與外界環境緊密結合之風能捕捉器整合設計

Integrated Design of the Wind Collector Combined Closely with the Surrounding Environment

詹芳彬(Fang-Bin Zhan)

指導教授 ： 戴昌賢 ； 徐子圭

國立屏東科技大學/工學院/車輛工程系所/碩士(2012年)

https://doi.org/10.6346/NPUST.2012.00208

摘要

風力發電機設計首要為有效獲取最大功率，其中關鍵之一在於風力蒐集裝置之設計。國內外對於風力收集裝置之研究大多數為單風罩的系統，因「高風速回壓」及「關斷風速」之問題依仍存在，故本研究設計一雙風罩風能蒐集器，探討其流場特性，並針對風能蒐集器和導風罩外型進行設計分析，以提升其風能轉換功率。研究方法採用CFD計算流體力學有限體積法求解Navier-Stokes方程式搭配Realizable k-ε、SST k-ω紊流模組，以不可壓縮流Coupled演算法為主；研究中利用多孔介質來模擬風扇所產生之阻力現象，風扇裝置於風能蒐集器漸縮之面積最小區域。研究顯示雙風罩風能蒐集器之效率高於單風罩風能蒐集器，且風能蒐集器採擴流器外型並於風扇尾段開孔有最佳CP值。為實現中小型風力機都市化之趨勢，故本研究設計一運用於建築物上之具導流片上升型風能蒐集器，分析五種外罩直徑和葉片高度、五種入口間隙下有無半罩之效率、風扇尾段出口管三種高度和四種直徑、六種管槽切高度。另本研究設計一水平/彎管式對稱型風能蒐集器，具一前一後的風扇以蒐集兩側風能，分析三種喇叭狀外罩直徑、三種管型、開孔式、插管式及安裝於山峰稜線地形上之效率，結果顯示開孔式對稱管型具高度差彎管式風能蒐集器，將前後孔同時開啟有最佳CP值，且安裝於山峰稜線之地形上CP值達2倍以上。

關鍵字

風能蒐集器 ； 管型風機 ； 導流 ； 山峰稜線 ； 雙風罩

並列摘要

The primary concern of a wind turbine design is to obtain maximum power, and the key point is the wind collected. There are two problems exited from the past researches. One is the reversed pressure in high wind speed, and the other is cut speed. This thesis is carried out a design of the wind collector with two layers tube, and analyzes the optimal configuration of the wind collector to improve the wind energy transfer efficiency. This study is based on numerical simulation methods of using CFD computational fluid finite volume method for solving Navier-Stokes equations, to simulate the flow field of a series of wind collector. The CFD simulation used the finite volume incompressible algorithm, COUPLE, with realizable k-εor SST k-ω turbulent models to calculate. The wind turbine model is simplify a rotinal porous media, and mounted in the minimal cross section area of a tubal wind turbine devise. The results show that the performance of a wind collector with two layers cover is better than single layer cover, and it has better CP value in the design with the divergent nozzle. To achieve the small-sized wind turbine for the urbanization trend, this study designed a chimney type of the wind collector with guiding vans on the top of a building. There are five types covers with different height of vans, and five types of gaps with/ without cover, different kinds height/ diameter of a outlet, five types of outlet with cutting plane to simulate. Another wind collector with forward and backward wind turbine mounted on the mountain ridge is designed in a straight or s-duct tube to analyze the efficiency. The results show that the tubal wind collector with the by-pass channel in a s-duct tube has good CP value, and 2 times above efficiency while it is mounted on the mountain ridge.

並列關鍵字

wind collector ； tubal wind turbine ； guiding flow ； mountain ridge ； two layers cover

參考文獻

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