【摘要】 优化连铸结晶器内流场有助于提升钢产品质量。文章通过大涡模拟(Large Eddy Simulation, LES)模型数值模拟结晶器内流场，并利用水模型观察射流现象验证LES模型；引入涡构判定Ω准则识别涡构，模拟连铸结晶器垂直段处涡构，分析结晶器内的瞬态流形变化、涡构演变和传热过程，揭示结晶器内强、弱相干涡的形成和转变过程。结果表明：结晶器内传热、流动反映出非对称分布；连铸结晶器内沿宽面方向，随钢液流动向下方向，钢液温度和流速逐渐降低，且非均匀性逐渐减弱；连铸拉速为1.3 m/min且浸入式水口流体射流冲击窄面时，有利于结晶器窄面处的铸坯坯壳形成，同时又保证了结晶器液面流动的合理性；LES模型提供了一种连铸过程内瞬态流动及传热过程数值模拟方法，相比于传统雷诺时均模型，在预测精准度上更具有优势。更多还原

【Abstract】 Optimizing the flow field within a continuous casting mold is essential for improving the quality of steel products. In this study, the flow field inside the mold was numerically simulated using a Large Eddy Simulation(LES) model, and a water model was employed to observe the jet phenomenon for validating the LES results.The Ω-criterion was introduced to identify vortex structures, enabling the simulation of vortices in the vertical section of the mold. The study analyzes transient flow dynamics, vortex evolution, and heat transfer processes, and reveals the formation and transformation of strong and weak coherent vortices within the mold. The results show that both heat transfer and flow within the mold exhibit asymmetric distributions. Along the wide face of the mold, as the molten steel flows downward, its temperature and velocity gradually decrease, and flow non-uniformity diminishes. At a casting speed of 1.3 m/min, when the jet from the submerged entry nozzle impacts the narrow face, it facilitates the formation of a solidified shell along the narrow face, while also maintaining reasonable surface flow in the mold. The LES model provides a robust approach for simulating transient flow and heat transfer in the continuous casting process, demonstrating higher predictive accuracy compared to traditional Reynolds-Averaged Navier-Stokes(RANS) models.更多还原