摘要
利用PDF模型和颗粒轨道模型,对燃气侧喷冲压发动机补燃室两相流流场进行三维数值模拟,其中铝颗粒的燃烧模型采用蒸发扩散模型.考虑颗粒直径、空燃比和颗粒含量的影响,得出了产物组分、温度等发动机参数的变化趋势.结果表明,由于燃气侧喷发动机结构特殊,具有两处扩散火焰峰面,随着液滴颗粒直径的增大,燃烧效率降低,出口温度下降;空燃比越大,燃烧效率越低;随着颗粒含量的增加,颗粒燃烧绝对质量增加,燃烧效率降低.
The two-phase flow field in secondary combustion chamber for gas dual-injection ramjet was numerically simulated by using PDF model and particle trajectory model. Aluminum particle combustion was controlled by diffusion-vaporization model. The effects of particles diameter, airfuel ratio and particles content were considered. The trend of resultant species and temperature with above conditions were obtained. The results indicate that the gas combustion in gas dual-injection ramjet has two diffusion flame peak. The combustion efficiency of aluminum particles and the temperature of outlet both reduce with increase of aluminum particle diameter. The combustion efficiency of aluminum particle decreases with increase of the air-fuel ratio. With increase of the aluminum particle content, absolute mass of aluminum particles combusted raises, but the combustion efficiency of aluminum particle decreases.
出处
《弹道学报》
CSCD
北大核心
2008年第3期9-12,共4页
Journal of Ballistics
关键词
冲压发动机
补燃室
数值模拟
两相流
ramjet engine
secondary combustion chamber
numerical simulation
two-phase flow
