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NIPPON STEEL TECHNICAL REPORT No. 89 January 2004 - 46 - UDC 621 . 746 . 27 : 681 . 3 *1Environment the darker the area, the larger the value. It is seen in the figure that the whole molten steel in the mold is significantly disturbed by the in- flux from the nozzle. It is considered that the turbulence becomes significant as the speed of the incoming flow becomes high, show- ing itself as the rippling of the molten steel surface. As stated above, it has been demonstrated that a molten steel flow analysis model enables a realistic mold level control simulation reflecting the turbulence of molten steel flow. 5. Closing A mold level control model applying molten steel flow analysis has been formulated, and thus a realistic mold level control simula- tion reflecting the turbulence of molten steel flow has been made possible. The effectiveness of the developed model has been con- firmed through simulations. A mold level control system based on the developed model will be designed for application to high-speed casting operation, and its effectiveness will be evaluated through tests in actual operation. References 1) Suzuki, D. et al.: Level Control Model by Numerical Fluid Dynamics Method. Proceedings of the Fourth International Conference on Intelli- gent Processing and Manufacturing of Materials. IPMM03. 2003(CD- ROM) Fig. 8 Mold steel level chart in commercial operation Fig. 9 Average molten steel level in mold (analysis) Fig. 10 Standard deviation of molten steel level in mold (analysis) 2.5 2.0 1.5 1.0 00.51.01.5 N X Fig. 11Distribution of time average of molten steel flow rate at mold thi
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