

DTU Wind Energy, Technical University of Denmark

Test set-up - final

8 7 February 2012

DTU Wind Energy, Technical University of Denmark

Wind Tunnel Tests - Preparation

9 7 February 2012

• Due to unexpected circumstances

– Some velocity tests – test the set up

– Flow visualization – with oil based smoke generator and laser

DTU Wind Energy, Technical University of Denmark

Wind Tunnel Tests – Flow Visualization

10 7 February 2012

DTU Wind Energy, Technical University of Denmark

Wind Tunnel Tests – Flow Visualization

11 7 February 2012

DTU Wind Energy, Technical University of Denmark

Wind Tunnel Tests – Flow Visualization

12 7 February 2012

DTU Wind Energy, Technical University of Denmark

Wind Tunnel Tests – Further Plans

13 7 February 2012

• Dry test:

– Test of the set-up both aerodynamics and pressure distribution, flow visualization

• Ice test:

– Test of ice build up with different velocity and temperature

– Changes of aerodynamics as a function of time and amount ice

– Flow visualization

DTU Wind Energy, Technical University of Denmark

Thank you !Plans

14 7 February 2012

Contact: Adriana Hudecz, ahud@dtu.dk