The study demonstrates the effects of exploding foil variations on ignition energy for B/KNO3 in EFDIs, indicating critical design implications.
To ensure the reliability of the Exploding Foil Deflagration Igniter (EFDI) and at the same time reduce its ignition energy, the standard B/KNO 3 composition was used as the ignition charge for the EFDI. The effects of variations in exploding foil bridge dimensions and flyer thickness on the ignition energy of the B/KNO 3 composition were investigated within the Slapper-BPN charge structure. The results show that both the bridge size and flyer thickness are critical factors influencing the ignition energy of B/KNO 3 composition. Within specific ranges, increasing the bridge size, the minimum ignition voltage of the EFDI first decreases then increases and increasing the flyer thickness reduces the minimum ignition voltage of the EFDI. Under the conditions of a 0.4 μF charging capacitor, a B/KNO 3 compaction density of 1.50 g.cm —3 , a bridge size of 0.35 mm × 0.35 mm, and a flyer thickness of 75 μm, the minimum ignition voltage of the EFDI was reduced to 1100 V. The feasibility of the standard B/KNO 3 composition for direct application to the engineering design of Slapper-BPN EFDI was verified.
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Lei et al. (2025) studied this question.
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