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研究生:李永泰
研究生(外文):Yong-Tai Lee
論文名稱:外加震動波形變化對液柱斷裂之影響
論文名稱(外文):The Influence of External Excited Waveform on Liquid Jet Breakup
指導教授:林大惠林大惠引用關係
指導教授(外文):Ta-Hui Lin
學位類別:碩士
校院名稱:國立成功大學
系所名稱:機械工程學系碩博士班
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:2002
畢業學年度:90
語文別:中文
論文頁數:116
中文關鍵詞:震盪波形壓電衛星液滴液柱斷裂
外文關鍵詞:vibrationwaveformpiezoelectricsatellite dropletsliquid jet breakup
相關次數:
  • 被引用被引用:2
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  • 收藏至我的研究室書目清單書目收藏:0
本研究以可程式函數產生器將方波加以修改並經由壓電液滴產生器對液柱產生對應之液滴斷裂,藉以觀察在不同波形效應影響之下自由液柱的斷裂模式與其斷裂後衛星液滴的產生,探討在特殊的波形效應差異對於斷裂行為的影響,實驗中並觀察液柱在受到不同波形效應振盪下斷裂時之斷裂長度。進而尋求一最佳之外加擾動波形,以得到最穩定之液滴粒徑及均勻間距之液滴串。
實驗結果顯示,外加震波波形之不同,液柱斷裂後的液滴群組組成有形成均勻的液滴分佈,或是在主液滴之間另具有衛星液滴等數種型態,其型態的形成原因則和液柱斷裂時的形狀具有直接的關係。
實驗中另就自由液柱受到外加方波可產生均勻斷裂的頻率附近採取另一組頻率,利用此頻率的方波對自由液柱作震盪,可使液柱產生具有衛星液滴的非均勻斷裂,在此情形下採取不同的合成波形震盪模式操作條件,尋求一最佳之外加擾動波形,使得在低速噴流的應用中能夠得到預期液滴粒徑及均勻間距之液滴串。
實驗結果顯示間歇式波形效應不同之試驗波形對液柱加以震盪下,於液柱斷裂部位並未發生第二次斷裂或是產生衛星液滴,其具有改善液柱斷裂之效果。
In order to observe the liquid jet breakup and the formation of satellite droplet after breakup under the influence of different waveforms, a programmable function generator was used to modify square waves and to drive a piezoelectric droplet generator. The influence of a particular waveform on the breakup length and the breakup type of a liquid jet were studied.
The results demonstrate that with different applied vibrating waveform, there are four basic breakup types of a liquid jet, namely, X, A, V and O. Whether the pattern of droplet series after liquid jet breakup results in even size and spacing droplets, or has various patterns of satellite droplets between the main droplets, is directly related to the liquid jet breakup type.
At a frequency at which square wave vibration would result in uneven breakup droplet pattern with satellite droplet, we take different modified waveforms to vibrate the liquid jet and search for a better waveform to eliminate the satellite and to obtain uniform droplet size and even spacing. We found that an intermittent square wave can give the best result.
摘要 Ⅰ
英文摘要 Ⅱ
致謝 Ⅲ
總目錄 IV
圖目錄 Ⅵ
符號說明 XIII
一、前言 1
1-1 液柱破裂現象 1
1-2 波長和噴流液柱直徑之影響 4
1-3 方波以及正弦波在液柱上的傳遞現象 6
1-4 研究目的 8
二、實驗設備與儀器 9
2-1 供水系統 9
2-2 影像擷取系統 10
2-3 示波器監視系統 11
2-4 壓電液滴產生器 11
2-5 可程式函數產生器 12
2-6 可程式函數產生器控制程式軟體操作與調整步驟 14
三、實驗方法與步驟 19
3-1 實驗參數 19
3-2 外加音波震盪液柱斷裂實驗研究方法 22
3-3 找尋最佳斷裂液滴實驗研究方法 23
3-4 誤差分析 24
四、外加音波震盪液柱斷裂觀測 25
4-1 原始波形設定 25
4-2 液柱斷裂類型分類 26
4-3 階梯效應觀測 30
4-3-1 之波形對液柱斷裂型態觀測 31
4-3-2 之波形對液柱斷裂型態觀測 32
4-3-3 之波形對液柱斷裂型態觀測 34
4-3-4 之波形對液柱斷裂型態觀測 35
4-4 非對稱波形效應觀測 37
4-4-1 正負振幅作用時間不同下,不具作動延滯時間 37
4-4-2 正負振幅作用時間不同下,具有作動延滯時間 39
4-5 間歇式波形效應觀測 41
4-6 諧和波疊加產生改變第二振幅之波形效應觀測 42
五、找尋最佳斷裂液滴測試 44
5-1 試驗波形類型 44
5-2 液柱斷裂型態觀測 45
六、結論 47
七、參考文獻 50
八、圖形 53
九、附錄 100
十、附錄圖形 103
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