不同环境温度下的点火瞬态过程数值模拟  

Numerical Simulation of Transient Ignition Process Based on Different Ambient Temperature

作　　者：郑凌轩 余陵[1] 相翠玲 ZHENG Lingxuan;YU Ling;XIANG Cuiling(Nanjing University of Science and Technology School of Mechanical Engineering,Nanjing 210094,China)

机构地区：[1]南京理工大学机械工程学院,南京210094

出　　处：《兵器装备工程学报》2021年第6期96-100,共5页Journal of Ordnance Equipment Engineering

摘　　要：应用FLUENT流体计算软件,采用UDF功能以及侧壁加质的方法模拟某型号固体火箭发动机燃烧室加质在不同环境温度下的点火瞬态过程。研究了点火初期的升压曲线,点火压强峰值,堵盖打开时间以及装药末端内外压差变化。结果表明:环境温度越高,发动机头部和后段的压强峰值越高,并且堵盖打开时间越短,装药末端内外压差越大。此外,同燃速条件下,燃速系数和压强指数对点火过程几乎没有影响。In order to study the influence of different ambient temperature on the ignition transient process for a certain SRM,thepresent study was based on FLUENT software and used UDF interface programme,in which the additional mass of combustion chamber was simulated with profile adding mass.The pressure rise curve at the initial stage of ignition,the peak ignition pressure,the opening time of the cover,and the change of the internal and external pressure difference at the end of grain were studied.The results show that the higher the ambient temperature is,the higher the peak pressure of the engine head and the rear section are,and the shorter the opening time of the cover is,as well as the greater the pressure difference between the inside and outside of the charge end.In addition,under the same burning rate conditions,the burning rate coefficient and pressure index have almost no effect on the ignition process.

关 键 词：固体火箭发动机 数值模拟 环境温度 压强峰值 压差 

分 类 号：TJ71[兵器科学与技术—武器系统与运用工程]