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文章以气体发生器装药燃烧模型和多孔介质理论为基础,针对两种不同燃烧性能的产气药进行仿真计算,分析降温剂孔隙率和排气孔大小对燃烧室压强的影响。结果表明排气孔直径对燃烧室压强具有临界值。当直径大于临界值时,燃烧室压强几乎不受排气孔直径影响,此时,降温剂孔隙率大小对燃烧室压强影响更大;当排气孔直径小于临界值时,燃烧室压强受排气孔直径影响更大。文章研究的计算模型可推广至所有气体发生器的仿真计算,实现结构和降温剂的优化设计。
Based on the combustion model of gas generator and the theory of porous media, this paper simulates the gas-generating drugs with two different combustion performances and analyzes the influence of the porosity and the size of the vent on the pressure in the combustion chamber. The results show that the vent diameter has a critical value for the combustion chamber pressure. When the diameter is greater than the critical value, the pressure in the combustion chamber is almost unaffected by the diameter of the vent. In this case, the porosity of the cooling agent has a greater effect on the pressure in the combustion chamber. When the diameter of the vent is smaller than the critical value, Stomatal diameter has a greater impact. The calculation model of the article can be generalized to the simulation calculation of all gas generators to realize the optimal design of the structure and cooling agent.