快速烤燃引信安全性分析与等效试验方法

The thermal protection technology and equivalent testing technology are the key to improving the safety of fuzes during fast cook-off and the iterative efficiency of multiple rounds of optimization design of thermal protection. According to the one-dimensional fuze heat conduction model, the theoretical equations for the radial temperature distributions of explosive and fuze shell are constructed. An aluminum-silicon aerogel thermal protection model is established for aerial bomb fuze. The simulation study on the fast cook-off of fuze is carried out to obtain the temperature change curve of the explosive inside the fuze undergoing a 20-minute heating environment at 800 ℃ . The critical thickness of thermal protection material is 3 mm,and the final temperature of explosive is 87. 8 ℃ lower than its 5 s explosion temperature (280 ℃), which can ensure the thermal safety of fuze. Taking the fuze coated with aluminum-silicon aerogel as the verification subject,an equivalent test method for the fast cook-off of fuze is established based on simulation analysis and high-temperature flame injection test platformm,which is combined with the standard fast cook-off test method. Test results show that when comparing the temperature measurement data of fuze vulnerable points in standard tests with simulation data, the accuracy of the standard test results exceeds 91%. When comparing the measured temperature of fuze vulnerable points in equivalent tests with the measurement results of standard tests,the accuracy of the equivalent test results exceeds 95%.