透過您的圖書館登入
IP:44.200.141.122
  • 學位論文

流體能量收集之研析

Investigation and Analysis of the Fluid Energy Harvesting

指導教授 : 戴昌賢

摘要


本研究主要為探討一種新形式的流體能量收集裝置,此裝置主要為放置在高空中,藉此收集空中之風能。考慮到傳統水平式風機其所產生的反扭矩過大,因而無法放置於空中;而垂直式風機由於攻角變化大,使最佳外型的探討相當困難,有鑑於此,本裝置所採用的風力收集器為豎管式風能收集器,有別於傳統水平式或垂直式風機,更適合用於空中風能的收集。 本裝置所使用的豎管式風能收集裝置,能將水平方向的來風轉換成垂直方向的風向,以克服傳統水平風機所造成的巨大反扭矩;然而,考慮到風能由水平轉換成垂直的過程中所造成的損耗以及豎管風能收集器的入口截面積小,因此利用改善風管外型以及使用前置三角翼來增強豎管式風能收集其內部風扇處的風速以及壓差來達到彌補在轉換方向過程中的損耗與入口截面積過小的缺陷。 關於前置三角翼的功用,主要是利用三角翼在一定攻角下所產生的前緣渦流對水平方向的來風進行加速,並使加速後的水平風導入後方的豎管式風能收集裝置入口,使豎管內的流速加快;而在前緣渦流的區域內,渦流中心會產生一相對低壓,此低壓則引導至後方豎管式風能收集裝置的出口,使管內的壓差增加。而前緣渦流的引導方式使用增加三角翼與豎管式風能收集裝置之間的間距,藉由改變此間距來分析前緣渦流對後方豎管式風能收集裝置的引響。 本研究主要是採用CFD計算流體力學有限體積法求解Navier-Stokes方程式搭配Realizable k-ε模組,以不可壓縮流Coupled法則演算為主,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,並配合三角翼風洞實驗比較流場現象。 研究結果顯示,最佳化後風管的功率係數可達0.468。若最佳化的豎管式風能收集裝置配合前置三角翼的最佳攻角、長度與間距,則功率係數可增加至0.531,相較於原始外型的豎管式風能收集器,其功率係數成長了103%;將結果應用於100公尺構型實體上,最終發電量可達到418(KW)。

並列摘要


The object of this thesis is the investigation of the fluid energy harvesting system. The primary mission is collecting wind energy in the high-altitude in this system. Because the horizontal wind turbine has a problem about anti-torque, it cannot be installed in the sky. And the vertical wind turbine’s AOA variation is severe, so the exterior is difficult to design. In view of this, the system adopts a new collector that use standpipe and elbow inlet to improve the anti-torque problem. The new collector is different from the horizontal wind turbine will more to fit in the sky. This new type collector using the elbow inlet to compel the horizontally wind become vertical wind. It can overcome the horizontal wind turbine’s anti-torque. However, the aerodynamic performance loss by the wall friction is existed in the elbow area and the collector’s inlet area is too small. So the collector’s exterior is designed and using the front delta-wing to augment the wind collection to overcome the aerodynamic performance loss and the small inlet area. About the front delta-wing, it using leading edge vortex to increase the horizontal wind speed and leading the vortex to the collector inlet where in the rear for improves power coefficient. In the leading edge vortex center has a relative low pressure. And the relative low pressure will be led to collector outlet for increase the pressure difference in the collector. The leading edge vortex led pattern is using spacing between delta-wing and collector. By changing the spacing, analyze the power coefficient in collector. 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-ε turbulent model to calculate. The wind turbine model is simplify a retinal porous media, and mounted in the minimal cross section area of a tubal wind turbine devise. And compare with wind tunnel experiments with delta wings for observe the flow field. The results show that the performance of a collector with the best exterior is better than original collector, and the power coefficient is 0.468. The collector with the best exterior and the best spacing delta-wing the power coefficient will be increased to 0.531. Compared to the original collector, the power coefficient grew by 103%. Using the results on the entity, the generated electrical energy would be rich 418 (KW).

參考文獻


[50] 王怡昌,2011,「中小型垂直軸風力發電機之氣動噪音分析」,國立中央大學機械工程學系碩士論文。
[29] 孫耘,2007,”新型垂直軸風力發電系統之設計與實現“,淡江大學電機工程學系碩士論文。
[46] 林家緯,2006 “低降低車輛外型設計方法”,pp.1-2,台灣大學機械系碩士論文集
[1] NOAA, 2013, “Trends in Atmospheric Carbon Dioxide”, Available at: www.esrl.noaa.gov/gmd/ccgg/trends/
[5] Biswas S, Sreedhar BN, Singh YP, 1995, “A New Analysis of Vertical Axis Wind Turbines,” Wind Engineering Journal, Vol.19, pp.107-119.

被引用紀錄


陳碧霞(2007)。裁決性應計模型檢定季盈餘管理績效之評估〔碩士論文,中原大學〕。華藝線上圖書館。https://doi.org/10.6840%2fcycu200700218
Li, K. F. (2009). 股利訊息、企業生產力與盈餘品質關聯性分析 [doctoral dissertation, National Taiwan University]. Airiti Library. https://doi.org/10.6342%2fNTU.2009.02803
杜佩玲(2009)。本益比、市淨率與投資報酬關係之研究〔碩士論文,國立臺灣大學〕。華藝線上圖書館。https://doi.org/10.6342%2fNTU.2009.00737
蘇秀怡(2003)。季盈餘特性與盈餘管理關係之研究〔碩士論文,元智大學〕。華藝線上圖書館。https://www.airitilibrary.com/Article/Detail?DocID=U0009-0112200611335243

延伸閱讀


國際替代計量