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薄板坯连铸结晶器内流体流动特征的研究 总被引:2,自引:0,他引:2
在水力学模型实验的基础上,对初选的喇叭型、直通型和牛鼻子型3种超薄型水口进行结晶器流场激光测试,定量的研究直弧形截面薄板坯连铸结晶器内流体流动特征和水口出口速度分布,为进一步采用数学模型研究结晶器流场、优化伸入式水口结构和工艺参数打下基础。 相似文献
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本文讨论了珠钢CSP薄板坯高速连铸过程的凝固传热模型,同时通过采用“射钉法”测定二冷区不同位置的凝固坯壳厚度,验证理论研究与实际测量结果的一致性。 相似文献
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ZHU Miao-yong WANG Jun ZHANG Ying 《钢铁研究学报(英文版)》2005,12(6):14-19
SymbolList Ab,An———Surfaceareaofbroadfaceandnarrowfaceof moldrespectively,m2;Cp———Effectiveheatcapacity,J·kg-1·K-1;Cp,s———Heatcapacityofsolidphase,J·kg-1·K-1;Cp,l———Heatcapacityofliquidphase,J·kg-1·K-1;Cw———Waterheatcapacity,J·kg-1· 相似文献
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《Canadian Metallurgical Quarterly》2013,52(3-4):213-228
AbstractThis study describes the numerical modeling of three-dimensional coupled turbulent flow, heat transfer, and solidification in a continuous slab caster for stainless steel. The model uses generalized transport equations which are applicable to the liquid, mushy and solid regions within the caster. The turbulent characteristics in the melt pool and mushy region are accounted for using the low-Reynolds number k–ε turbulence model by Launder and Sharma. This version of the low-Reynolds number turbulence model is found to be more easily adaptable to the coupled flow and mushy region solidification caster problem compared to the standard high-Reynolds number and other low-Reynolds number turbulence models. The macroscopic solidification process itself is based on the enthalpy-porosity scheme. The governing transport equations are solved employing the primitive variables and using the control volume based finite-difference scheme on a staggered grid. The process variables considered are the casting speed and the inlet superheat of the melt. The effects of these process variables on the velocity and temperature distributions and on the extent of the solidification and mushy regions are reported and discussed. The numerical predictions of solidification profile are compared with the limited experimental data available in the literature, and very good agreement was found. © 1998 Canadian Institute of Mining and Metallurgy. Published by Elsevier Science Ltd. All rights reserved. Résumé Cette étude decrit la modélisation numerique de l'écoulement turbulent couple, à trois dimensions, du transfert de chaleur et de la solidification, lors du coulage en continu de dallé d'acier inoxydable. Le modéle utilisé des equations generalisées de transport qui sont applicables aux regions liquides, pateuses et solides à l'interieur de l'equipement de coulage. On tient compte des caractéristiques turbulentes du bain fondu et de la région pateuse en utilisant le modéle de turbulence a petit nombre de Reynolds k–ε, de Launder et Sharma. Cette version du modèle de turbulence à petit nombre de Reynolds est plus facilement adaptable à l'écoulement couple et la solidification de la région pateuse du problème de coulage que la version utilisant un nombre de Reynolds normal, élevé, ou que d'autrés modèles de turbulence à petit nombre de Reynolds. Le procédé meme de solidification macroscopiqué est base sur la combinaison enthalpié-porosite. On resout les équations de transport qui gouvernent en employant les variables primitives et enutilisant la mèthode des différences finies basée sur le volume de contrôle, sur une grille alterne. Les variables considerées dans ce procédé sont la vitesse de coulage et la surchauffe du liquide a l'entrée. On rapporte et discute de l'effet de ces variables du procédé sur la distribution de velocité et de température et sur l'étendue des régions solides et pateuses. On compare les prédictions numériqués du profil de solidification avec les données expérimentales limitées disponibles dans la litterature et on trouvé une très bonne concordance. © 1998 Canadian Institute of Mining and Metallurgy. Published by Elsevier Science Ltd. All rights reserved. 相似文献
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薄板坯连铸结晶器铜板温度及热流密度分布 总被引:5,自引:1,他引:4
薄板坯连铸结晶器的传热过程直接影响到铜板的寿命,有必要研究薄板坯连铸结晶器的传热特征。为了研究薄板坯结晶器的热流密度,通过开发的结晶器温度监测软件检测了珠钢结晶器铜板的温度。根据在线实测的铜板温度以及薄板坯连铸机冷却参数,建立了薄板坯结晶器铜板传热模型,计算并验证了结晶器热流密度的分布函数,同时通过二次回归得出了结晶器热流密度与结晶器高度的关系式。结果表明,在宽度方向上铜板温度和热流密度的分布具有相似的规律性,距离弯月面越近,热流密度和温度的波动越大。弯月面处热流密度值大于4.2MW/m^2,是造成结晶器铜板被侵蚀的主要原因。 相似文献
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为了解决H型钢连铸坯表面裂纹问题,结合凝固理论建立了H型钢连铸结晶器内钢水凝固传热模型,并应用大型有限元软件ANSYS对钢水凝固传热过程进行模拟求解,描述和分析了凝固坯壳的温度分布、坯壳生长历程及各工艺因素对钢传热行为、凝固行为的影响,为制定合理的工艺参数、提高铸坯质量、减少漏钢发生提供了理论依据。 相似文献
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Flow instability in continuous thin slab casting moulds has been studied using a full scale water model with particle image visualization. The results show that jet impinging depth, circumfluence centre position and wave height are unsteady and periodical. The probabilities of jet impinging depth and circumfluence centre position seem to be Poisson distributions with the highest frequency near the average position. The flow pattern is asymmetrical for a short time and the phase difference of jet impinging depth, circumfluence centre position and wave height on the two sides of the mould centreline is half a period. The average jet impinging depth, average circumfluence centre position, average meniscus wave profile and the highest and lowest meniscus positions are generally symmetrical to the mould centreline. 相似文献
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为研究结晶器内钢液流场,通过对工艺参数的优化,进一步提高铸坯质量,以天津钢铁集团有限公司4#-VAI板坯连铸结晶器为原型进行水模试验,通过调节拉速、水口浸入深度,研究了结晶器内流场形态、液面波动、流场冲击深度和保护渣形貌等的变化情况。模拟试验表明,在现有参数和水口尺寸情况下,结晶器流场合理、液面渣层平稳、坯壳厚度均匀,能够满足铸坯质量要求。 相似文献
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Thin slab casting forms the most important development in continuous casting of the past two decades. Within a short period of time the technology developed into a serious alternative for conventional slab casting, both with respect to productivity and product quality. Corus implemented the technology in its Direct Sheet Plant (DSP) enabling the production of thin‐gauged coils. The development of thin slab casting technology has not come to an end yet. Further increase in productivity can be expected still respecting high quality standards. The control of the mould fluid flow is one of the key technologies for thin slab casting. Here not only the (complex) design of the submerged entry nozzle is important. A strong interaction exists with the shaping of the funnel mould and the layout of the electromagnetic brake (EMBR). Modern physical and numerical modelling techniques enable a detailed design study of all aspects of the process. This resulted in a new design of the EMBR for the DSP thin slab caster, based on a multi‐pole approach. One pole is controlling the symmetry of the flow, where another two poles control the speed of the liquid steel in the meniscus area. By using this technology the operational window can be enlarged significantly without deterioration of the situation in the mould. 相似文献