基于VTPR方程计算N_2/CF_3I充填特性  

Calculating filling properties for N_2/CF_3I based on volume translation Peng-Robinson equation

作　　者：陈梦东[1] 余建祖[1] 谢永奇[1] CHEN Mengdong YU Jianzu XlE Yongqi(School of Aeronautic Science and Engineering, Beihang University, Beijing 100083, China)

机构地区：[1]北京航空航天大学航空科学与工程学院,北京100083

出　　处：《航空学报》2016年第12期3706-3712,共7页Acta Aeronautica et Astronautica Sinica

摘　　要：采用比容平移法修正原始的Peng-Robinson状态(VTPR)方程,提高三氟碘甲烷(CF_3I)液相饱和区密度的计算精度。基于VTPR方程,结合经典的范德瓦尔混合规则,计算了N_2作为增压介质时,CF_3I充填1/2灭火瓶和2/3灭火瓶所需的N_2质量,并与试验值和文献值进行对比。结果表明,不同充填工况的计算值与试验值基本吻合,并且优于PROFISSY软件的结果。获得了充填压力分别为2.5 MPa和4.2 MPa、CF_3I不同充填密度下的总压力与温度的关系式,并计算了灭火剂热膨胀充满灭火瓶的临界温度和临界压力,该压力-温度关系式可用于以CF_3I为灭火剂的机载灭火系统工程设计。The volume translation method is used to correct the original Peng-Robinson state（VTPR）equation for representing the density of trifluoroiodomethane（CF_3I）in the saturated region.Based on VTPR equation associated with the classical van der Waals mixing rule,the mass of N_2 required to pressurize CF_3 I is calculated.For the case of filling one-half and two thirds of extinguisher,the results show that calculated mass of N_2 agrees well with the experimental data and it is better than the values of PROFISSY software.With different filling density of CF_3 I,the relationship of total pressure versus temperature is obtained when the super-pressurized pressure are 2.5MPa and 4.2MPa.Besides,the critical pressure and critical temperature are also acquired when the fire agent bottle is liquid-full.The relationship of pressure versus temperature for the agent of CF_3 I will help to design fire suppression system in aircraft.

关 键 词：灭火瓶 VTPR方程 三氟碘甲烷(CF3I) 气液平衡 充填特性 

分 类 号：V228.6[航空宇航科学与技术—飞行器设计]