圓胚連鑄之凝殼厚度與介在物軌跡模擬分析

Analysis of Shell Thickness and Inclusions Trajectory in Continuous Casting of Round Billet

張雅琪(Ya Chi Chang)；林惠娟(Huey-Jiuan Lin)；高子棋(Zi Qi Gao)；陳冠宥(Kuan Yu Chen)；吳鉉忠(Hsuan Chung Wu)；謝合彥(Ho Yen Hsieh)；陳政文(Cheng Wen Chen)；許明豪(Ming Hao Xu)

連續鑄造 ； 熱流場分析 ； 數值模擬

鑄造工程學刊

49卷2期（2023 / 12 / 01）

19 - 26

繁體中文;英文

圓胚連鑄是一個重要的鋼鐵生產過程，不僅生產效率高，而且可以得到均勻的結構和良好的機械性能。融熔鋼液從分配器經由鑄嘴注入鑄模內，經由鑄模的冷卻逐漸形成凝殼；而鋼液在鑄模內的流動方式和冷卻的均勻性是影響鋼坯質量的重要因素。因此，了解與控制鑄模內流場與溫度成為一重要的研究議題。由於連鑄過程之鑄模內熱流場分析是一個包括多相流動和固液相變化等現象的複雜系統，所使用的模擬技術必須能夠耦合多相流動、固液相變化和連續提取等現象。本研究採用ANSYS Fluent建立三維瞬態熱流模型，結合UDF程式計算凝殼厚度及評估介在物移動軌跡，模擬結果可以分析不同操作條件下的凝殼厚度、捲渣量及介在物捕捉等現象，進而用以建立最佳之操作參數。

Continuous casting of round steel billet is an important steel production process that not only offers high production efficiency, but also yields uniform structure and good mechanical properties. The molten steel is injected into the mold from tundish through the nozzle, and the solidified shell is gradually formed through mold cooling. The flow pattern and the uniformity of cooling in the mold are important factors affecting the quality of the steel billet. Therefore, understanding and controlling the flow field and temperature in the mold become an important research topic. Due to the complexity of the thermal flow field in the continuous casting process, which involves multiphase flow and solid-liquid phase changes, the simulation technology used must be able to couple phenomena such as multi-phase flow, solid-liquid phase changes and continuous pulling. In this study, a three-dimensional transient thermal flow model was established using ANSYS Fluent, combined with User-Defined Function (UDF) programs to calculate the shell thickness and evaluate the trajectory of the inclusions. The simulation results can analyze phenomena such as shell thickness, the amount of slag entrainment, and the capture of inclusions under different operating conditions. The results could be applied to establish optimal operating parameters.