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標題: | 渦漩式霧化裝置之理論分析暨實驗探討 |
作者: | Yi-Hai Liann 練懿海 |
指導教授: | 周賢福 |
關鍵字: | 霧化,液膜,渦漩式,粒徑, swirl atomizer,film thickness,droplet size,spray cone angle, |
出版年 : | 2005 |
學位: | 碩士 |
摘要: | 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. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/38467 |
全文授權: | 有償授權 |
顯示於系所單位: | 機械工程學系 |
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