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研究生:周碩城
研究生(外文):Shuo-cheng Zhou
論文名稱:CFX應用在旋轉機械之機翼流場及性能分析上之評估
論文名稱(外文):Evaluation of using CFX for flow field and performance analysis of rotating blades
指導教授:劉旭光劉旭光引用關係
學位類別:碩士
校院名稱:國立雲林科技大學
系所名稱:機械工程系碩士班
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2008
畢業學年度:96
語文別:中文
論文頁數:109
中文關鍵詞:噪音尾流扭力旋轉葉片翼尖
外文關鍵詞:noisetorquewaketiprotating balde
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本文之研究目的在於利用CFX軟體對旋轉機械流場進行分析。研究中首先利用Solidworks繪出標準機翼和商業風力發電機AIR403之幾何模型,並以AIR403翼展幾何形狀為基礎,將其翼尖幾何形狀近一步修改為翼尖帆(Winglet)與次翼;接著把幾何模型匯入CFX軟體,建立網格及設定相關邊界條件後,進行模擬及數據分析。在流場結果的觀察部份,主要是以標準機翼及AIR403為主,針對無風及風速5m/s下的流場變化特性做比較,以評估不同葉片幾何形狀間的流場差異。在無風時,葉片幾何形狀對整個流場變化有較明顯的影響;但在風速5m/s時,整個流場變化的差異性則較小。進一步探討翼尖局部幾何形狀差異之影響,則發現若只有翼尖幾何形狀設計改變時,對流場之影響較不明顯,但若翼展設計也變更時,則其變化則較為明顯。在速度分析部份,翼尖幾何形狀的不同對翼尖後方尾流的速度有較明顯的影響。若進一步依據環流強度及扭力大小比較氣動力性能,在無風狀態下,標準機翼之氣動力性能優於其他三組葉片,且若僅有翼尖幾何形狀不同時,對氣動力性能幾乎沒有影響;而在風速5m/s時,AIR403的表現亦優。在針對翼尖噪音的初步分析部份,AIR403的噪音值相較於其他三組機翼亦較低。但在機翼葉片應變分析中,則以AIR403系列之葉片的變形量最大(約71mm~75mm)。最後在實驗與模擬的比較驗證中,整體表現的扭力部分誤差較低,但在單點之風速分析比較中誤差則略微增加;儘管如此,沿著葉片r/R方向之局部U速度分佈趨勢仍頗為相似。
The goal of this study is using the software-CFX to carry out the flow field analysis of rotating blades. The blade of the commercial wind turbine AIR403 was used as the base model, and its tip was modified to the sub-wing and winglet model and then compared with the standard rectangular blade. The geometry of the test models was first prepared using Solidworks, and then fed into CFX for grid generation. After setting the appropriate boundary conditions, simulation and data analysis were carried out. Once compared the flow field structure, it shows that the difference between standard and AIR403 series blades is quite obvious under the no-wind condition; but as the free stream velocity increases to 5m/s, clear discrepancy is no longer noticeable. Also, the tip design changes make no apparent effects, except in the velocity variation inside the wake. Standard blade design is superior in terms of the bound circulation and torque under the no-wind condition, but standard AIR403 does better under 5m/s. Standard AIR403 also shows better performance in aerodynamic noise, but the whole series display larger tip deflection ( 71mm ~ 75mm). Finally, simulation results were compared with experimental measurement. The torque prediction shows very good agreement. However, the span wise velocity distribution presents larger deviation near the tip region, although its trend is the same.
中文摘要-------------------------------------I
英文摘要------------------------------------II
誌謝---------------------------------------III
目錄----------------------------------------IV
表目錄-------------------------------------VII
圖目錄-------------------------------------VII
符號表-------------------------------------XII

第一章 緒論----------------------------------1
1-1前言--------------------------------------1
1-2文獻回顧----------------------------------1
1-2.1 翼尖渦旋-------------------------------1
1-2.2 旋轉葉片之流場特性及噪音評估-----------2
1-2.3 葉片氣動力對性能之影響-----------------5
1-2.4 風力發電機流場之數值模擬---------------6
1-3研究動機及目的----------------------------9

第二章 實驗設備-----------------------------12
2-1 風力發電機系統及量測位移平台------------12
2-1.1 風力發電機系統------------------------12
2-1.2 量測位移平台--------------------------12
2-1.3 風力發電機葉片------------------------14
2-2 流場量測系統----------------------------16
2-2.1 熱線測速儀(HOT-WIRE ANEMOMETER)-------16
2-2.2皮托靜壓管與差壓計---------------------19
2-2.3 桌上型風洞----------------------------20
2-3資料擷取系統-----------------------------21
2-3.1 類比數位轉換卡(A/D CARD)--------------21
2-3.2 SAMPLE AND HOLD CIRCUIT(SHC)--------22
2-3.3低通濾波器(LOW PASS FILTER)----------22

第三章 CFX模擬------------------------------23
3-1 CFX模擬介紹-----------------------------23
3-2 模擬步驟--------------------------------23
3-3 模擬參數與基本假設----------------------26
3-4 模擬繪圖與數據處理----------------------26

第四章 結果於討論---------------------------29
4-1 網格疏密之影響分析----------------------29
4-2 流場觀察--------------------------------32
4-2.1有風和無風狀態下之比較-----------------32
4-2.2 機翼葉片幾何之影響--------------------36
4-2.3流場隨時間之變化趨勢-------------------40
4-3 翼尖幾何形狀對壓力之影響----------------54
4-4 速度分析--------------------------------54
4-4.1 特定位置之速度變化--------------------58
4-4.2空間幾何形狀變化對速度之影響-----------64
4-4.3翼尖環流強度分析-----------------------66
4-5 噪音分析--------------------------------70
4-6 扭力分析--------------------------------70
4-7 葉片壓力、應力分析----------------------71
4-8 模擬與實驗比較--------------------------78
4-9 亟需解決之問題--------------------------80
4-9.1 邊界條件設定之影響--------------------80
4-4.2 流場暫態現象之影響--------------------83

第五章 結論---------------------------------90
5-1結論-------------------------------------90
5-2 建議與未來展望--------------------------91
參考文獻------------------------------------92
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