周賢福臺灣大學：機械工程學研究所練懿海2007-11-282018-06-282007-11-282018-06-282005http://ntur.lib.ntu.edu.tw//handle/246246/61196本文藉由理論與實驗探討渦漩式霧化裝置在不同幾何與操作壓力之效能。在渦漩腔內以質能守恆做出流場推導；於噴嘴外則援引Squire的液膜振幅成長速率分析液膜碎裂之物理現象。藉由在文中對控制體積(control volume)、初始條件、模型修正之物理假設，可直接自理論預測霧化裝置之液膜厚度、速度分佈、噴霧角度、粒徑尺寸。本研究所進行之實驗與理論相互比較，亦應證了理論之趨勢。藉由軟體MATLAB之輔助，可求得渦漩腔中速度與邊界層厚度之趨勢分布。最後，本文期望以個別不同幾何設計參數之改變與所對應之流數使渦漩霧化噴霧裝置的效率最佳化。Theoretical and experimental studies have been made to investigate the influence of atomizer construction and controlled pressure difference of swirl atomizers. The analysis of fluid field in the swirl chamber is governed by mass/energy conservation rules; in the region outside the nozzle, the analysis of oscillation of liquid sheet is based on Squire`s expression for the amplitude growth rate. With some physical assumptions of control volume, initial values and model correlation, analytical results make it possible to predict film thickness, velocity distribution, spray cone angle and droplet size directly. A series of experiments have been carried out to support and compare the theoretical results. The pictures for velocity profile and boundary layer thickness in the swirl chamber have been established with the aid of MATLAB. Finally, it has been recognized that the change of different individual design parameter and its corresponding flow number would still be a way to optimize the performance of swirl atomizers.目 錄 致謝………………………………………………………………ii 中文摘要………………………………………………………………iii 英文摘要………………………………………………………………iv 目錄………………………………………………………………v 表目錄………………………………………………………………… vii 圖目錄…………………………………………………………………vii 符號說明………………………………………………………xi 第一章 緒論 1-1 前言………………………………………………..….………1 1-2 研究背景與原理 ………………………………….…………1 1-3 文獻回顧………………………………………...……………3 1-4 研究目的 ……………………………………….……………7 第二章 研究理論基礎 2-1 系統之假設…………………………………………………8 2-2 系統與控制體積區域………………………………………9 2-3 渦漩霧化裝置內之分析……………………………………10 2-4 液膜自噴嘴至霧化之分析…………………………………13 2-5 噴嘴出口噴霧錐角度之分析……………………………17 第三章 實驗設備與步驟 3-1 實驗設備………………………………………………18 3-2 實驗步驟………………………………………………19 第四章 分析/實驗結果與討論 4-1 理論分析與預測……………………………………………23 4-1-1 工作流體速度分量……………………………………24 4-1-2 渦漩腔邊界層厚度……………………………………25 4-1-3 噴霧角度………………………………………………26 4-1-4 粒徑尺寸………………………………………………27 4-2 實驗分析部份…………………………………………27 4-2-1 控制參數探討圓柱形式噴霧裝置的效能……………27 a. 出口噴嘴直徑之影響…… …………………………28 b. 渦漩式組件之影響…………………………….……29 c. 驅動壓力之影響………………………………..…...30 d. 粒徑量測點之影響…………………..……………...31 4-2-2 平板式噴霧裝置之效能……………………………...32 4-3 誤差討論與比較……………………………………………33 4-4 最佳化設計之探討………………………………………36 第五章 結論與未來展望 5-1 結論………………………………………………………38 5-2 建議與未來展望…………………………………………41 REFERENCES…………………………………………………………42 附表…………………………………………………………………445465995 bytesapplication/pdfen-US霧化液膜渦漩式粒徑swirl atomizerfilm thicknessdroplet sizespray cone angle[SDGs]SDG7thesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/61196/1/ntu-94-R92522119-1.pdf