| Citation: | WANG Liqun, LI Yufang, LIU Guannan, et al. RP-3 fuel minimum ignition energy measuring system and spark discharge characteristics[J]. Journal of Aerospace Power, 2026, 41(1):20240689 doi: 10.13224/j.cnki.jasp.20240689 |
A small energy spark discharge system based on an RLC discharge circuit was designed for measuring the minimum ignition energy of domestic aviation fuel RP-3. The relationship between spark discharge and charging voltage, as well as capacitor capacity, was studied considering capacitor residual energy and circuit energy loss. The spark discharge current, energy consumption, and efficiency at different energy levels were analyzed, and minimum ignition energy tests for RP-3 fuel were conducted. The results showed that the RLC circuit is suitable for spark discharge systems below 1 J. The larger capacitor meant the greater stored energy, the longer discharge time, and the higher spark discharge efficiency, reaching up to 80%. The minimum ignition energy of fuel vapor varied with temperature, following a “U” shape curve. At 50 ℃ and 101 kPa, the minimum ignition energy was 0.167 mJ.
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