Large eddy simulation on flow structure in centrifugal flow Tundish
Large eddy simulation on flow structure in centrifugal flow Tundish
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DOI：
10.2355/isijinternational.47.568
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发表时间：
2007-04
影响因子：
1.8
通讯作者：
Fang Wang;Baokuan Li;F. Tsukihashi
中科院分区：
文献类型：
--
作者：
Fang Wang;Baokuan Li;F. Tsukihashi
利用电磁力使钢水水平旋转的离心式中间包已被开发用于生产高质量、高生产率的钢水。由于旋转室内的旋流流动对离心流中间包的效果至关重要，因此寻求增强旋流流动的方法，了解离心流中间包内的流动结构是十分有益的。发展了大涡模拟(LES)技术来模拟复杂的流动。大涡模拟的计算强度比k-e大得多，成本也比直接数值模拟(DNS)低得多，但提供了对瞬变现象的一个新的洞察水平。本文对三种情况下的流动结构进行了模拟和分析，即：(A)由直接喷嘴产生的电磁力，(B)利用钢液高度势能产生的弯曲水口，(C)电磁力和弯曲水口的组合。旋流和旋涡清晰地显示出来。旋转室内最大涡流速度提高了17%，验证了弯曲喷嘴的有效性。
Centrifugal flow tundish which the molten steel is horizontally rotated by electromagnetic force has been developed to produce high quality steel with high productivity. Because the swirling flow in the rotation chamber is crucial for the effectiveness of centrifugal flow tundish, it is beneficial to search the way to enhance the swirling flow and understand the flow structure in centrifugal flow tundish. Large Eddy Simulation (LES) technique is developed to simulate the complicated flows. LES is computationally much more intensive than k-e and cost less than direct numerical simulation (DNS), but offers a new level of insight into transient phenomena. In the present works, flow structures in three cases are simulated and analyzed, i.e. the swirling flow is produced by (a) electromagnetic force with the direct nozzle, (b) bending nozzle using height potential energy of molten steel, (c) combination of electromagnetic force and bending nozzle. The swirling flow and vortices are clearly displayed. The effectiveness of bending nozzle is validated by 17% increment of maximum swirling velocity in rotation chamber.