驻涡火焰稳定器式粉末燃料冲压发动机两相流数值模拟

摘要

根据已有粉末燃料冲压发动机的特点,设计了驻涡火焰稳定器,并对现有发动机结构进行了改进,提出了驻涡火焰稳定器式粉末燃料冲压发动机.采用颗粒轨道模型,对镁基粉末燃料冲压发动机进行了三维流场数值模拟,对比分析了改进前后发动机内流场结构对该发动机燃烧效率的影响,以便为进一步的实验研究提供指导.数值模拟结果表明,驻涡火焰稳定器的应用,可使燃烧效率较现有发动机提高10％.%A trapped vortex flame holder was designed for the powdered fuel ramjet, and the configration of trapped vortex flame holder-based powdered fuel ramjet was put forward. The 3D two-phase flow field in the magnesium powdered fuel ramjet was numerically simmulated by the particle trajectory model. The effects of the ramjet internal flow field on the combustion efficiency was cont-rastively analyzed between the two configrations, so as to provide references for the further experimental investigation. The results show that the ramjet combustion efficiency is improved by 10% with the application of trapped vortex flame holder.