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研究生:陳威錚
研究生(外文):Wei-Cheng Chen
論文名稱:在加密四面體/稜鏡型網格上計算旋翼葉片流場及噪音
論文名稱(外文):Computation of Rotor-Blade Flows and Noise on the Adaptive Tetrahedral/ Prismatic Meshes
指導教授:黃啟鐘
指導教授(外文):Chii-Jong Hwang
學位類別:碩士
校院名稱:國立成功大學
系所名稱:航空太空工程學系碩博士班
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:2006
畢業學年度:94
語文別:中文
論文頁數:85
中文關鍵詞:旋翼葉片流場及噪音可調四面體/稜鏡型網格上風有限體積法
外文關鍵詞:rotor-blade flow and noiseupwind finite-volume schemeadaptive tetrahedral/prismatic meshes
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  近年來,旋翼飛行器(例如直昇機)在國內航空運輸、救災及軍事用途方面日趨重要。隨著環保意識之抬頭,航空噪音問題逐漸受到重視。本文中,在可調四面體及稜鏡型網格上求解旋轉座標系統下之三維拿維-史托克方程式以探討旋翼流場及噪音現象。為準確且有效的模擬紊流邊界層,在旋翼葉片表面建構稜鏡型網格。然後,在其他流場區域建立四面體網格以完成可調計算。數值方法方面,包含Roe通量差分離法與Frink公式之網格中心有限體積上風法及四階Runge-Kutta時間積分法是被採用。為評估本數值求解步驟之準確性,本文探討懸浮狀態下具NACA0012翼剖面之雙葉片流場並與相關文獻中之翼表面壓力係數分佈比較。在不同旋翼截面處之等壓力線圖、等聲壓值圖及渦漩圖被提出以了解Baldwin-Lomax紊流模式中採用相對速度或絕對速度時之流場與噪音現象。
  With respect to the domestic transportation, relief of disaster and military utilization, the flying vehicle with rotor blade, such as the helicopter, becomes important in the recent years. The sense of environmental protection is on the increase, and the aero-noise problem is gradually emphasized. In this paper, the 3-D Navier Stoke’s equation in a rotating coordinate system is solved on the adaptive tetrahedral and prismatic meshes, and the phenomena of rotor-blade flows and noise are investigated. To simulate efficiently and accurately the turbulent boundary layer, the prismatic meshes around the surface of rotor-blade are created. Then, the tetrahedral meshes in the other regions are generated to finish the adaptive computation. For the numerical method, the Runge-Kutta time integration and a cell-centered upwind finite-volume scheme, which is based on the Roe’s flux-difference splitting and Frink’s formula are adopted. To evaluate the present solution procedure, the flowfields for a two-bladed rotor having the NACA0012 airfoil section in hover are studied, and the computed results of the surface pressure coefficient are compared with those in the related literature. For the Baldwin-Lomax turbulent model, in which the absolute velocity and the relative velocity are used respectively, the contours of pressure, sound pressure level and vorticity at the different locations are presented to understand the flowfields and noise behavior.
中文摘要                   Ⅰ
英文摘要                   Ⅱ
誌謝                     Ⅳ
目錄                     Ⅴ
圖目錄                    VII
符號說明                   ⅩⅠ
第一章 緒論                  1
1-1 前言                   1
1-2 文獻回顧                 1
1-3 研究內容                 1
第二章 數學模式及數值方法           7
2-1 數學模式                 7
 2-1-1 統御方程式              7
 2-1-2 紊流模式               10
2-2 數值方法                 13
 2-2-1 非黏滯通量計算            14
 2-2-2 黏滯性通量計算            17
2-3 時間積分法                18
2-4 邊界條件                 19
 2-4-1 外邊界層處理             19
 2-4-2 旋翼表面稜鏡型對應之虛擬網格之求法  20
2-6 噪音分析                 21
第三章 可調四面體與稜鏡型混合網格之建立    22
3-1 非結構四面體與稜鏡型網格之建立      22
3-2 可調非結構四面體與稜鏡型網格之建立    23
 3-2-1 加密誤差指標             24
 3-2-2 四面體網格加密            25
 3-2-3 稜鏡型網格加密            25
第四章 結果與討論               28
4-1 旋翼葉片之流場計算            29
4-2 旋翼葉片之噪音分析            31
第五章 結論                  33
圖                       35
參考文獻                    64
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