低压环境下固液混合燃料爆炸特性研究

In order to study the combustion and explosion characteristics and reaction mechanism of solid⁃liquid mixed fuels under low pressure environment in plateau, two kinds of solid⁃liquid mixed fuels, aluminum powder⁃ether and aluminum powder⁃ether⁃nitromethane, were taken as the research objects by using 20 L explosion ball test system. The influence of initial pressure on explosion peak pressure, lower explosion mass concentration limit and explosion products was studied. The results show that the optimal explosion mass concentration, explosion pressure and explosion risk of the two solid⁃liquid mixed fuels decrease with the decrease of environmental pressure. Compared with the altitude of 0 m, at the simulated altitude of 4 500 m (57. 4 kPa), the explosion pressure of 450 g / m³ solid⁃liquid mixed fuel decreased by 26. 84% - 30. 80%, and the lower explosion mass concentration limit increased by 5 - 10 g / m³. As the ambient pressure decreases, the volume fraction of CO increases, while the volume fractions of CO₂, NO and NO₂ decrease. The explosive solid residues are mainly α-Al₂O₃ and Al.