摘要
针对影响聚乙烯(PE)在固体燃料冲压发动机燃烧室中的燃速因素,采用数值仿真与直连式实验相结合的方法,研究了空气质量通量和固体燃料内径对PE燃料平均燃速和当地燃速的影响,分析了无量纲回流区长度与突扩台阶高度的关系。研究表明,PE燃料平均燃速与空气质量通量呈幂函数递增关系,与固体燃料内径呈幂函数递减关系;点火过程的影响以及湍流燃烧模型对突扩台阶后回流区内传热的计算精度是引起回流区内计算结果与实验结果误差较大的重要原因;无量纲回流区长度与突扩台阶高度呈线性递增函数关系。研究结果对固体燃料冲压发动机燃烧室的设计具有一定的参考价值。
Numerical simulation and direct test methods are used to research the influence of selected factors on the burning rate of polyethylene in a solid fuel ramjet. The influences of air mass flux and fuel internal diameter on average burning rate and local average burning rate are studied. The relationship between reattachment length ratio and step height ratio is analyzed. The results show that the average burning rate of the fuel is increased by power function with the increase in air mass flux,and decreased by power function with fuel internal diameter. The difference between simulation and experimental results is caused by the ignition process and the computational accuracy of turbulent combustion model to predict the heat transfer behind a sudden expansion step. The reattachment length ratio increased by liner function with step height ratio.
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2014年第11期1783-1789,共7页
Acta Armamentarii
基金
总装备部预先研究项目(404040301)
