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研究生:黃啟忠
研究生(外文):Chi-Chung Huang
論文名稱:汽輪機低壓葉片流固耦合數值分析
論文名稱(外文):Numerical Analysis of Fluid-Structure Interactions in Steam Turbine Low-Pressure Blades
指導教授:林昭文林昭文引用關係
指導教授(外文):Jau-Wen Lin
學位類別:碩士
校院名稱:國立高雄應用科技大學
系所名稱:機械與精密工程研究所
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
中文關鍵詞:汽輪機葉片流固耦合ALE有限元素法數值分析
外文關鍵詞:steam turbinebladefluid-structure interactionsALE finite elementnumerical analysis
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汽輪機低壓葉片根部偶爾發現龜裂現象,而造成此現象可能原因在於不穩定的流體(unsteady flow)與葉片(blades)之間有交互作用,對於大展弦比(aspect ratio)的汽輪機低壓葉片,流場與結構的相互作用不可忽略。本文利用商業軟體ANSYS以ALE (Arbitrary Lagrangian-Eulerian)方法,對汽輪機低壓末次級葉片,進行流固耦合模擬數值分析。結果顯示,流體流動產生之壓力波衝擊誘發葉片振動,且葉片之最大應力發生於葉尾距離根部15 mm處,而最大位移點在葉尾頂。
The low-pressure blades crack near root location occurs occasionally in steam turbine. A possible occurrence of the blade failure is due to the interaction between unsteady flow and blades. The interaction between fluid field and structure should not be ignored for the low-pressure turbine blades with high aspect ratio. In this paper, solid-fluid interaction analysis of numerical simulated for the L-1 low-pressure turbine blades by using commercial software ANSYS with ALE (Arbitrary Lagrangian-Eulerian) method. The results showed that the blade vibration comes from the fluid flow generated impact pressure wave, and the maximum stress of blades occurred at the trail 15 mm from the root, and the largest displacement points at the top of the tail.
中文摘要 ------------------------------------------------------- i
英文摘要 ------------------------------------------------------- ii
誌謝 ------------------------------------------------------- iii
目錄 ------------------------------------------------------- iv
表目錄 ------------------------------------------------------- vi
圖目錄 ------------------------------------------------------- vii
符號說明 ------------------------------------------------------- ix
第一章、 緒論---------------------------------------------------- 1
1.1 前言---------------------------------------------------- 1
1.2 蒸汽渦輪葉片設計之基本考慮--------------------------------- 2
1.3 研究目的與動機------------------------------------------- 3
第二章、 文獻回顧與理論基礎---------------------------------------- 4
2.1 文獻回顧------------------------------------------------ 4
2.2 理論基礎------------------------------------------------ 7
2.2.1 質量守恆定律--------------------------------------------- 8
2.2.2 動量守恆方程式------------------------------------------- 9
2.2.3 能量守恆方程式------------------------------------------- 11
2.2.4 紊流傳遞方程式------------------------------------------- 12
2.2.5 基本控制方程的通用形式------------------------------------ 13
2.2.6 ALE(Arbitrary Lagrangian-Eulerian)--------------------- 15
第三章、 研究方法與電腦輔助工程分析--------------------------------- 16
3.1 葉片流固耦合數值分析研究方法------------------------------- 16
3.2 電腦輔助工程分析----------------------------------------- 19
3.2.1 建立幾何模型--------------------------------------------- 20
3.2.2 網格劃分------------------------------------------------ 21
3.2.3 求解設置------------------------------------------------ 25
3.2.4 結果後處理----------------------------------------------- 25
第四章、 數值模擬結果與分析---------------------------------------- 26
4.1 流場模擬計算結果與分析------------------------------------ 26
4.2 葉片模擬計算結果與分析------------------------------------ 42
第五章、 結論---------------------------------------------------- 50
參考文獻 ------------------------------------------------------- 52
附錄 ------------------------------------------------------- 57
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