桥丝式电点火头发火能量的输出形式

采用高速摄像与激光纹影技术研究桥丝式点火头在电容放电作用下的能量输出形式,并观测点火头点燃延期体的动态过程。结果表明,电容放电作用后,桥丝形成气化热能,周围介质受热形成高温热流,桥丝断开后的高压放电和药剂爆燃共同作用形成弱冲击波,每种能量形式在无限空间内各向同性,各能量形式间速度不同;点火头点燃延期体过程中,先行弱冲击波的反射使高温流场在某一平衡位置振荡,延迟移向被点火面,炽热燃烧物受弱冲击波反射的影响小。

Firing Energy Output Forms of the Bridgewire Fusehead

Firing energy output forms of the bridgewire fusehead under capacitor discharge were researched, by the high speed camera and laser schlieren technique, and the process of the fusehead igniting the delay elements was also observed. The results show that under capacitor discharge, heating energy formed by the gasification of bridgewire, high temperature heat flow generated by surrounding mediums heated, and weak shock wave formed by the electrion of bridgewire breaking suddenly and the deflagration of thin layer powders. Any types of the firing energy output forms is of isotrop in the infinite space and the spreading rates of which are different. In the finite space, reflection of the leading weak shock wave makes the high temperature heat flow undulate in a balanced position, and postpones moving toward the ignited surface, and yet has few effects on the molten comburent.