Abstract A universal cookoff model (UCM) is applied to the melt cast explosive Comp-B composed of RDX and TNT. The UCM uses a simple kinetic mechanism with rates and thermophysical properties determined specifically for Comp-B. The success of the UCM is primarily attributed to the flexible form of the rate expression as well as accurate thermophysical properties obtained from small-scale experiments. The rate expressions use distributed activation energies in conjunction with rate multipliers to account for accelerations caused by 1) dissolved RDX, 2) liquid RDX, and 3) pressure. Our finite element model addresses Comp-B cookoff from the pristine state, through melting of the TNT binder, partial dissolution of RDX in the hot TNT, and melting of the remaining RDX as the Comp-B thermally ignites. Typically, the UCM is used for explosives that do not flow. However, we have included a buoyancy-driven flow model to account for multiphase fluid movement. Predicted temperature fields were sensitive to flow, which caused the hotter material to rise. Our predictions of ignition times were also sensitive to RDX dissolving in hot TNT causing an acceleration of the RDX decomposition.

中文翻译：

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熔铸炸药的烹饪模型 (Comp-B)

摘要 对RDX和TNT组成的熔铸炸药Comp-B应用了通用烹饪模型（UCM）。UCM 使用简单的动力学机制，其速率和热物理特性是专门为 Comp-B 确定的。UCM 的成功主要归功于速率表达式的灵活形式以及从小规模实验中获得的准确热物理特性。速率表达式使用分布式激活能和速率乘数来解释由 1) 溶解的 RDX、2) 液体 RDX 和 3) 压力引起的加速度。我们的有限元模型通过 TNT 粘合剂的熔化、RDX 在热 TNT 中的部分溶解以及 Comp-B 热点燃时剩余 RDX 的熔化，解决了 Comp-B 从原始状态开始的烹饪问题。通常，UCM 用于不流动的炸药。然而，我们已经包含了一个浮力驱动的流动模型来解释多相流体运动。预测的温度场对流动很敏感，这会导致较热的材料上升。我们对点火时间的预测也对 RDX 溶解在热 TNT 中导致 RDX 分解加速很敏感。