Thermal safety of modular charge which is fed into and retained in the chamber after gun fires consecutively is first investigated with cook-off method. A two-dimensional cook-off model of modular charge in gun chamber is established and the cook-off process of modular charge in gun chamber is numerically simulated. Then the effects of module number and firing condition on charge thermal safety are evaluated by researching the cook-off response characteristics of modules. The results show that, under conditions of different module numbers the cook-off responses all occur on the module closest to the boundary of missile, and the single-base propellants located at the inner surface of cartridge ignite first. When the number of loaded module changes from 1 to 6, the cook-off response temperatures vary little, only in a small range of 478.1 K–482.4 K. The cook-off response times decrease logarithmically in the range of 211.2 s–166.7 s with the increasing length of residual air gap in gun chamber. The simulation results are well matched with the experimental data. Furthermore, different firing conditions have great influence on the cook-off response time, minor influence on the initial response position and little influence on the response temperature. Under the three conditions of consecutive 32 launches with 5 rounds/min, 43 launches with 1 round/min, and 41 launches with different firing frequencies, the cook-off response temperatures are 479.2 K, 481.1 K and 479.9 K respectively and the response times are 709.2 s, 211.2 s and 214.4 s respectively. The response position is near the middle area of the inner cartridge surface in the former condition and near the right area in the latter two conditions.

首先用蒸煮法研究了在连续开火后进入并保留在燃烧室中的模块化装药的热安全性。建立了炮膛模块化装药的二维熄火模型，对炮膛模块化装药的熄火过程进行了数值模拟。然后通过研究模块的熄火响应特性，评估模块数量和点火条件对充电热安全性的影响。结果表明，在不同模块编号条件下，熄火响应均发生在离导弹边界最近的模块上，位于弹药筒内表面的单基推进剂最先着火。当加载模块的数量从 1 变为 6 时，蒸煮响应温度变化不大，仅在 478.1 K–482.4 K 的小范围内。随着枪膛内残余气隙长度的增加，熄火响应时间在 211.2 s–166.7 s 范围内呈对数递减。仿真结果与实验数据吻合较好。此外，不同的烧制条件对熄火响应时间影响较大，对初始响应位置影响较小，对响应温度影响较小。在连续 32 次 5 发/min 发射、43 次 1 发/min 发射和 41 次不同发射频率发射 3 种工况下，熄火响应温度分别为 479.2 K、481.1 K 和 479.9 K，响应时间分别为 709.2 秒、211.2 秒和 214.4 秒。