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首页> 外文会议>Fourth International Conference on Advanced Computational Methods in Heat Transfer held in Udine, Italy, in July 1996 >Numerical modeling of heat-up and emlting processes in internally heated debris bed and reactor vessel lower plenum
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Numerical modeling of heat-up and emlting processes in internally heated debris bed and reactor vessel lower plenum

机译：内部加热的碎屑床和反应堆容器下部增压室中加热和渗出过程的数值模型

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摘要

The paper considers the two-dimensional thermal processs in internally heated oxidic debris beds in the lower plenum of a light water reactor vessel during the course of severe accidents with core meltdown and relocation. Heat transfer and phase change processes in debris beds and vessel lower head wall are investigated numerically with a particular emphasis on the dynamic characteristics of theral transients in question. The main purpose of the work is to develop an appropriate modeling approach, which enables the analysis of complicated physical processes (involving dynamic changes of bed porosity, anisotropic heat transfer in remelting beds with internal energy sources) in complex domains of debris bed and vessel lower head wall. The natural convection heat transfer in the forming melt pools are described by means of an originally developed effective conductivity-convectivity approach. A multi-block control-volume numerical scheme for two-dimensional cartesian or cylindrical non-orthogonal geometries has been developed and applied to predict heat transfer in the solid or porous core debris beds and forming melt pools.
机译：本文考虑了轻水反应堆容器下部充气室内内部加热的氧化碎屑床中的二维热过程，该过程在堆芯熔化和重定位的严重事故过程中发生。数值研究了碎屑床和容器下端壁的传热和相变过程，特别着重于所讨论的瞬变的动态特性。这项工作的主要目的是开发一种合适的建模方法，该方法能够分析碎屑床和容器下部复杂区域中的复杂物理过程（涉及床孔隙度的动态变化，重熔床中的各向异性传热）。头墙。通过最初开发的有效电导率-对流性方法描述了成形熔池中的自然对流传热。已经开发了用于二维笛卡尔或圆柱非正交几何形状的多块控制体积数值方案，并将其应用于预测固体或多孔芯碎屑床中的热传递并形成熔池。

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