动力源火工品点火过程中主装药温度特性数值计算

Numerical Calculation of Temperature Character of Main Change in the Powered Initiators Ignition Process

为研究动力源火工品的点火过程,为其设计提供理论依据,采用数值模拟方法,根据热点火理论建立了描述点火过程的数学模型。通过数值积分得到了在不同点火源温度情况下主装药内部表面附近的温度分布曲线。由分布曲线得到:当点火源温度在2000～3600 K之间变化时,点火发生的位置离开主装药表面的距离在462.8～112.4μm之间,点火延迟期由8222μs缩短到264μs。结果说明点火源温度升高,点火延迟期缩短,当点火源温度升高到2800 K时,延迟时间缩短的趋势变得平缓。

In order to study the ignition process of powered initiators and provide theoretical base for the design of powered pyrotechnics,a mathematical model describing the ignition process was founded by numerical simulation method on the basis of thermal ignition theory.The interior temperature distributions nearby the main charge surface in condition of different ignition source temperature were obtained by means of numerical integral.The following results from distribution curves were obtained： when the ignition source temperature is from 2000 K to 3600 K,the ignition distance depart from main charge surface is from 462.8 μm to 112.4 μm.The ignition delayed time shortens from 8222 μs to 264 μs,indicating that the ignition delayed time shortens when the ignition source temperature increases.When the ignition source temperature goes to 2800 K,the trend of ignition delayed time shortening becomes flat.