Abstract:
In order to study the firing time of the metal bridge model and the bridge-wire ignition head under different ignition voltages and clarify the specific influence of the initial energy input to the ignition head on its ignition process, this paper uses a high-speed schlieren testing system to capture the ignition process of the ignition head. The reasons for the shortened time of the thermal decomposition stage, flame growth period, and flame duration of the ignition head under different ignition voltages are analyzed. The variation curves of the total ignition time of the two types of ignition head with voltage and the fitting curves of the total ignition time and energy are obtained, revealing the corresponding relationship between the energy required for ignition head ignition and the remaining energy of the capacitor. The results show that within the range of 13-21 V, the rate of change of the total ignition time of the ignition head with voltage first decreases and then increases. As the ignition voltage increases, the time reduction rates of the thermal decomposition stage, flame growth period, and flame duration of the metal bridge model ignition head are 66.2%, 76.6%, and 15%, respectively. The time reduction rates of the three stages of the bridge wire ignition head are 28%, 39.2%, and 30%, respectively. Moreover, the ignition time of each stage of the metal bridge model ignition head is shorter than that of the bridge wire ignition head. When 1.9 mJ < E < 4.9 mJ, the ignition consistency and ignition accuracy of the metal bridge model and bridge wire ignition heads will be affected. When E < 1.9 mJ, the ignition head fails to ignite due to insufficient ignition energy.
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