镁合金双辊薄带连铸熔池布流系统数理模拟研究
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摘要
随着材料科学的发展,镁合金在越来越多的领域具有无可比拟的优势,大到飞机,小到手机,镁合金的应用随处可见。但是,镁合金板带材的生产却有相当的难度,传统生产工艺存在工序多、成本高等问题。采用双辊薄带进行镁合金连铸能较好的解决传统工艺存在的不足。在双辊薄带连铸工艺中,铸机熔池布流系统对生产的薄带质量具有至关重要的影响,因此,研究双辊薄带熔池布流系统意义重大。
本文采用物理模拟和数值模拟相结合的方法研究了双辊薄带熔池内布流系统。基于相似原理,建立了1:1水力学模型,采用超声波浪高仪和电导仪测量了侧孔、边孔孔径和分配器直管长度等参数对熔池内的液面波动和熔池内上部区域混合状况的影响;并根据熔池内液面波动和流动混合状况对布流系统进行优选。此外,采用数学模拟的方法考察了几种较优布流系统的液面、熔池截面、熔池对称面、熔池纵向1/4处截面和边孔所在截面的流场和速度场,从而对物理模拟实验结果进行了补充和验证。
物理结果表明,布流系统有侧孔时,熔池的混合更好,同时液面波动也较大;圆筒形布流系统的边孔孔径越大,则液面的波动和熔池上部区域的混合都相对减弱;槽形布流系统分配器直管由55mm改成45mm时,熔池液面扰动减小;同时,由熔池的液面波动和熔池上部区域混合可知,形状为圆形、边孔孔径为13mm、边孔在圆筒的1/2处、并且有侧孔的布流系统为优选的最佳布流系统。根据数学模拟可知,优选的圆筒形布流系统的熔池流场均匀、温度分布合理;数学模拟结果与物理模拟结果能够较好的吻合。
With the development of material science, magnesium alloys have great advantages in more and more field. Magnesium alloys are applied in various industries, such as the manufacturing of planes and mobile phones. However, the production of magnesium alloy sheets has a considerable difficults. When using two-roll thin strip continuous casting produce magnesium alloys, that would be better to solve the shortcomings of traditional technology. In the twin-roll thin strip continuous casting process, metal delivery system have a crucial effect with quality of thin strip, therefore, it is a great significance to research metal delivery system of twin-roll thin strip continuous casting pool.
In this paper, using physical and numerical simulation method research metal delivery system of twin-roll thin strip continuous casting pool. Based on similar principles, established a 1:1 water model, and using an ultrasonic level detector and a conductometer measurement, study was performed about the influence of lateral hole, side hole aperture and the length of distribution device straight pipe and other parameters on level fluctuation and fluid mixed of the upper pool region; and in accordance with level fluctuation and fluid mixed of the upper pool region conditions to choose optimization metal delivery system. In addition, using numerical simulation method investigate the flow field and velocity field of liquid Level, pool section, pool symmetrical face, pool vertical 1/4 section and side hole section of several optimum metal delivery system, so as to supplemented and verified the physical simulation results.
Physical simulation results indicating metal delivery system with lateral hole, the pool was mixed better, at the same time level fluctuation also larger; side hole of cylindraceous metal delivery system was larger, level fluctuation and fluid mixed of the upper pool region was relatively weaker; The length of distribution device of sulciform metal delivery system changed from 55mm into 45mm, level fluctuation disturbance decreases; at the same time, choosed the optimum metal delivery system according to level fluctuation and fluid mixed of the upper pool region, shape cylindraceous,13mm diameter side hole, side hole in the cylinder of 1/2,and has lateral hole was the optimum metal delivery system. Based on numerical simulation indicates pool of the optimum cylindraceous metal delivery system’s flow field uniformity, temperature distribution reasonable; numerical simulation and physical simulation was in good coincidence.
本文采用物理模拟和数值模拟相结合的方法研究了双辊薄带熔池内布流系统。基于相似原理,建立了1:1水力学模型,采用超声波浪高仪和电导仪测量了侧孔、边孔孔径和分配器直管长度等参数对熔池内的液面波动和熔池内上部区域混合状况的影响;并根据熔池内液面波动和流动混合状况对布流系统进行优选。此外,采用数学模拟的方法考察了几种较优布流系统的液面、熔池截面、熔池对称面、熔池纵向1/4处截面和边孔所在截面的流场和速度场,从而对物理模拟实验结果进行了补充和验证。
物理结果表明,布流系统有侧孔时,熔池的混合更好,同时液面波动也较大;圆筒形布流系统的边孔孔径越大,则液面的波动和熔池上部区域的混合都相对减弱;槽形布流系统分配器直管由55mm改成45mm时,熔池液面扰动减小;同时,由熔池的液面波动和熔池上部区域混合可知,形状为圆形、边孔孔径为13mm、边孔在圆筒的1/2处、并且有侧孔的布流系统为优选的最佳布流系统。根据数学模拟可知,优选的圆筒形布流系统的熔池流场均匀、温度分布合理;数学模拟结果与物理模拟结果能够较好的吻合。
With the development of material science, magnesium alloys have great advantages in more and more field. Magnesium alloys are applied in various industries, such as the manufacturing of planes and mobile phones. However, the production of magnesium alloy sheets has a considerable difficults. When using two-roll thin strip continuous casting produce magnesium alloys, that would be better to solve the shortcomings of traditional technology. In the twin-roll thin strip continuous casting process, metal delivery system have a crucial effect with quality of thin strip, therefore, it is a great significance to research metal delivery system of twin-roll thin strip continuous casting pool.
In this paper, using physical and numerical simulation method research metal delivery system of twin-roll thin strip continuous casting pool. Based on similar principles, established a 1:1 water model, and using an ultrasonic level detector and a conductometer measurement, study was performed about the influence of lateral hole, side hole aperture and the length of distribution device straight pipe and other parameters on level fluctuation and fluid mixed of the upper pool region; and in accordance with level fluctuation and fluid mixed of the upper pool region conditions to choose optimization metal delivery system. In addition, using numerical simulation method investigate the flow field and velocity field of liquid Level, pool section, pool symmetrical face, pool vertical 1/4 section and side hole section of several optimum metal delivery system, so as to supplemented and verified the physical simulation results.
Physical simulation results indicating metal delivery system with lateral hole, the pool was mixed better, at the same time level fluctuation also larger; side hole of cylindraceous metal delivery system was larger, level fluctuation and fluid mixed of the upper pool region was relatively weaker; The length of distribution device of sulciform metal delivery system changed from 55mm into 45mm, level fluctuation disturbance decreases; at the same time, choosed the optimum metal delivery system according to level fluctuation and fluid mixed of the upper pool region, shape cylindraceous,13mm diameter side hole, side hole in the cylinder of 1/2,and has lateral hole was the optimum metal delivery system. Based on numerical simulation indicates pool of the optimum cylindraceous metal delivery system’s flow field uniformity, temperature distribution reasonable; numerical simulation and physical simulation was in good coincidence.
引文
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