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研究生： 達羅妮班妲拉
Bandharla, Dharani
論文名稱： 用於垂直風機之J型葉片最佳化設計:數值模擬與風洞實驗
Optimal Design of the J-Shaped Blade for VAWT: Numerical Simulation and Wind Tunnel Test
指導教授： 夏育群
Shiah, Yu-Chun
學位類別： 碩士
Master
系所名稱： 工學院 - 航空太空工程學系
Department of Aeronautics & Astronautics
論文出版年： 2024
畢業學年度： 112
語文別： 英文
論文頁數： 121
中文關鍵詞： J 型葉片 、2D 模擬 、3D 模擬 、田口法 、VAWT
外文關鍵詞： J-shaped blade, 2D simulations, 3D simulation, Taguchi method, VAWTs
相關次數： 點閱：50  下載：15 
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    • 本研究探討了垂直軸風力渦輪機（VAWT）的實驗與計算性能，以提高功率效率並優化葉片氣動特性，使用了一種獨特的設計——葉片尾緣處的開口。這些葉片稱為 J 型葉片，通過田口方法進行優化，用以設計數值實驗，以確定包括開口比、弦長和葉片厚度在內的最佳幾何參數組合。
    在本研究中，對風力渦輪機最佳設計的 2D 模擬和 3D 模擬結果進行了比較，並分析了傳統和 J 型葉片 VAWT 的力矩和功率係數。雖然進行了 2D 和 3D 模擬，但結果顯示兩者之間的差異非常小。數值結果表明，J 型葉片 VAWT 在低風速下相比傳統葉片能產生更多的功率。此外，J 型葉片還顯示出改進的自啟動穩定性。
    當與 3D 數值結果相比較時，發現基線葉片在 416 RPM 下達到了最大功率係數（CP ）0.122，而 J-NACA0018 葉片在 445 RPM 下達到了 CP 0.116。儘管最佳參數葉片的最大 CP值低於基線，但它在低風速下表現出更高的扭矩。風洞實驗結果與模擬結果之間的微小差異表明，最佳設計可以在低轉速和較低的 TSR 下提高葉片扭矩和功率係數。然而，優化葉片、基線 VAWT 和 J-NACA0018 葉片之間的 CP 差異很小。這表明 J 型葉片相比優化基線葉片，可能會增加或減少功率或扭矩。

    This study investigates the experimental and computational performance of vertical axis wind turbines (VAWTs) to enhance power efficiency and optimize blade aerodynamics using a distinctive feature—an opening at the blade's trailing edge. These blades, termed J-shaped blades, were optimized using the Taguchi method, which was employed to design numerical experiments aimed at identifying the optimal set of geometric parameters, including opening ratio, chord length, and blade thickness.
    In this research, the 2D simulations and 3D simulation results of the optimal design of wind turbines are compared to each other, and the moment and power coefficients were analyzed for both conventional and J-shaped blade VAWTs. Although both 2D and 3D simulations were performed, the results show that the difference between them is very small. The numerical findings indicate that J-shaped blade VAWTs generate more power at low wind speeds compared to conventional blades. Additionally, the J-shaped blades exhibit improved self-starting stability.

    When 3D numerical results compared with reveals that the baseline blade achieved a maximum power coefficient (CP) of 0.122 at 416 RPM, while the J-NACA0018 blade reached a CP of 0.116 at 445 RPM. Although the blade with optimal parameters has a lower maximum CP value than the baseline, it exhibits higher torque at lower wind speeds. experimental results The slight difference between the wind tunnel experimental results and the simulation results suggests that the optimal design can improve both blade torque and power coefficient at low rotational speeds and lower TSR. However, the difference in CP between the optimized blade, baseline VAWT, and J-NACA0018 blade is minimal. This indicates that the J-shaped blade can either increase or decrease power or torque compared to the optimized baseline blade.

    ABSTRACT IN CHINESE. i ABSTRACT ii ACKNOWLEDGEMENTS iv CONTENTS v LIST OF TABLES vii LIST OF FIGURES viii NOMENCLATURE xi CHAPTER I INTRODUCTION 1 1.1 Historical Description 1 1.2 Wind Energy 1 1.3. Types of Wind Turbine 1 1.3.1 Horizontal Axis Wind Turbine 2 1.3.2 Vertical Axis Wind Turbine 2 1.4 Literature Review 4 CHAPTER II THEORY OF VERTICAL AXIS WIND TURBINES 11 2.1 Aerodynamic Forces Diagram. 11 2.1.1 Tip Speed Ratio() 16 2.1.2 Angle of Attack() 16 2.1.3 Blade Pitch Angle() 17 2.1.4 Rotor Power Coefficient (Cp) 17 2.2 Motivation for Research 18 2.3 Scope of Research 19 2.4 Objectives of the Research 20 CHAPTER III RESEARCH METHODS AND EXPERIMENTAL APPARATUS 21 3.1 Airfoil Characteristics 21 3.2 Taguchi Method. 22 3.3 Experiment Arrangement 26 3.3.1 Wind Tunnel 26 3.3.2 Experimental Test Model 30 3.3.3 Experimental Test Equipment. 31 CHAPTER IV NUMERICAL SIMULATION 38 4.1 Governing Equations 38 4.2 Turbulence Model 39 4.3 Numerical Simulation of NACA0018 Airfoil 40 4.3.1 2D Simulation for Baseline Airfoil 40 4.4 Numerical Simulation of VAWT 46 4-5 Mesh 48 4.6 Blade Profiles. 53 4.7 Setting Up Boundary Conditions 54 4.8 Calculating Timestep 55 4.9 Solver Setup Processing 57 CHAPTER V SIMULATION RESULTS AND WIND TUNNEL TEST DATA 61 5.1 Numerical Simulation Results of VAWT Efficiency at Different AoA 61 5.2 Numerical Simulation Results of VAWT Efficiency for Distinct Blade 63 5.3 Numerical Simulation Results of the Taguchi Method 65 5.3.1 S/N Ratios Response Table and Response Graph 68 5.3.2: Analysis of variance 70 5.3.3 Cp Simulation Results of Taguchi method: 72 5.3.4 Dimensionless Analysis of Variance 76 5.3.5 Confirmation Run 78 5.4 Numerical Simulation of 3D Wind Turbine. 83 5.5 Wind Tunnel Experimental Results 93 CHAPTER VI CONCLUSION AND FUTURE WORK 101 REFERENCES 104

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