小型風力機葉片二維翼型流固耦合分析

Analysis of Fluid-Structure Interaction of a 2D Blade for a Small Wind Turbine

林建華(Jiean-Hua Lin)

指導教授 ： 駱正穎

國立虎尾科技大學/工程學院/航空與電子科技研究所/碩士(2010年)

https://doi.org/10.6827/NFU.2010.00120

摘要

風力發電機在這個節約能源時代已被廣泛使用，葉片的設計影響風機效率甚大，為了設計一個有效率的風電機，必須了解風的負載和葉片間的交互作用，目前有很多的研究還是傾向於風的載荷和結構分析是相互分開進行的。因此本研究主要在於探討流體和葉片的耦合效應，以增進對風力發電機葉片行為的了解。
本研究利用分析軟體ANSYS與計算流體力學軟體CFX來進行二維風機葉片流體/固體耦合分析。分析的因素包括風速、攻角以及彈性模數對葉片變形以及升力、阻力的影響。計算方法採用交差疊代方法進行，直到流體/固體界面位移與作用力達到收斂條件為止。分析結果顯示，彈性材質葉片因為變形的關係改變流場在較高的風速時可降低63.79％ 的升力係數以及2.05％ 的阻力係數。

關鍵字

流固耦合 ； 阻力係數 ； 升力係數 ； 風機葉片

並列摘要

Wind turbines have being attracted a lot of interest in engineering applications as the requirement for clear energy increases. Appropriate blade design has a significant effect on the efficiency of a wind turbine. To design an efficient wind turbine, it is necessary to understand the interaction between wind loads and blades. Many present studies focus on these two topics separately because highly dissimilar characteristics between them. The present study aims to investigate the coupling effect of wind loads and 2D blades for a small scale wind turbine.
The present study applies the analysis software ANSYS and the computational fluid mechanics software CFX to conduct a two-way fluid structural analysis of a 2D blade. The effect of factors, include angle of attack, wind speed and Young modulus of blades, on the drag and lift are covered in the study. The information of displacement and force along the fluid structural interface are hand-shaked through stagger iteration between the fluid solver and the solid solver that individual calculation of field variables are carried out in the fluid solver and the solid solver until the displacement and force along the interface of fluid and structure are convergent. The analysis results show a blade with a flexible material under a high wind speed can reduce the drag coefficients by2.05 % and the lift coefficient by63.79%. This study provides a good insight for the design of blades for a small scale wind turbine.

並列關鍵字

Fluid-Structure Interaction ； Drag coefficient ； Lift coefficient ； Wind Turbine

參考文獻

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