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本文提出了 Ap 基复合推进剂点火的一个综合模型及其数值解。这一分析模拟位于滞止区的推进剂试样在快速加压条件下的点火过程。本模型的特点包括:a)考虑了 Ap 基复合推进剂点火的详细的化学动力学资料;b)推进剂几何形状是二维(轴对称)的;c)考虑了气相中压力迅速增加对点燃过程的影响。使用隐式有限差分格式求解瞬态二阶联立、非齐次、非线性偏微分控制方程组。数值解揭示在点火阶段顺序发生的一系列重要事件,包括:点火器气体流入接近样品表面的区域;压缩波到达处未燃成份的燃烧;向推进剂传热;氧化剂和燃烧剂的高温分解;气相反应导致点燃。这个模型正确地预测了实验观察到的现象:随着增压速率提高,点火延迟时间缩短。采用文中考虑的不同点火准则都得到和试验一样的趋势。
In this paper, an integrated model of ignition of Ap-based composite propellant and its numerical solution are proposed. This analysis simulates the ignition process of a propellant sample located in a stagnant zone under rapid pressurization conditions. The characteristics of the model include: a) detailed chemical kinetic data taking into account the ignition of the Ap-based composite propellant; b) the propellant geometry is two-dimensional (axisymmetric); c) the rapid increase in pressure in the gas phase The impact of the process. Implicit finite difference scheme for solving transient second order simultaneous, nonhomogeneous and nonlinear partial differential equations. The numerical solution reveals a series of important events that occur sequentially in the ignition phase, including: ignition gas flowing into the area near the sample surface; combustion of unburned components at the arrival of compressional waves; heat transfer to propellants; pyrolysis of oxidants and combustion agents; Gas phase reaction leads to ignition. This model correctly predicts what the experiment observes: as the rate of pressurization increases, the ignition delay time is reduced. Using the different ignition criteria considered in this paper, we get the same trend as the test.