不同射击工况下膛内模块装药的热安全性预测

为研究火炮多发连续射击情况下模块装药滞留膛内的热安全性问题,建立了膛内模块装药二维非稳态烤燃模型,采用FLUENT软件对模块装药在膛内的烤燃过程进行了数值模拟,分析了3种射击工况下多发连续射击后继续装填模块装药留膛时的烤燃特性。结果表明,常温下不同射击工况对膛内模块装药的烤燃响应时间影响较大,对烤燃起始响应位置影响较小,对烤燃响应温度几乎无影响;采用5发/min射速射击32发后模块装药的烤燃响应时间为399.2s,采用1发/min射速射击43发和采用混合射速射击41发后模块装药的烤燃响应时间分别为176.4s和179.6s。3种射击工况下均是靠近模块盒右侧端面处的单基药最先着火,并形成环形烤燃响应区,单基药的烤燃响应温度分别为459.2、462.7和460.0K。

Thermal Safety Prediction of Modular Charge in the Chamber under Different Firing Conditions

To study the thermal safety of modular charge in the artillery chamber after continuous fire rounds,a 2D unsteady state cook-off model of modular charge in the chamber was established.The cook-off process of modular charge in the chamber was numerically simulated by FLUENT software,and the cook-off response characteristics of modular charge reloaded in the chamber after three continuous firing conditions was analyzed.The results show that firing conditions have much influence on the cook-off response time of modular charge,while it has little influence on the initial cook-off response position and cook-off response temperature.The cook-off response time of modular charge is 399.2s under the condition of firing 32 rounds at 5 rounds/min,while response times are 176.4s and 179.6s under conditions of firing 43 rounds at 1 round/min and firing 42 rounds at a mixed firing speed.The initial ignition position is near the right end of the cartridge,where the single-base propellant is ignited first and an annular firing response zone is formed for all three conditions.The ignition response temperatures of single-base propellant are 459.2,462.7and 460.0 K,respectively.