Numerical modelling of hailstone impact on the leading edge of a wind turbine blade

Mark Hugh Keegan, David Nash, Margaret Stack

Research output: Contribution to conferencePaper

6 Citations (Scopus)

Abstract

The scale of modern blades means that tip speeds in excess of 100ms-1 are now common in utility scale turbines. Coupling this with a hailstone terminal velocity ranging from 9ms-1 to 40ms-1, the relative impact velocity becomes highly significant. There is little published data on the performance of blade materials under these impact conditions and as such this work aims to understand the impact phenomena more clearly and consequently characterize the impact performance of the constitutive blade materials. To better understand hailstone impact, the LS-DYNA explicit dynamics code was employed to simulate hailstone impact on the blade leading edge. A Smooth Particle Hydrodynamics approach (SPH) was chosen to represent the hailstone geometry. It was found that the forces and stresses created during hail impact are significant and in some cases damaging, therefore posing both short and long term risks to the material integrity. It was also found that coating systems such as the gel coat provide essential – and in extreme conditions, sacrificial – protection to the composite substrate.
LanguageEnglish
Number of pages11
Publication statusPublished - 4 Feb 2013
EventEWEA Annual Wind Energy Event 2013 - Vienna, Austria
Duration: 4 Feb 20137 Feb 2013

Conference

ConferenceEWEA Annual Wind Energy Event 2013
CountryAustria
CityVienna
Period4/02/137/02/13

Fingerprint

Turbine Blade
Wind Turbine
Numerical Modeling
Wind turbines
Turbomachine blades
Blade
Precipitation (meteorology)
Turbines
Gels
Hydrodynamics
Coatings
Geometry
LS-DYNA
Composite materials
Substrates
Turbine
Integrity
Coating
Excess
Extremes

Keywords

  • blades
  • leading edge
  • hailstone
  • impace
  • composites

Cite this

Keegan, M. H., Nash, D., & Stack, M. (2013). Numerical modelling of hailstone impact on the leading edge of a wind turbine blade. Paper presented at EWEA Annual Wind Energy Event 2013, Vienna, Austria.
Keegan, Mark Hugh ; Nash, David ; Stack, Margaret. / Numerical modelling of hailstone impact on the leading edge of a wind turbine blade. Paper presented at EWEA Annual Wind Energy Event 2013, Vienna, Austria.11 p.
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Keegan, MH, Nash, D & Stack, M 2013, 'Numerical modelling of hailstone impact on the leading edge of a wind turbine blade' Paper presented at EWEA Annual Wind Energy Event 2013, Vienna, Austria, 4/02/13 - 7/02/13, .

Numerical modelling of hailstone impact on the leading edge of a wind turbine blade. / Keegan, Mark Hugh; Nash, David; Stack, Margaret.

2013. Paper presented at EWEA Annual Wind Energy Event 2013, Vienna, Austria.

Research output: Contribution to conferencePaper

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AU - Nash, David

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AB - The scale of modern blades means that tip speeds in excess of 100ms-1 are now common in utility scale turbines. Coupling this with a hailstone terminal velocity ranging from 9ms-1 to 40ms-1, the relative impact velocity becomes highly significant. There is little published data on the performance of blade materials under these impact conditions and as such this work aims to understand the impact phenomena more clearly and consequently characterize the impact performance of the constitutive blade materials. To better understand hailstone impact, the LS-DYNA explicit dynamics code was employed to simulate hailstone impact on the blade leading edge. A Smooth Particle Hydrodynamics approach (SPH) was chosen to represent the hailstone geometry. It was found that the forces and stresses created during hail impact are significant and in some cases damaging, therefore posing both short and long term risks to the material integrity. It was also found that coating systems such as the gel coat provide essential – and in extreme conditions, sacrificial – protection to the composite substrate.

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Keegan MH, Nash D, Stack M. Numerical modelling of hailstone impact on the leading edge of a wind turbine blade. 2013. Paper presented at EWEA Annual Wind Energy Event 2013, Vienna, Austria.