臺灣博碩士論文加值系統

摘要

對於燃氣渦輪機燃燒器的性能與環保改善，燃油噴射和霧化的過程是重要的因素，而其中空氣式噴嘴是燃油供應和產生噴灑與霧化的一個主要方法。因此在工業界有大量的資源用在空氣式噴嘴的設計，但對於燃油噴灑霧化的物理過程並不太瞭解，特別是靠近噴嘴的主要霧化區。一個完整的霧化燃燒模式必須能解決連續液體薄膜運動行為、在兩相界面上的波動力學、以及主要與次要斷裂的霧化機制等問題，本研究主要是針對這些問題，結合圓錐液膜運動模式與兩相界面的不穩定波動力分析，建立一個空氣式噴嘴的霧化模式。
在本研究中，首先建立液膜動力模式，其包含旋性中空圓錐形與非旋性鐘形之兩種環狀液膜噴流。再來以表面波穩定理論為基礎，來分析表面不穩定波的成長率與液膜厚度、速度、黏度、表面張力及燃燒室內壓力的關係。進而聯結液膜動力模式與液膜表面波不穩定分析，建立液膜的主要霧化模式，可預測液膜流動結構(包含：液膜速度、噴灑角度和液膜厚度等)和主要霧化性質(包含：液膜斷裂長度與液滴尺寸)。最後與其他實驗數據比較，來驗証本研究模式的計算結果。

Abstract

Fuel jet and atomization process are important factors to improve the performance and emission pollution of the gas turbine combustor. Airblast nozzle is a main way to supply fuel and to produce spray with atomization. Therefore, there has been great quantity of resources used for designing airblast nozzles in the industry. However, the physics process of fuel spray is still not fully understood, especially in the primary atomization area near the nozzle. A complete atomization combustion model must be provided to resolve these problems, including continuous liquid film motion, wave mechanics on the two-phase interface, and atomization mechanism of primary and second breakup. In the present study, cone film motion model will be coupled with wave dynamics model on the two-phase interface for instability analysis in order to establish a atomization model of airblast nozzle.
In the present study, liquid film dynamics model will be first set up for two annular liquid film jets of swirling hollow cone shape and non-swirling bell shape. Then, based on the surface wave theory, the growth rates of unstable wave on the surface will be analyzed, which are related to liquid film thickness, velocity, viscosity, surface tension, and pressure in the combustion chamber. The liquid film dynamics model and liquid film surface wave analysis are combined to establish primary atomization model of liquid films, which can predict liquid film flow structure (i.e. film velocity, spray angles, and film thickness etc.) and atomization characteristics (i.e. film breakup length and droplet size). Finally, comparison with other experiment data will be made to verify the calculated results of present study model.

目錄
中文摘要
英文摘要
目錄------------------------------------------------------------------ Ⅰ
圖目錄---------------------------------------------------------------- Ⅱ
符號說明-------------------------------------------------------------- Ⅴ
第一章 簡介----------------------------------------------------------- 1
1-1 研究動機---------------------------------------------------------- 1
1-2 文獻回顧---------------------------------------------------------- 5
1-3 研究目標---------------------------------------------------------- 12
第二章 研究方法------------------------------------------------------- 14
2-1液膜動力模式------------------------------------------------------- 14
2-2液膜表面波不穩定理論----------------------------------------------- 22
2-3液膜斷裂與霧化模式------------------------------------------------- 26
2-4模式聯結程序------------------------------------------------------- 32
第三章 結果與討論----------------------------------------------------- 35
3-1環狀液膜動力分析--------------------------------------------------- 35
3-2液膜表面波不穩定分析----------------------------------------------- 46
3-3空氣式噴嘴霧化分析------------------------------------------------- 53
第四章 結論與建議----------------------------------------------------- 68
4-1結論--------------------------------------------------------------- 68
4-2建議--------------------------------------------------------------- 70
參考文獻-------------------------------------------------------------- 72

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