【摘要】 为了得到某硼/硝酸钾热桥丝火工品电热响应特性,利用有限元方法模拟了电流输入下火工品桥丝及周围药剂的温度场。计算了不同输入电流下火工品的电热响应,分析了桥丝直径、药剂区域尺寸、环境温度及热对流换热系数对电热响应的影响;结果表明:当输入电流较大时,桥丝-药剂界面温度将持续升高,并很快达到药剂爆发点;在通入电流至发火前,仅桥丝周围极小区域内药剂温度显著升高;桥丝直径对电热响应影响显著;装药量、环境温度及热对流换热系数对桥丝-药剂界面的温升特性无显著影响。更多还原

【Abstract】 In order to acquire the electric-thermal response of the hot bridge-wire electro-explosive device with B/KNO₃ ignition powder,the FE method was used to simulate the heat transfer process by current excitation. The thermal response of the bridge-wire and surrounding powder was calculated under conditions of different current,and the influence of the bridge-wire diameter,ignition powder amount and environment factors on the temperature field was analyzed. Results show that in the case of large current excitation the interference temperature of the powder and bridge-wire can keep rising until the ignition point and only the minimum range of the powder around the bridge-wire are heated remarkably. Moreover the diameter of the bridge-wire has an obvious influence on the electric-thermal response while the ignition powder amount and natural environment has little effect on the temperature field of the bridge-wire and surrounding ignition powder.更多还原