Nanjing Vocational University of Industry Technology, School of Mechanical Engineering, Yangshan North Road Street, 1, 210023 Nanjing, China.
Nanjing Institute of Technology, School of Energy and Power Engineering, Chunhua Street, n/n, 211167 Nanjing, China.
An Acad Bras Cienc. 2023 Oct 30;95(3):e20220762. doi: 10.1590/0001-3765202320220762. eCollection 2023.
With the higher requirements of various tactical and technical indicators of the weapon systems, the current research on the ignition and combustion characteristics of different types of solid propellants is not comprehensive. In more complex and harsh environmental conditions, the pressure affects the ignition and combustion characteristics. Therefore, the paper studies the ignition and combustion characteristics of the modified double-base propellants (MDB propellants) and fuel-rich propellants (FR propellants) under low-pressure environment. Combining experiment and theory, the ignition delay time and burning rate of two kinds of solid propellants are compared and analyzed at low pressure by the laser ignition experimental device. The results displayed that the burning flames of the FR and MDB propellant presented evident V-shape and cylindrical, respectively. The flame brightness decreased with the decrease in pressure. With the increase of pressure and heat flux, the ignition delay time of the MDB propellant and the FR propellant decreased. By comparison, Model 2 of the ignition delay time was more effective for the estimation of the ignition delay time of the FR propellant. The experimental results are compared with the three burning rate models, which are the Vielle formula (Model 1), Summerfield formula (Model 2), and B-number burning rate formula (Model 3). The results showed the burning rate was more in accord with Model 3.
随着武器系统各种战术技术指标要求的提高，目前对不同类型的固体推进剂点火燃烧特性的研究还不够全面。在更加复杂和恶劣的环境条件下，压力会影响点火和燃烧特性。因此，本文研究了改性双基推进剂（MDB 推进剂）和富燃料推进剂（FR 推进剂）在低压环境下的点火和燃烧特性。本文结合实验和理论，利用激光点火实验装置，对两种固体推进剂在低压下的点火延迟时间和燃烧速率进行了对比分析。结果表明，FR 和 MDB 推进剂的燃烧火焰分别呈现明显的 V 形和圆柱形。火焰亮度随压力的降低而降低。随着压力和热流的增加，MDB 推进剂和 FR 推进剂的点火延迟时间减小。相比之下，点火延迟时间模型 2 更能有效地估计 FR 推进剂的点火延迟时间。将实验结果与三种燃烧速率模型进行比较，即 Vielle 公式（模型 1）、Summerfield 公式（模型 2）和 B 数燃烧速率公式（模型 3）。结果表明，燃烧速率与模型 3 更吻合。
