膏体推进剂变截面管道流动的数值仿真  

Numerical Simulation of the Non-uniform Cross-section Pipe Flow of Pasty Propellant

作　　者：周超[1] 周守强[1] 张家仙[1] 

机构地区：[1]南京理工大学机械学院,江苏南京210094

出　　处：《计算机仿真》2008年第10期62-64,共3页Computer Simulation

摘　　要：应用Ostwald幂律本构关系,分析了膏体推进剂在收缩管道内的稳态流动特性,获得了管内的流速、压力的分布。以收缩角θ(半锥角)为对象,研究了收缩角对流场的影响,得到了单位长度管道压力差与收缩角的关系。根据仿真结果发现,收缩角对压力分布影响较大,在管道渐变处,收缩角越大,压力分布越复杂。而收缩角对流场速度分布影响不大。收缩角对输送能量损耗影响很小,在设计膏体推进剂输送功率时可以忽略这一参数,将收缩过渡段当成细管道计算,处理是安全的。为了避免膏体推进剂流动时产生"死区",应该采用小收缩角管道。Applying Ostwald power constitutive model, the steady flowing property of the pasty propellant in con- traction conduit was analyzed, and the distributions of velocity and pressure were obtained. Seeing contraction angle as a variable, the flow fields with different contraction angle were investigated. The simulation results indicate that contraction angle has distinct effect on pressure distribution. At the contraction area of pipe, the bigger contraction angle, the more complex pressure distribution. Contraction angle has little effect on velocity distribution. Energy loss is not sensitive to contraction angle. Seeing contraction area as thin pipe and neglecting the contraction effect is safe. In order to avoid the dead zone of flow field, smaller contraction angle should be designed.

关 键 词：膏体推进剂 收缩流动 数值仿真 

分 类 号：V211.79[航空宇航科学与技术—航空宇航推进理论与工程]