論文名稱:

小型垂直軸風力發電機葉片應力分析

Stress Analysis of Small Vertical Axis Wind Turbine Blades

研究生:

洪雋翔 J.S.Hong

指導教授:

方亮彬 L.B.Fang

學位類別:

碩士

學校名稱:

建國科技大學

系所名稱:

機械工程系暨製造科技研究所

學號:

98017018

畢業學年度:

100

語文別:

中文

出版年:

民101

關鍵字:

垂直軸風力發電機 Vertical Axis Wind Turbines

葉片元素動量理論 Blade Element Momentum Method

多管流模型 Multiple Stream-tubes Model

X-FOIL X-FOIL

摘要:

本文以簡易氣動力模型結合電腦輔助工程分析軟體，針對承受空氣動力負載的小型垂直軸風力發電機葉片進行應力分析。分析葉片翼型包括NACA0012、NACA0015、NACA0018等三種不同類型，葉片轉速設為150 rpm、風速為4m/s。氣動力計算模型為應用葉片元素動量理論與多管流理論所建立的分析模型，應用此一模型，找出作用於各葉片翼型剖面上的升力與阻力，作為作用於各翼型剖面上的作用力。此外並透過比較X-FOIL和實驗資料，去驗證X-FOIL求得資料的可靠性，雖其最大誤差可達50%，但當雷諾數參數大於1.6 x 105時，且攻角小於10°時，各不同翼型的升阻力係數與實驗結果吻合。攻角會隨著葉片轉動角度而變化，升、阻力係數也隨之產生變化，同時影響葉片上應力分佈。由分析結果可見，葉片在固定風速與轉速下，葉片最大應力隨著轉動角度的變化，約當於葉片弦方向與風向平行時，葉片上的應力值較大。

A compact aerodynamics model combined computer-aided engineering analysis software was used to investigate the stresses of small scale vertical wind turbine blades subjected to the aerodynamics loads in this paper. The airfoil types used in the paper are NACA0012, NACA0015 and NACA0018 with the rotational speed 150 rpm and wind velocity 4 m/s. The model used to decide the aerodynamics loads on the blades was formulated with the blade element momentum method (BEM) and multiple stream-tubes method. The relations between lift-coefficient/drag-coefficient and angle of attack from X-FOIL are compared to experimental data to validate the data. Although the maximal errors are up to 50% in some ranges of Reynolds’ number and angle of attack, the comparison data shows that the two data are agree with well when Reynolds’ number is greater than 1.6 x 105 and the angle of attack less than 10°. The angle of attack, lift coefficient and drag coefficient are varied with the angles of rotation of blades, which change the stresses distribution of the blades. The results show that the stresses of blades varied with the angles of rotation of blades. The maximal von Mises stresses occurs when the blade chord is almost parallel to the direction of wind.