摘要
针对 Φ31 5 mm实验发动机和某发动机工作状态及结构特点 ,进行了发动机燃烧室内三维两相流动数值模拟和内绝热层的炭化冲蚀规律研究。计算中应用了颗粒轨道模型和二阶迎风有限体积方法 ,对纵、横加速度载荷下的两相流动进行了模拟 ,分析了纵、横向载荷对两种发动机燃烧室内粒子场和聚集带的影响 ;应用绝热层炭化冲蚀和两相流粒子热增量模型 ,分析了实验发动机在多种纵、横向过载作用下的绝热层冲蚀规律。在与 Φ31 5 mm实验发动机结果对照后 ,修正了炭化冲蚀计算所需参数 ,进一步预示了发动机的三维两相流场和炭化冲蚀率 ,并在 35 gn 过载下分析了推进剂含铝量对粒子聚集密度和炭化冲蚀的影响。
Aiming at operation condition and configuration characteristic of a test motor and full scale SRM, numerical simulation on 3 D two phase flow was conducted, and erosion mechanism of internal insulation investigated. Particle trajectory model and two order upwind finite volume method were used to simulate two phase flow under longitudinal and transverse acceleration, and the effect of these accelerations on particle trajectory and agglomeration zone analyzed. Charring erosion of insulator and two phase particle heatflux increment model was applied to analyze erosion rate of insulator under various longitudinal and transverse acceleration. Based on the experimental results of test motor Φ315mm, the parameters used in the erosion calculation were modified to predict the 3 D two phase flow field and charring erosion rate. The effect of aluminium percentage on particle agglomeration density and erosion rate was analyzed under 35 g n acceleration. The calculation results provide some theoretical dependencies to failure analysis of full scale motor and testing results assessment.
出处
《固体火箭技术》
EI
CAS
CSCD
北大核心
2001年第4期4-8,共5页
Journal of Solid Rocket Technology
