Publicação
Passive blade ice protection using icephobic surfaces
| Resumo: | Ice accumulation on blade surfaces severely limits the normal operation of wind turbine generators. At present, commercially available technologies to mitigate this problem consist of expensive, energy hungry heating elements. An alternative is the implementation of icephobic coatings. The icephobicity of a surface can be quantified by measuring how strongly ice adheres to it. This simple statement implies rather complex tasks: creating artificial ice on a surface and removing the ice from the surface in a measurable and reproducible way. In the present research, a comprehensive study was conducted to characterize ice adhesion strength over various surfaces by using a custom-built shear strength tester. The studied surfaces include both laboratory developed and commercially available coatings. In addition, the contact angles for all the surfaces were also measured to correlate the wettability and the measured ice adhesion, that is, hydrophobicity with the icephobicity. Furthermore, two numerical simulations were performed to identify the measurement uncertainties of the ice adhesion test model and to analyse the effects of the aerodynamical forces that operate in a commercial turbine. The main results drawn from this work are that there is no direct relationship between icephobicity and hydrophobicity and that icing prevention on wind turbine blades by coating alone is not realistically enough. The alternative that best applies is the combination of an active ice mitigation system with the application of these coatings. |
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| Autores principais: | Gomes, Catarina Gonçalves Fernandes |
| Assunto: | Hydrophobicity Ice adhesion strength Icephobicity Shear stress Wind turbine blades Hidrofobicidade Força de adesão do gelo Gelofobicidade Tensão de corte Pás das turbinas eólicas Engenharia e Tecnologia::Engenharia Mecânica |
| Ano: | 2023 |
| País: | Portugal |
| Tipo de documento: | dissertação de mestrado |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade do Minho |
| Idioma: | inglês |
| Origem: | RepositóriUM - Universidade do Minho |
| Resumo: | Ice accumulation on blade surfaces severely limits the normal operation of wind turbine generators. At present, commercially available technologies to mitigate this problem consist of expensive, energy hungry heating elements. An alternative is the implementation of icephobic coatings. The icephobicity of a surface can be quantified by measuring how strongly ice adheres to it. This simple statement implies rather complex tasks: creating artificial ice on a surface and removing the ice from the surface in a measurable and reproducible way. In the present research, a comprehensive study was conducted to characterize ice adhesion strength over various surfaces by using a custom-built shear strength tester. The studied surfaces include both laboratory developed and commercially available coatings. In addition, the contact angles for all the surfaces were also measured to correlate the wettability and the measured ice adhesion, that is, hydrophobicity with the icephobicity. Furthermore, two numerical simulations were performed to identify the measurement uncertainties of the ice adhesion test model and to analyse the effects of the aerodynamical forces that operate in a commercial turbine. The main results drawn from this work are that there is no direct relationship between icephobicity and hydrophobicity and that icing prevention on wind turbine blades by coating alone is not realistically enough. The alternative that best applies is the combination of an active ice mitigation system with the application of these coatings. |
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