共查询到18条相似文献,搜索用时 171 毫秒
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数值模拟了板坯结晶器内钢液的综合冶金行为.结果表明:钢水的流动状态主要决定于浸入式水口钢水射流形态和强度.在已经给定浸入式水口工作端的条件下,由于水口吐出孔附近存在低压抽引回流区,所以钢水仅从吐出孔下部流出,降低了水口吐出孔的有效利用面积.大断面会使其弯月面的过热度降低;坯壳温度变化主要集中在窄面冲击区域,该区域坯壳温度随铸坯断面增加而降低.断面尺寸为1 400 mm×230 mm和1 600 mm×230 mm的铸坯,结晶器出口处窄面凝固坯壳厚度能达到11.5 mm;对于1 800 mm ×230 mm断面在结晶器出口处窄面凝固坯壳厚度能达到13.4 mm.铸坯宽面坯壳厚度受断面变化的影响很小. 相似文献
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底吹工艺在电弧炉炼钢过程中的应用能有效缩短熔池混匀时间, 加速碳、磷、硫的去除, 提高生产效率及产品质量.本文利用数值模拟软件模拟了EBT (偏心底部出钢) 区底吹孔不同气体流量下的电弧炉钢液速度场, 发现当EBT区域底吹气体流量从100 L·min-1升至267 L·min-1 (其他两孔气体流量稳定保持为133 L·min-1) 时, EBT区域钢液的平均流速由2.805×10-3m·s-1升至3.268×10-3m·s-1, 钢液整体平均流速由4.126×10-3m·s-1升至4.610×10-3m·s-1, 并耦合得出EBT区域不同底吹流量下的钢液流动速度经验公式.由于钢液流动是影响熔池内反应的动力学因素, 本文提出了电弧炉炼钢基于底吹熔池搅拌的碳成分预报模型, 为冶炼终点均匀熔池成分、合理供氧操作提供理论建议. 相似文献
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通过计算得出在浇注过程中连铸中间包包壁瞬态热量损失作为边界条件的基础上,建立了连铸中间包内钢液流动与传热耦合数学模型,对连浇过程中中间包内非稳态的温度场和流场进行了数值模拟,考察了中间包连浇5个包次过程中钢液热量损失、温度分布以及流场情况,为现场操作和工艺优化提供依据和指导。 相似文献
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Three-dimensional mathematical model coupling of the molten steel flow and heat transfer in the slab continuous casting mold and secondary cooling zone is established to describe molten steel flow and heat transfer phenomena in the slab continuous casting mold with EMBR.The computational model is applied to investigate the flow field and temperature field in slab mold contrast with and without a constant EMBR,which strength measured at a steel plant.The study shows that The EMBR has not changed the mold steel flow field characteristic.But it has reduced the intensity of the upper and downer recirculation in the mold,reduced the speed of the upper recirculation zone,increase the free surface temperature which is compared to the state without EMBR. 相似文献
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Kestur Sadashivaiah Keerthiprasad Mysore Seetharam Murali Pudukottah Gopaliengar Mukunda Sekhar Majumdar 《Metallurgical and Materials Transactions B》2011,42(1):144-155
In a centrifugal casting process, the fluid flow eventually determines the quality and characteristics of the final product.
It is difficult to study the fluid behavior here because of the opaque nature of melt and mold. In the current investigation,
numerical simulations of the flow field and visualization experiments on cold models have been carried out for a centrifugal
casting system using horizontal molds and fluids of different viscosities to study the effect of different process variables
on the flow pattern. The effects of the thickness of the cylindrical fluid annulus formed inside the mold and the effects
of fluid viscosity, diameter, and rotational speed of the mold on the hollow fluid cylinder formation process have been investigated.
The numerical simulation results are compared with corresponding data obtained from the cold modeling experiments. The influence
of rotational speed in a real-life centrifugal casting system has also been studied using an aluminum-silicon alloy. Cylinders
of different thicknesses are cast at different rotational speeds, and the flow patterns observed visually in the actual castings
are found to be similar to those recorded in the corresponding cold modeling experiments. Reasonable agreement is observed
between the results of numerical simulation and the results of cold modeling experiments with different fluids. The visualization
study on the hollow cylinders produced in an actual centrifugal casting process also confirm the conclusions arrived at from
the cold modeling experiments and numerical simulation in a qualitative sense. 相似文献
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在分析氧化铝回转窑传热过程的基础上,运用多相流理论对回转窑内横截面物料流动与传热过程进行数值模拟,研究了不同工况下横截面上的温度分布及流动情况。结果表明,截面上物料温度主要受气体及窑壁传热影响,物料颗粒越小,其内部温度上升越快,流动带起的物料高度也越低,但截面上物料内部温度分布基本趋于一致,并可忽略截面温差。 相似文献
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根据Froude数相似准则,做了铝铸轧铸咀型腔体流动的水模拟实验,其结论:现有 咀出口处熔体流动速度相对误差达19%以上,不能满足超薄快速铸轧工艺的需要。 相似文献
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