垂直軸升阻力混合型風車流場之數值模擬

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Title:	垂直軸升阻力混合型風車流場之數值模擬
Other Titles:	Flow simulation of hybrid lift and drag type vertical-axis wind turbines
Authors:	張潔舲;Jhang, Jie-Ling
Contributors:	淡江大學航空太空工程學系碩士班陳慶祥;Chen, Ching-Hsiang
Keywords:	FLUENT;阻力型垂直軸風機;升力型垂直軸風機;升阻力混合型風機;Drag type vertical-axis wind turbines;lift type vertical-axis wind turbines;hybrid lift and drag type vertical-axis wind turbines
Date:	2015
Issue Date:	2016-01-22 15:05:43 (UTC+8)
Abstract:	本研究使用計算流體力學軟體FLUENT來分析垂直軸升阻力混合型風車之流場，求解二維非穩態不可壓縮紊流的Navier-Stokes方程式。首先用Pro/E繪製風機外型，網格產生軟體建立非結構網格及給定邊界條件。模擬共分為三部分，第一部分從阻力型風機模擬開始，觀察阻力型風機產生扭矩之能力，再加裝導風罩，模擬導風罩對阻力型風機輸出扭矩之影響。結果阻力型風機發電效益甚差，加裝導風罩可以得到較好的效益。第二部分為升力型風機，以三葉片及四葉片風機使用不同的旋轉半徑、不同的翼弦長進行模擬，觀察其結果。在增加旋轉半徑時，風機也能得到較高的扭矩；在不同的翼弦長的部分，在三葉片風機的部分並沒有呈現阻塞效應，而在四葉片風機卻呈現出阻塞效應。第三部分結合升阻力混合型風機，藉由阻力型風機降低啟動風速，升力型風機得到較好的發電效益，從模擬來看加裝阻力型葉片確實提升了風機的效能。 This thesis simulated hybrid lift and drag type vertical-axis wind turbines using CFD software, FLUENT. The governing equations were two-dimensional, unsteady, incompressible, turbulent Navier-Stokes equations. We used Pro/E to draw wind turbine models, and then employed Gambit to generate unstructured grids and set the boundary conditions. The simulations included three parts. The first part simulated drag type wind turbines. We observed the torque generating ability of drag type wind turbines. We installed deflectors to study their influence on the output torque. The results show that deflectors can increase the output torque due to the vortex generated by the deflectors. The second part simulated three-bladed and four-bladed lift type wind turbines. We studied the effects of wind turbine radius and blade chord length on the output torque. The results demonstrate that increasing the chord length increases the torque. A longer chord length increases the torque, but only up to a certain point, after that the blockage effect appears. Three-bladed wind turbines did not have blockage effect and four-bladed wind turbines do have. The third part simulated hybrid lift and drag type wind turbines. Drag type wind turbines can help reduce the starting wind speed for the turbines. Lift type wind turbines have better power generation efficiency than that of drag type. The simulation results show that hybrid wind turbines do increase the efficiency of the wind turbines.
Appears in Collections:	[Graduate Institute & Department of Aerospace Engineering] Thesis

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