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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 original Peng-Robinson state (VTPR) equation was modified by the specific volume shift method to improve the calculation accuracy of the liquid saturation of trifluoroiodomethane (CF_3I). Based on the VTPR equation and the classical van der Waals mixing rules, the N 2 mass of CF_3I filled with 1/2 and 2/3 fire extinguishers was calculated and compared with the experimental and literature values . The results show that the calculated values of different filling conditions are in good agreement with the experimental values and better than the results of PROFISSY software. The relationship between total pressure and temperature under different packing densities of 2.5 MPa and 4.2 MPa and CF 3 I were obtained respectively. The critical temperature and critical pressure of extinguishing agent filled with fire extinguisher were calculated. The pressure-temperature relation can be used to calculate Engineering Design of Airborne Fire Extinguishing System with CF_3I as Extinguishing Agent.