再生能源的發展可以有效減少燃燒化石燃料所衍生的問題，而風力發電是目前世界上增長最快的能源。小型垂直軸風機適合住宅發電，顯示安裝在城市屋頂的潛力。本文所探討之直立葉片垂直軸風機 (SB-VAWT) 包含三片NACA0015翼型之直立葉片，弦長為0.4公尺，風機半徑為1.25公尺。首先利用GAMBIT建立風機之幾何外型，接著使用商業軟體ANSYS 16.0進行流場計算。影響風機系統之輸出功率本文選用之參數為：風機間夾角 (β)、尖端速度比 (λ)、風機間間距 (S)、風機旋轉方向，及相位角 (ϕ) 五個參數來優化雙顆垂直軸風機系統。使用田口方法進行分析，對於每個參數，考慮四個不同的水準。經由分析，五個因子對於輸出功率的影響力排名為：尖端速度比 > 風機間夾角 > 風機旋轉方向 > 風機間間距 > 相位角。最佳之組合為β = 120º，λ = 2，S = 3.0d，旋轉方向= (順，逆)，和ϕ = 0º。經由優化後，雙顆風機系統之平均功率係數相對於單顆風機提升9.97%。接下來，依據上述最佳化雙顆風機之排列進行四顆風機陣列之配置，下游風機對與上游風機對之距離為15公尺。經由計算結果顯示，下游風機對之平均功率係數相對低於上游風機對35.2%，相較於單顆風機之功率係數，總平均功率係數下降13.99 %。雙顆及四顆風機系統之噪音分布具有方向性，與自由流垂直之上下方位之噪音較大。在離中心左右方向約250公尺外之區域，雙顆及四顆風機之噪音分別符合第三類管制區之噪音管制標準，及第四類管制區之噪音管制標準。

Wind power is the world's fastest growing energy resource currently. In particular, small scale VAWTs are suitable for residential power generation and show potential for urban rooftop installations. The power output of two straight-bladed vertical-axis wind turbines is simulated numerically as well as analyzed and optimized using the Taguchi method. Five operating factors of incoming flow angle (β), tip speed ratio (λ), turbine spacing (S), rotational direction (RD), and blade angle (ϕ) along with four levels are taken into consideration to account for their influences on the performance of the dual turbine system. An orthogonal array of L16(45) is designed. The profile of extent indicates that the factors λ and β play a crucial role in determining power output, whereas the factor ϕ almost plays no part on the power output. Moreover, the influence strength order of each factor is featured by λ > β > RD > S > ϕ. Furthermore, the analysis of the single-to-noise suggests that the combination of the five factors for optimum operation conditions is located at λ=2, β=120º, (clockwise, counterclockwise), ϕ=0º, and S=3d, as a result of the enhancement in the interaction of the two turbines. Compared to the single wind turbine operated at λ=2 along with counterclockwise rotation, the mean power output ( ) of the two turbine system is enlarged by 9.97 %. Then, based on optimization of two turbines, the downwind turbine pair in the four-turbine array are spaced 15 m from the upwind turbine pair. Results of the average power coefficient suggest that the downwind turbine pair are about 35.2% lower compared to the upwind turbine pair. In the sound field calculation, (far from x=250 m, x= -250 m) the two SB-VAWTs system and the Four-turbine arrays conform to the third category control area of noise control criteria and the fourth category control area of noise control criteria, respectively.

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