慢速烤燃环境下引信热响应特性测试与仿真

为揭示不敏感弹药用引信在烤燃试验下的热响应特性，掌握其内部热传递途径及规律，提出烤燃环境下隔爆式引信热响应分析方法。针对引信在受热刺激下的钝感化要求，以典型舰载76 mm口径弹头无线电引信为例进行烤燃试验测试与热有限元仿真，开展升温速率为1.17 ℃/min、终极温度为270 ℃慢速烤燃环境下的引信热响应特性研究。结果表明：基于热阻抗等效原则的“模块替换法”，即以具有相近导热系数的热电偶测温系统替代电池组件，实现了增加嵌入式测温系统不会过多影响引信原有的热量传递通道；设计了可嵌入引信内部的慢速烤燃测温微系统及Teflon材质防热保护壳体，通过试验证实了测温微系统在慢速烤燃环境下具有可靠性高、可同步测试等优势；对比引信内部各组件的温度差异证实了烤燃刺激下引信的热传递途径为压螺-安全和解除保险机构-导爆药-传爆药，明确了增加压螺以及安全和解除保险机构的热阻抗可降低导爆药和传爆药的意外发火概率。

Measurement and Simulation of Thermal Response Characteristics of Fuze in Slow Cook-off Test

A research method for the thermal response of detonating fuze in cook-off environment is proposed to reveal the thermal response characteristics of fuze for insensitive munition, and heat transfer path and law. The cook-off test and thermal finite element simulation are made for a radio fuze of projectile for 76 mm naval gun. In the cook-off test, the heating rate of 1.17 ℃/min and the ultimate temperature of 270 ℃ are given as thermal stimulus conditions in cook-off test, and a “module replacement” method based on the thermal impedance equivalence principle, i.e., replacing the “battery component” with “thermocouple measuring system”, is used. The original heat transfer path of fuze is not affected by adding an embedded temperature measuring system. Such embedded temperature measuring system with Teflon shell is capable of recording temperature data, and has the advantages of high reliability and multi-channel synchronous sensing. In addition, the heat transfer path,i.e., pressed screw-safe and arming device-lead explosive-booster explosive, of fuze in cook-off is confirmed by comparing the temperature differences among five components in the fuze. The increases in the thermal impedances of the pressed screw and the safe and arming device can greatly reduce the accidental ignition probabilities of lead explosive and booster explosive.