噴流管藉由管內壓力噴灑出液體或氣體，常因噴嘴堵塞使流體無法均勻噴灑，影響噴流管噴灑液體功效。噴流裝置主要包含圓管與流道兩大部分，本文應用有限元素方法分析管內壓力所導致之圓管表面應變分佈，求得對壓力變化最靈敏之監控位置，並與實驗量測值比較。先以應變規建立管內壓力與圓管表面應變之實驗關係式，結果顯示噴流管壓力與圓管表面應變具線性關係。噴嘴堵塞實驗結果顯示堵塞一、二、三個噴嘴可使管內壓力分別增加14.3、42.5和98.2kPa；圓管應變分別增加-128.7、-389.6和-876.9με。再將感測器變更為光纖光柵，藉由光柵反射光波長變化與光強度變化，量測噴流管壓力變化與噴嘴堵塞狀況。實驗結果顯示噴流管壓力與光柵反射光波長變化為線性關係，但卻與光強度變化呈現非線性關係，堵塞一、二、三個噴嘴可使光柵反射光波長分別增加-0.091、-0.249和-0.6nm。綜上所述，噴嘴堵塞對管內壓力與表面應變之影響非常顯著，本文應用應變規與光纖光柵量測噴流管表面應變變化，可有效監控管內壓力變化，並可用以評估噴嘴堵塞狀況。

In a spray system, fluid either gas or liquid can be sprayed through a pressurized pipe. As the nozzles are blocked, it may cause a non-uniform spray. In this study, the spray system contains a flow pipe with 12 flow channels. The strain distribution along the pipe is calculated by the finite element method. The location which is most sensitive to the pipe pressure can be identified through the strain distribution. A linear relationship between the pipe pressure and strain is obtained using the strain gauge. As the numbers of nozzles being blocked are 1, 2 and 3, the pipe pressures are increased by14.3、42.5和98.2kPa, respectively; while the pipe strains are increased by-128.7、-389.6和-876.9με, respectively. In this work, fiber Bragg grating is the alternative sensor used to detect the pipe pressure and the number of nozzle being blocked. A linear relationship between the pipe pressure and the shift of Bragg wavelength is achieved. Experimental results show that as the number of nozzles being blocked increases by 1, 2 and 3, the shift of Bragg wavelength is increased by-0.091、-0.249和-0.6nm, respectively. Present investigation demonstrates that both the strain gauge and fiber Bragg grating are capable of monitoring the pipe pressure and the number of nozzles being blocked.

書名頁 I
口試論文審定書 II
授權書 III
中文摘要 IV
英文摘要 V
致謝 VI
目錄 VII
表目錄 IX
圖目錄 XI
第一章 緒論 1
1.1 前言 1
1.2 文獻回顧 1
1.3 研究方法 5
第二章 實驗設備及測量系統設計 6
2.1 實驗設備 6
2.2 量測系統設計 7
第三章 噴流管幾何結構、材料性質及有限元素分析 9
3.1 噴流管幾何結構 9
3.2 噴流管楊氏係數 9
3.2.1 圓管結構楊氏係數 11
3.2.2 流道結構楊氏係數 12
3.3 噴流管應變分佈 13
第四章 噴流管壓力與應變及噴嘴堵塞關係 14
4.1 實驗量測方式與步驟 14
4.2 噴流管內壓力與應變 14
4.3 噴嘴堵塞與噴流管內壓力及應變關係 16
第五章 光纖光柵感測系統 19
5.1 布拉格條件(Bragg Condition) 19
5.2 機械應變所產生的光柵反射光波長偏移量 20
5.3 光纖光柵感測方式 21
5.4 光纖光柵實驗設備 22
第六章 光纖光柵感測噴流管壓力 25
6.1 噴流管內壓力與光纖光柵反射光波長關係 25
6.2 噴流管內壓力與光纖光柵反射光波長關係式驗證 26
6.3 噴流管內壓力與光纖光柵反射光強度電壓關係 27
6.4 噴流管內壓力與光纖光柵反射光強度電壓關係式驗證 29
第七章 應用光纖光柵感測噴嘴堵塞 31
7.1 波長法感測噴嘴堵塞 31
7.2 光強度法感測噴嘴堵塞 33
第八章 結論 36
參考文獻 38

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