近年來由於能源危機之問題，再生能源發展與研究日趨重要，本論文是利用田口法探討雙顆垂直軸風機之排列（Vertical Axis Wind Turbine, VAWT），使用商業套裝軟體FLUENT進行模擬。影響風機的功率係數像是尖端速度比λ(Tip speed ratio)、風機的夾角、風機轉軸角度位置、兩顆風機間距、兩顆風機的旋轉方向…等原因，因此利用田口法中田口式參數設計法，經由直交表找出優化雙顆風機排列之組合，使風機之性能有所提升。在此計算中利用SIMPLEC/QUICK之數值方法、k-ε紊流模型與分離渦流模擬法DES（Detached Eddy Simulation）在四邊形/三角形網格上求解非穩態不可壓縮納維史托克方程式（Navier-Stokes Equation）。首先對翼型為NACA0015單顆與雙顆進行風機流場模擬計算，其次利用田口法之參數設計選擇五種控制因子，每個因子四種水準之組合，組成L16直交表，使用商業套裝軟體FLUENT進行模擬。田口法找出優化參數組合為: 夾角β=120°、尖端速度比λ=2、間距=1.5D、風機旋轉方向:第一顆風機順時針旋轉和第二顆風機為逆時針旋轉、第二顆風機轉軸角度位置 =0°，模擬出來第一顆風機的功率係數為0.533586和第二顆的功率係數為0.479142，雙顆風機的平均值為0.506364。透過田口法可以優化雙顆直立葉片式垂直軸風機的功率係數，使雙顆風機的平均功率能夠提升。在直交表中，分別計算16組模擬的S/ N比，將數值轉成因子反應表。而因子反應表中每個因子最大水準的值減最小水準的值可得Effect，Effect越大代表此因子效應對風機的功率係數影響越大，Effect由大到小的排列順序分別為:尖端速度比λ>角度β >風機旋轉方向>間距d >風機轉軸角度位置θ。最後隨機抽樣4組實驗與優化組合比較，結果顯示優化後的功率係數最好。

Due to the worldwide energy crisis, renewable energy development has become more important recently. Computational studies have shown a significant importance to carry out the research with large number of parameters .The purpose of the study is using the Taguchi method to approach the optimum power coefficient of straight-bladed vertical axis wind turbines (SB-VAWT). Straight-Bladed Vertical Axis Wind Turbines consist of three NACA0015 profile blades, chord length of 0.4m, the radius of wind turbine is 1.25m. The commercial CFD software FLUENT 14.0 is used for the numerical simulation. The SIMPLEC/QUICK method, SST k-ω and Detached Eddy Simulation models are adopted to solve unsteady two dimensional incompressible Navier-Stokes Equation on the quadrilateral/triangular meshes. The performance of vertical axis wind turbines is adopted as power coefficient. In Taguchi method, the influences of five parameters, namely, TSR(tip speed ratio ), the rotor angle , azimuthal angle , rotation direction ,and turbine spacing are chosen. The analysis of the signal-to-noise ratio suggests that the TSR is the most important factor in determining the performance and the TSR is 2 .The performance is also significantly affected by rotor angle, where a rotor angle is 120°. Rotation direction for one turbine is clockwise,and two turbine is counter-clockwise. According to Taguchi method recommended operating conditions, the numerical results show that the average power coefficient of two vertical axis wind turbine can be improved.

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