TNT装药渗出过程的数值模拟

Numerical Simulation of Leakage Process of TNT Charges

根据溶解—扩散—解吸的基本微观过程,基于Fick定律和双膜理论建立了TNT装药渗出的数学模型。利用该模型对一维情况下水下及空气中爆炸物装药主要成分TNT通过橡胶材料的渗出过程进行了数值仿真,得到了材料内不同时刻的炸药浓度分布以及稳定后炸药渗出的扩散通量,仿真结果与文献[8]中的实验数据吻合,验证了该模型的合理性。对炸药的包覆材料厚度及外围介质等影响渗出的主要因素进行了仿真分析,结果表明TNT炸药在水中比在空气中更容易渗出。

A mathematical model for leakage of TNT charges is built based on Fick＇s law and the two-film theory in accordance with the basic process of dissolution-diffusion-desorption. This model is used to simulate numerically the leakage processes of TNT through rubber material both under water and in the air in the case of one-dimension, and the concentration distributions of explosive charges in the material at different times and the stable diffusion flux are obtained. The simulation results are consistent with the experimental data in the literature. The rationality of the model is verified. The main factors affecting the leakage process, such as coating material thickness and external medium, are analyzed. The results show that the leakage of TNT under water is easier than in the air.