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Simulation of Mould Level Velocities During Continuous Casting of Round Bloom Strands With Mould-Electromagnetic Stirring

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Journal of Iron and Steel Research International 2012年第S2期19卷 884-887页

作者： BARNAMartin JAVUREK Mirko REITER Jurgen WATZINGER Josef KAUFMANN Bernhard hackl gemot Institute for Fluid Mechanics and Heat Transfer Johannes-Kepler-University-Linz Voestalpine Stahl Donawitz GmbH and Co KG Siemens VAI Metals Technologies GmbH and Co Voestalpine Stahl GmbH RHI AG Technology Center Leoben

In modern continuous casting of round steel blooms rotating electromagnetic fields are commonly employed to improve the product ***-electromagnetic stirrers(M-EMS)are used to excite a rotary motion along the solidification front in the liquid *** velocities lead to a better strand surface quality as well as enhancing the transition from columnar to equiaxed *** the usage of electromagnetic stirrers is widespread,not all effects are fully known or *** to harsh conditions at the plant,measurements are scarce and *** model experiments-an established alternative for investigating continuous casting of steel-cannot be used due to the low electrical conductivity of *** with liquid metals like mercury,Galinstan or Wood’s metal are either expensive or difficult to *** numeric simulations are essential to gain a better understanding of the processes involved in continuous casting with electromagnetic *** numeric simulations should always be validated with experiments and/or *** the velocity field inside the liquid core of the bloom cannot be measured at the caster,the velocity at the mould level can be measured by dipping a nail into *** skull forming at the tip of the nail is directly linked to the occurring surface *** measurements can then be compared with numeric simulations of the nail dipping *** numeric model is restricted to the upper part of the *** lower part of the strand is also taken into account through adjusted boundary conditions(velocity field *** from a simulation of the whole strand).In this work the influence of the stirring field strength on the simulation results will be *** the future these nail dipping simulations will be validated with plant *** can then to a certain extentvalidate the simulation of the strand with M-EMS too,as it serves as the basis for the nail dipping model.

关键词： continuous casting of steel mould-electromagnetic stirring velocity measurements finite volume method

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