本文是以實驗方法來探討一均勻穩定橫流通過彈性圓管管列，流體引致圓管振動的現象，在不同的參數下，主要有流速大小、紊流強度及圓管自然震動頻率，從流場觀測及流速量測兩個實驗量測來進行流場結構的分析、流體與圓管間穩定性的探討。接著探討抽掉圓管部分，以實驗結果跟未抽圓管的實驗部分作分析比較，探討抽掉圓管對流場分佈的改變及對鄰近圓管的影響，尋找抑制流場穩定並減低圓管振動的方法。

由實驗結果得知，在圓管未產生振動前，流場的變化只與流速有關，不受到圓管自然振動頻率的影響，流速在臨界速度以下時，第一列圓管的振動為最大且以X方向為主。流速超過臨界速度後，由於圓管尾流渦漩剝離作用的增強，第二列圓管的振動最大。在流場量測方面，隨著圓管間流速的增加其紊流擾動也增加，增加趨勢的近似一次線性關係，而且圓管自然振動頻率越高，其流場擾動越大。在頻譜分析方面，流速超過臨界速度後，流場中第一列圓管的流場頻率主要以圓管振動為主，振動頻率隨著流速的增加有微幅的增加。第二列圓管的流場頻率以渦漩頻率為特徵頻率，流場中渦漩的頻率隨著流速增大而加大，但未達到與圓管振動的頻率。

在比較抽掉圓管後對於流場及鄰近圓管振動的影響，得到抽掉圓管能夠大幅降低周圍流場的紊流擾動，但卻些微增加鄰近圓管的振動。若是當渦漩頻率達到與圓管自然振動頻率相同而產生共振時，抽掉圓管亦可以改變流場的St number，也就是改變了流場中渦漩的頻率，所以利用抽掉圓管改變流場頻率，避免共振而達到抑制圓管振動的效果。

Flow induced vibration of flow around a flexible tube array in cross flow are investigated experimentally. The different parameter including velocity, turbulent intensity, and nature frequency of tube. The flow structure and stability between flow and tube are analyzed by flow visualization and flow measurement. Further more, missing tube to find the change of the flow and the influenced of nearby tube, to get the way decreasing the vibration of tube.

目 錄
摘要…………………………………………………………….….i
目錄………………………………………………………………iii
圖目錄………………………………………………………..…...v
符號說明………………………………………………………...xiv
第一章 緒論………………………………………………………1
1-1前言…………………….…………………………………1
1-2文獻回顧……………………………………………….…2
1-3研究目的……………………………..……………………8
第二章 實驗設備、儀器與方法……………… …………………9
2-1實驗設備…………………………………………………...9
2-2實驗儀器…………………………………………………..11
2-3實驗方法…………………………………………………..13
第三章 結果與討論……………………………………………….15
3-1 不同圓管自然振動頻率對流場的影響…………………..15
3-2 抽掉圓管對流場的影響…………………………………...23
第四章 結論與建議……………………………..…………….……27
4-1 結論…………………………………………………………27
4-2 建議…………………………………………………………28
參考文獻…………………………………………………………….29
附錄…………………………………………………………………112

參考文獻

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