目前核能電廠的建築強度足以因應地震帶來的危害，甚至能夠在災害當下成為附近居民的避難所，但針對反應爐爐心中流體受到地震影響相關的文獻仍然不多，尤其爐心中因燃料棒的設置使其成為複雜的平行通道，震動對於平行通道的影響相關的研究相對更少。本研究針對平行通道沸騰雙相流進行探討，因此規劃的測試條件包含3種進口溫度、9種進口流量及數種熱通量，共有35組的測試條件，這些測試條件能更進一步地被區分成穩定及不穩定的狀態，兩種不同穩定性則是被分別探討，接著引入2種不同的振動頻率(1.06, 1.6Hz)施加於通道上，透過參數之平均值及標準差的變化了解兩種不同穩定性在受到外部振動的影響，以及利用快速傅立葉轉換來觀察壓差、溫度及空泡分率的頻譜表現來探討在同時受到外部振動與不穩定性的影響，最後發現三者振盪振幅皆會受到外部振動的影響而改變，不過壓差主要受到外部振動主導而變化，溫度與空泡分率則受到不穩定性主導。另外觀察不穩定振盪頻率的變化及針對實驗系統繪製穩定性邊界圖，得出不穩定振盪頻率與熱質通量比呈現正比關係，穩定性邊界圖則可被劃分成穩定、不穩定及暫態變化三區。希望本研究對於平行通道的研究能夠添加更多可靠的實驗數據，能夠與相關的模擬結果互相驗證，並應用在爐心流體的安全分析上。

At present, the construction of nuclear power plants is sufficient to cope with the damage caused by earthquakes. Even more, it can be a sanctuary for nearby residents during the disaster. However, there is insufficient literature about the effects of earthquakes on the core in reactor to date. Especially, the arrangement of fuel rods makes the core form a complicated parallel-channel, and the research about the impact of vibration on parallel-channel is more scarcely. This study discussed the boiling two-phase flow in parallel-channel. The test conditions included 3 inlet temperatures, 9 inlet flow rate, and several heat fluxes. There were totally 35 groups of test condition, and these conditions could be divided into stable and unstable states. Two different vibration frequencies(1.06, 1.6Hz) were introduced to the parallel-channel. It could be understand that different stability influenced by vibration through the variation of average and standard deviation of all parameters. Then, Fast Fourier Transform(FFT) was used to analyze the spectrum of differential pressure, temperature, and void fraction. It was observed that all three parameters would be changed by vibration. Differential pressure was dominated by vibration while temperature and void fraction were dominated by instability. In addition, the variation of unstable oscillation frequency was analyzed and the stable boundary was obtained. It was found that unstable oscillation frequency was proportional to heat-to-mass flux ratio and stable boundary could be divided into three areas. According the result, the study of parallel-channel could add more reliable data which could be verified with relevant simulation results, and it can be applied in safety analysis in the future.

摘要 i
Abstract ii
誌謝 iii
目錄 iv
表目錄 vii
圖目錄 viii
符號說明 xiii
第一章 緒論 1
1.1 研究背景 1
1.2 雙相流介紹 2
1.3 地震介紹 4
1.4 論文結構 7
第二章 文獻回顧 8
2.1 絕熱雙相流實驗與流譜建立 8
2.1.1 矩形管絕熱雙相流 8
2.1.2 圓形管絕熱雙相流 11
2.2 單一通道沸騰雙相流 13
2.3 振動對於雙相流之影響 14
2.4 平行通道雙相流 17
2.5 平行通道之穩定性分析 20
第三章 實驗系統設計 31
3.1 平行通道沸騰雙相流振動實驗系統 31
3.1.1 水溫控制及供給系統 32
3.1.2 實驗管道系統 32
3.1.3 加熱系統 33
3.1.4 振動平台系統 36
3.1.5 訊號量測與數據擷取系統 38
3.2 實驗步驟 40
3.3 實驗範圍 41
第四章 結果與討論 45
4.1 訊號校正與轉換 45
4.1.1 壓力訊號校正實驗 45
4.1.2 溫度訊號校正實驗 46
4.1.3 空泡分率訊號校正實驗 48
4.2 穩定與不穩定之沸騰雙相流 51
4.2.1 穩定與不穩定沸騰雙相流之判定 51
4.2.2 穩定流動與不穩定流動之變化分析 55
4.3 外部振動與平行通道沸騰雙相流之變化 57
4.3.1 受外部振動影響之穩定沸騰雙相流 59
4.3.2 受外部振動影響之不穩定沸騰雙相流 62
4.3.3 快速傅立葉轉換與頻譜分析 65
4.4 平行通道沸騰雙相流之穩定性分析 69
4.4.1 外部振動與不穩定振盪頻率 69
4.4.2 不穩定振盪頻率變化與穩定性邊界 72
第五章 結論與未來建議 78
5.1 結論 78
5.2 未來建議 79
參考文獻 80

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