Abstract
Experimental studies of the flow of liquid metal in CCM mold are long, complex and labor consuming process. Therefore, mathematical modeling by numerical methods is increasingly used for this purpose. The article considers a new technology for liquid metal supply into a mold. The authors present original patented design of the device, consisting of direct-flow and rotating bottom nozzles. The main results of investigations of the melt flow in the mold are considered. The objects of research were hydrodynamic and heat flows of liquid metal at new process of steel casting into a CCM mold of rectangular section. The result is spatial mathematical model describing flows and temperatures of liquid metal in the mold. To simulate the processes occurring during metal flow in the mold, special software was designed. Theoretical calculations are based on fundamental equations of hydrodynamics, equations of mathematical physics (equation of heat conduction taking into account mass transfer) and proven numerical method. The area under study was divided into elements of finite dimensions; for each element, resulting system of equations was written in difference form. The results are fields of velocities and temperatures of metal flow in the mold volume. A calculation program was compiled based on developed numerical schemes and algorithms. An example of calculation of steel casting into a mold of rectangular cross-section, and flow diagrams of liquid metal along various sections of the mold are given. Vector flows of liquid metal in different sections of the mold are clearly presented at different angles of rotation of the deep-bottom nozzle. The authors have identified the areas of intense turbulence. Metal flows of the described technological process were compared with traditional metal supply through a fixed bottom nozzle.
Highlights
Получение непрерывнолитого слитка с качественной структурой начинается при заливке жидкого металла в кристаллизатор установки непрерывной разливки стали (УНРС)
Жидкий металл из ковша через погружной прямоточный стакан поступает в плавающий глуходонный стакан квадратного поперечного сечения, откуда через эксцентричные окна выходит в кристаллизатор
Металла в кристаллизаторе происходит во много раз более интенсивно, чем при сравниваемом процессе выхода металла в кристаллизатор из погружного стакана, но без вращения
Summary
Получение непрерывнолитого слитка с качественной структурой начинается при заливке жидкого металла в кристаллизатор установки непрерывной разливки стали (УНРС). The result is spatial mathematical model describing flows and temperatures of liquid metal in the mold. В настоящей работе представлены результаты исследования кинематики потоков жидкого металла по всем другим сечениям кристаллизатора. Постановочные инженерные и математические части задачи в основном изложены в работе [25], в которой в графическом виде представлена схема процесса разливки жидкого металла в кристаллизатор при свободном вращении погружного стакана.
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