关键词: 火炮, 模块装药, 热安全性, 射击环境温度, 烤燃响应特性

Abstract: To analyze the thermal safety of modular charge retaining in the chamber after continuous firing of gun until the temperature in inner chamber reaches the possible temperature value of cook-off response, a 2D unsteady state cook-off model of the modular charge is established. Cook-off process of the combustible module filled with single-base propellant is simulated by Fluent. Cook-off characteristics of modular charge during retaining in the chamber after a number of rounds were fired at 1 round/min under different ambient temperatures of 50 ℃,20 ℃,0 ℃,-20 ℃ and -40 ℃ were analyzed numerically. Results show that the lower the ambient temperature during firing is, the longer the cook-off response time of modular charge is. The cook-off response times are 136.0 s,176.4 s,205.7 s,237.4 s and 278.5 s, respectively, under five ambient temperatures. The initial ignition position is near the right end inner surface of module box, where the single-base propellant ignites first and forms an annular firing response zone under all ambient temperatures. The ignition response temperatures of single-base propellant are 454.2-462.6 K under different firing conditions. Key

Key words: gun, modularcharge, thermalsafety, ambienttemperature, cook-offresponsecharacteristic