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首页> 外文会议>First International Conference on Computational Methods in Materials Characterisation; Santa Fe, New Mexico >Polyurethane foam response to high heat fluxes
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Polyurethane foam response to high heat fluxes

机译：聚氨酯泡沫对高热通量的响应

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摘要

A Simple PolyUrethane Foam (SPUF) mass loss and response model has been developed to predict the behavior of unconfined, rigid, closed-cell, polyurethane foam-filled systems exposed to fire-like heat fluxes. The model is based on simple two-step mass loss kinetics using distributed Arrhenius reaction rates. The initial reaction step assumes that the foam degrades into a primary gas and a reactive solid. The reactive solid subsequently degrades into a secondary gas. The SPUF decomposition model was implemented into the finite element (FE) heat conduction codes COYOTE and CALORE, which support chemical kinetics and dynamic enclosure radiation using "element death." A discretization bias correction model was parameterized using elements with characteristic lengths ranging from 1-mm to 1-cm. Bias corrected solutions using the SPUF response model with large elements gave essentially the same results as grid independent solutions using 100-μm elements. The response model was used to simulate a 9-cm diameter, 15-cm tall cylinder of foam that was heated with lamps. The predictions of the decomposition front locations were compared to the front locations determined from real-time X-rays. The predictions of the front locations were similar to the measured front locations using real time X-rays.
机译：已开发出一种简单的聚氨酯泡沫（SPUF）质量损失和响应模型，以预测暴露于火样热通量的无限制，刚性，闭孔，聚氨酯泡沫填充系统的行为。该模型基于使用分布式Arrhenius反应速率的简单两步质量损失动力学。初始反应步骤假定泡沫降解为主要气体和反应性固体。反应性固体随后降解为次级气体。 SPUF分解模型已实现为有限元（FE）导热代码COYOTE和CALORE，它们使用“元素死亡”来支持化学动力学和动态围护辐射。使用特征长度在1毫米至1厘米范围内的元素对离散化偏差校正模型进行参数化。使用带有较大元素的SPUF响应模型进行偏差校正的解决方案，其结果与使用100μm元素的独立于网格的解决方案的结果基本相同。响应模型用于模拟直径9厘米，高度15厘米的泡沫圆柱体，该圆柱体用灯加热。将分解前沿位置的预测与从实时X射线确定的前沿位置进行比较。前方位置的预测与使用实时X射线测量的前方位置相似。

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