摘要
为研究灼热桥丝式电火工品的脉冲激励安全性,建立了灼热桥丝式电火工品的温升数理模型,研究了灼热桥丝式电火工品的发火判据,设计了灼热桥丝式电火工品临界发火电流的计算流程,揭示了单脉冲和脉冲串电流的激励参数对灼热桥丝式电火工品临界发火电流的影响规律。结果表明,在单脉冲激励下,当脉冲宽度小于5μs时,灼热桥丝式电火工品的临界发火能量固定,即桥药系统处于绝热状态,灼热桥丝式电火工品是否发火与桥丝输入的能量有关;而当脉冲宽度大于15 ms时,灼热桥丝式电火工品临界发火电流固定,其发火状态与桥丝的电功率有关。在窄脉冲串电流激励下,临界发火电流随重复周期变化曲线的时间常数与脉宽无关,且当重复周期大于1.25 ms时,桥药系统无热累积效应,其临界发火电流与单脉冲电流作用情况一致;而当重复周期小于1.25 ms时,桥药系统出现热累积效应,该效应导致临界发火电流随重复周期降低而迅速衰减。
To study the safety of pulse excitation of hot bridge wire EED,we established a numerical model for the temperature rise of the hot bridge wire EED,and the ignition criterion of hot bridge wire EED was obtained.Based on the above,we designed the calculation procedure for the critical ignition current of the hot bridge wire EED and revealed the influence of single pulse and pulse train current excitation parameters on the critical ignition current of hot bridge wire EED.The results showed that under single pulse excitation and when the pulse width was less than 5μs,the ignition energy of the hot bridge wire EED was fixed,which suggested that the bridge wire‑reagent system was in an adiabatic state.So the ignition state was related to the energy input to the bridge wire.However,when the pulse width was greater than 15 ms,the critical ignition current of the hot bridge wire EED was fixed.So the ignition state was related to the electric power of the bridge wire.Another difference was that under narrow pulse train current excitation,the time constant of the curve for critical ignition current with repetition period was independent of the pulse width.Furthermore,when the repetition period was greater than 1.25 ms,the bridge wire‑reagent system exhibited no thermal accumulation effect,and the critical ignition current was the same as the single pulse current excitation.However,when the repetition period was lower than 1.25 ms,the bridge wire‑reagent system exhibited the thermal accumulation effect,which resulted in rapid decrease of the critical ignition current as the repetition period decreased.
作者
吕旭旭
魏光辉
杜雪
卢新福
孙江宁
LYU Xu-xu;WEI Guang-hui;DU Xue;LU Xin-fu;SUN Jiang-ning(National Key Laboratory of Electromagnetic Environment Effects,Army Engineering University of PLA Shijiazhuang Campus,Shijiazhuang 050003,China)
出处
《含能材料》
EI
CAS
CSCD
北大核心
2023年第6期589-597,共9页
Chinese Journal of Energetic Materials
关键词
灼热桥丝
电火工品
数理模型
脉冲激励
热累积效应
hot bridge wire
electro explosive device
numerical model
pulse excitation
thermal accumulation effect
