不同热通量下炸药烤燃的数值模拟

Numerical Simulation of Cook-off for Explosive at Different Heat Fluxs

以固黑铝炸药为研究对象,针对炸药火烧的烤燃试验或可能受到意外热辐射的热安定性问题,建立了炸药热辐射的数值计算模型。采用计算流体力学软件ANSYS FLUENT,对几种不同的热通量104,105,106W·m-2下固黑铝炸药的热点火规律进行了计算,得到了固黑铝炸药的点火时间、点火温度及点火位置。计算结果表明,随着热通量的增大,炸药的点火时间逐渐缩短,点火时壳体的温度逐渐升高,热通量对炸药的点火温度影响不大,点火位置就在炸药柱的顶面中心。

A thermal reaction model of explosive was established for the cook-off test under the thermal condition of fire and thermal stability consideration of the explosive with the unexpected thermal radiation.The RDX-based cast cured alumnized（GHL）explosive was selected to investigate the characteristics of thermal ignition of the explosive at heat flux of 104,105,106W·m-2,respectively.The calculation is conducted by means of the CFD software（ANSYS FLUENT）and the time to ignition,the ignition temperature and the ignition location were obtained.Results show that the ignition time of explosive decreases and the shell temperature increases with increasing of heat flux.The ignition temperature is slightly affected by heat flux.The ignition location is center of the upper center of the explosive.