臺灣博碩士論文加值系統

中文摘要
本實驗研究利用穩態紅外線熱像儀技術量測靜態與旋轉狀態S-型急彎方形雙流道壁端之詳細紐塞數分佈(Nu)、管道范寧摩擦係數(f)與熱性能係數(TPF)。實驗檢測之雷諾數(Re)、旋轉數(Ro)以及浮力數(Bu)範圍分別為5000<Re<30000、0<Ro<0.5、0.0049<Bu<0.15，分析雷諾數(Re)、旋轉數(Ro)及浮力數(Bu)對迎風面與背風面熱傳性能造成之各別及耦合影響。透過沿著進/出管道S-流道以及180°急彎所導引之截面渦流促進管核與近壁區域之動量/熱通量傳遞，S-型急彎方形雙流道之紐塞數(Nu)與范寧摩擦係數(f)均自直管紊流域之Nu∞與f∞值提昇。於5000<Re<30000範圍，靜態管道(Nu) ̅_0/(Nu) ̅_∞比值介於4.33-2.9之間，而相對應之f ̅_0/f_∞比值介於10.09-6.85，基於定泵功率條件計算靜態管道熱性能係數(TPF)則介於1.43-1.49之間。於5000<Re<30000、0<Ro<0.5、0.0049<Bu<0.15之測試條件，旋轉S-型急彎方形雙流道迎風面與背風面之((Nu) ̅/(Nu) ̅_0)分別介於2.34-0.93與2.25-0.91之間；旋轉迎風面內側壁范寧摩擦係數(fLe,I)、外側壁范寧摩擦係數(fLe,O)與端壁面范寧摩擦係數(fLe,E)分別介於0.316-0.094、0.286-0.078和0.316-0.094之間；而旋轉背風面之內側壁(fTr,I)、外側壁(fTr,O)與端壁面(fTr,E) f值，則分別介於0.299-0.87、0.311-0.084與0.309-0.086之間，相對應旋轉管道之TPF值為1.25-2.02，因此證明S型急彎雙流道應用於旋轉渦輪動葉冷卻為兼具高傳熱效率及高熱傳率被動式熱傳強化裝置。為提供渦輪動葉冷卻系統於設計階段應用本研究發展之S-型急彎雙流道，本研究建立熱傳與壓損數據庫，並據以推導區域平均熱傳係數與壓損係數之實驗公式，供驗證CFD結果與內冷卻流道設計使用。

關鍵詞：旋轉S型急彎雙流道、 渦輪動葉冷卻。

Abstract

This experimental study adopted the infrared thermography method to detect the detailed endwall Nusselt number (Nu) distributions for a static and rotating S-shaped two-pass smooth channel with the associated Fanning friction factors (f) and thermal performance factors (TPF) measured. With the experimental data generated at the test conditions of 5000<Re<30000, 0<Ro<0.5 and 0.0049<Bu<0.15, the isolated and combined effects of Reynolds number (Re), rotation number (Ro) and buoyancy number (Bu) on leading/trailing Nu and f properties were analyzed. With the sectional multi-vortices induced by the S-pathways to promote the near-wall fluid momentum/heat exchanges, both Nu and f levels for present S-shaped two-pass smooth channel were elevated from the straight-pipe developed turbulent flow references Nu∞ and f∞. With 5000<Re<30000, the static-channel Nusselt number ratios ( ) were in the range of 4.33-2.9 with the corresponding f0/f∞ ratios between 10.09 and 6.85, giving the TPF values between 1.43-1.49. At present rotating test conditions, the leading and trailing endwall Nusselt number ratios ( ) were in the respective ranges of 2.34-0.93 and 2.25-0.91. The f factors for the rotating leading inner, outer and end walls were in the respective ranges of 0.316-0.094, 0.286-0.078 and 0.316-0.094. For the rotating trailing inner, outer and end walls, the f factors were between of 0.299-0.87, 0.311-0.084 and 0.309-0.086, respectively. With the overall channel averaged TPF values between 1.25 and 2.02, present rotating S-shaped two-pass smooth square channel was suitable to provide efficient HTE benefits for cooling of a gas turbine rotor blade. To assist design applications using present S-shaped rotating two-pass channel, the Nu and f data base, as well as the responsive empirical correlations were generated; which can also be adopted for CFD validations.

Keywords: Rotating S-shaped Two-Pass Channel, Gas Turbine Rotor Blade Cooling.

目錄
中文摘要 I
英文摘要 III
符號說明 IV
第一章 前言 1
1-1研究背景 1
1-2渦輪葉片內冷卻系統研究回顧 9
1-3研究動機 26
第二章 實驗方法 29
2-1研究方式 29
2-2實驗設備 34
2-3實驗步驟與規劃 42
2-4 實驗數據分析 43
第三章 結果與討論 47
3-1 S型急彎雙通道靜態管道熱傳特性 47
3-1.1 S型急彎雙通道靜態管道壓損與熱性能係數 53


3-2 S型急彎雙通道旋轉管道熱傳特性 56
3-2.1 Ro數與Bu數對旋轉管道紐塞數分佈產生之影響 59
3-2.2科氏力與浮力數對於管道區域熱傳係數分佈之影響 63
3-2.3旋轉管道熱傳數據參數分析 67
3-3.4旋轉管道范寧摩擦係數與熱性能係數 75
第四章 結論 81
參考文獻 83

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