Kinetic Modeling of Liquid Phase RDX Thermal Decomposition Process and its Application in the Slow Cook-Off Test Prediction,Propellants, Explosives, Pyrotechnics

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Kinetic Modeling of Liquid Phase RDX Thermal Decomposition Process and its Application in the Slow Cook-Off Test Prediction
Propellants, Explosives, Pyrotechnics ( IF 1.7 ) Pub Date : 2021-03-16 , DOI: 10.1002/prep.202000291
Jiangshan Gu ₁ , Huabo Li ₁ , Xiaoqiao Zhao ₁ , Wenqian Wu ₁ , Wanghua Chen ₁ , Penggang Jin ₂ , Liping Chen ₁

Affiliation

RDX is an important and commonly used energetic material. The understanding thermal decomposition process of RDX is of great significance for the safety of its production, storage, and use. However, due to the coupling of phase transition and thermal decomposition process, a multi-step kinetic model including melting and decomposition process has not been established so far, which is not helpful to the prediction of its thermal behavior in different conditions. In this paper, Differential Scanning Calorimetry was used to measure the decomposition characteristics of RDX at different heating rates. A four-step consecutive reaction model A→A_liq→B→C→D was established to depict the melting and decomposition process. Then quench and reheat experiments were performed to determine the types of each step, where the reaction types are autocatalytic except that the step of B→C is an N-order reaction. The model was used to predict the result of slow cook-off test. It was found that the predicted time of thermal explosion is 0.2 h earlier than the experiment and the onset temperature is 0.6 °C smaller than experiment, which verifies the rationality of the kinetic model.

中文翻译：

液相RDX热分解过程动力学建模及其在慢速烹饪试验预测中的应用

RDX是一种重要且常用的含能材料。了解RDX的热分解过程对其生产、储存和使用的安全具有重要意义。然而，由于相变和热分解过程的耦合，目前还没有建立包括熔化和分解过程的多步动力学模型，不利于预测其在不同条件下的热行为。本文采用差示扫描量热法测量了RDX在不同升温速率下的分解特性。一个四步连续反应模型 A→A _liq建立→B→C→D 来描述熔化和分解过程。然后进行淬火和再加热实验以确定每个步骤的类型，其中反应类型为自催化，但B→C步骤为N级反应。该模型用于预测慢炖测试的结果。发现热爆预测时间比实验提前0.2 h，起始温度比实验小0.6 ℃，验证了动力学模型的合理性。

更新日期：2021-03-16

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