Study on the Cook-off Characteristics of B/KNO3 Ignition Charge
The cook-off test devices for multi-point temperature measuring are established to study the thermal safety of B/KNO3 ignition charge.The multi-point temperature measuring and cook-off tests of B/KNO3 ignition charge under the conditions of different heating rates and charge densities are made to obtain the accurate ignition time of ignition charge and the temperature curves of different monitoring points during the cook-off tests.A numerical calculation model of B/KNO3 ignition charge for the cook-off test is established.The self-thermal decomposition reaction and phase transition heat absorption of ignition charge are considered in the calculation model.Then,the model is used to simulate the cook-off process of B/KNO3 ignition charge under the conditions of different heating rates and charge densities.The thermal and kinetic parameters of B/KNO3 ignition charge are calibrated by comparing with the experimental results.The results show that the pre-exponential factor of B/KNO3 ignition charge is 7.763 × 1013 s-1,and its activation energy is 2.078 7 × 105 J/mol;with the decrease in the heating rate,the ignition delay time increases gradually,the ignition area moves to the center gradually,and the ignition ambient temperature decreases gradually.When the change in charge density is not significant,the ignition characteristics of ignition charge do not differ much.
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