含电磁敏感铁丝推进剂的制备及其燃烧性能研究

In response to the difficulty of achieving intelligent combustion control and unclear understanding of the mechanism for solid propellants, an electromagnetic sensitive propellant was prepared by embedding iron wire into a ding hydroxyl system. The combustion characteristic data was obtained. The combustion control mechanism was revealed. Firstly, iron wire was selected as electromagnetic sensitive material due to its fast-heating rate under electromagnetic excitation. The energy of propellant embedded with iron wire was simulated using chemical equilibrium with applications. Then, the combustion and mechanical performance experiments were conducted by using a visual combustion experimental platform and a material testing machine, separately. Finally, the burning rate control mechanism of the propellant containing iron wire under electromagnetic excitation was elucidated. Results showed that as the diameter of the embedded iron wire increased, the solid content of propellant increased, the theoretical specific impulse decreased, the density increased, and the burning rate first increased and then decreased. The maximum tensile strength of the propellant embedded with a 0. 4 mm diameter iron wire was 0. 714 MPa. The burning rate under electromagnetic excitation was 6. 10 mm/s, which is 2. 65 times higher than that of same propellant without electromagnetic excitation, and 5. 26 times higher than that of the propellant without the embedded iron wire. Under electromagnetic excitation, the propellant containing iron wire was subjected to the combined effects of high-temperature combustion gas, heat release from combustion between Al and oxide with iron, and electromagnetic field, resulting in a faster temperature rise and a higher temperature in the preheating zone of unburned propellant, leading to a faster increase in burning rate. This study provides experimental support and theoretical basis for the design and combustion control of electromagnetic sensitive propellants.