臺灣博碩士論文加值系統

本研究以物理模型以及數值模擬方式針對薄鋼胚連鑄模內部的流場以及熱場進行研究。在物理模型實驗中，以0.5比例建立一套水模系統並搭配3種注嘴，探討不同設計的注嘴對連鑄模內部流場的影響。為了更真實的模擬實際連鑄模，在水模外圍建立一套製冷系統，使流動的水受冷而產生凝固現象，以更真實地模擬鋼液於結晶器內的流動行為。根據實驗結果可以得知水模內部具有4個渦流區，當改變注嘴的傾斜角度以及改變注嘴的插入深度時，會造成渦流區位置的變動。在冷卻實驗中，連鑄模寬面凝固層的成長並不會對連鑄模內部四個渦流區造成巨大的變化。
在數值模擬方面，藉由數值模擬軟體ProCAST模擬物理實驗中連鑄模內部的流場和熱場變化，並將模擬結果和實驗結果做比對，證明此套模擬系統可進行流場與熱場耦合以及凝固層成長的數值模擬，再以此套模擬系統搭配實際連鑄冷卻條件，預測實際連鑄模內部的流場以及凝固層厚度。

In this study, a physical model and a mathematical model have been developed to analysis the flow field and thermal field in the funnel-type mold of thin slab continuous casting. In the physical model experiment, a 0.5 scale model is used to analysis the influences of flow field with three types of nozzle. In order to simulate the real situation of thin slab continuous casting, a cooling system is built around the water model to cool down the mold and grow the solidification shell in the water model. By using this cooling system, the change of flow characteristic with solidification shell can be observed. According to the experiment results, there are four swirls in the mold and the positions of the swirls change by using different nozzles. In the cooling experiment, the existence of solidification shell does not affect the formation of swirls in the mold.
In the mathematical experiment, the commercial software ProCAST is used to simulate the process of physical model experiment. The simulate results of thermal field and flow field are compared with the results of physical model and then confirm this mathematical model is reliable. Finally, this mathematical model with the actual casting cooling conditions is employed to predict the actual flow field and the solidified layer thickness inside the mold.

摘要 I
Abstract II
致謝 III
目錄 IV
表目錄 VII
圖目錄 VIII
符號表 X
第一章 緒論 1
1.1 研究背景 1
1.2 文獻回顧 3
1.2.1 薄鋼胚連鑄 3
1.2.2 物理模型試驗 5
1.2.3 數值模擬 6
1.3實驗目的 9
第二章 理論基礎 13
2.1 物理模型試驗 13
2.2 數值模型試驗 16
2.2.1 流動控制方程式 17
2.2.2 熱傳控制方程式 18
第三章 實驗方法與步驟 20
3-1 物理模型試驗 20
3.1.1實驗設備 21
3.1.2操作條件與實驗步驟 23
3-2 數值模型試驗 25
3.2.1 物理現象 25
3.2.2 模型簡化與假設 25
3.2.3 初始條件和邊界條件設定26
3-3 薄鋼胚連鑄數值模擬 27
3.3.1 物理現象 28
3.3.2 模型簡化與假設 28
3.3.3 初始條件與邊界條件 28
第四章 結果與討論 44
4-1 水模流場 44
4-2 流場數值模擬 45
4-3 冷模實驗 46
4-4 冷模實驗數值模擬 48
4-5 薄鋼胚連鑄數值模擬 50
第五章 結論 71
第六章 未來方向 73
參考文獻 74

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