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氮气为直升机灭火瓶内灭火剂的快速释放提供驱动力,确定氮气充填量和气相空间氮气的摩尔比例,是直升机动力舱灭火系统设计中的关键问题之一。基于PengRobinson(PR)状态方程和Wong-Sandler(WS)混合规则,提出了一种灭火瓶氮气充填量预测方法,针对Halon301和HFC-227ea的不同充装工况,通过3层迭代计算确定氮气充填量,与试验和文献结果进行了对比,并分析了灭火瓶内压强和氮气摩尔比例随温度的变化情况。结果表明:对Halon1301充填1/2灭火瓶的试验工况,氮气充填量计算值的平均误差约为4.7%;对充填2/3试验工况,平均误差约为1.1%,计算结果优于PROFISSY和HFLOW软件计算结果。对HFC-227ea充填1/2灭火瓶和2/3灭火瓶工况的平均误差分别为4.3%和2.3%,与PROFISSY软件的计算精度相当。该方法可以用于机载灭火系统工程设计。
Nitrogen provides a driving force for the rapid release of fire extinguishing agent in helicopter fire extinguishing bottles. Determining the nitrogen filling amount and the molar ratio of nitrogen in the gas phase space is one of the key issues in the design of the fire extinguishing system of a helicopter power cabin. Based on the PengRobinson (PR) equation of state and the Wong-Sandler (WS) mixing rule, a method for predicting the filling quantity of nitrogen in fire extinguishers was proposed. According to the different filling conditions of Halon 301 and HFC-227ea, The results were compared with the experimental and literature results. The changes of the pressure and nitrogen molar ratio in the fire extinguishing flask with temperature were analyzed. The results show that the average error of calculated values of nitrogen filling volume is about 4.7% for experimental conditions of Halon1301 filled with 1/2 fire extinguishers, and the average error is about 1.1% for filling 2/3 experimental conditions. The calculated results are better than that of PROFISSY And HFLOW software calculations. The average error for HFC-227ea filled 1/2 and 2/3 flasks was 4.3% and 2.3%, respectively, commensurate with the calculated accuracy of PROFISSY software. The method can be used in airborne fire extinguishing system engineering design.