飞机燃油箱冷却惰化系统地面性能分析

Ground performance analysis of aircraft fuel tank cooling inerting system

设计了冷却惰化系统的工作流程并建立了地面状态下冷却惰化的数学模型,通过Modelica软件求解得到了油箱气相空间燃油蒸汽体积分数,燃油和气相空间温度以及制冷量随时间变化关系,并且研究了几个关键参数对惰化效果的影响。结果表明:随着抽气流量的增加和蒸发温度的降低,气相空间燃油蒸汽体积分数越低,气相空间温度也越低,达到冷却惰化的时间也越短,惰化效果也越好。虽然内热源对冷却惰化的效果起到了阻碍的作用,内热源越大,冷却惰化越难实现。但整体上看,冷却惰化是油箱惰化的一种可行替代方法。

The working process of cooling inerting system was designed and the mathematical model of cooling inerting under ground state was established.Moreover,the relationship between the volume concentration of fuel vapor,the temperature of fuel and gas phase space and the cooling capacity with time was solved by Modelica software.In addition,the influence of several key parameters on the inerting effect was studied.The results showed that with the increase of pumping flow and the decrease of evaporation temperature,the gas phase space fuel vapor volume concentration became lower,the gas phase space temperature declined,the cooling inerting time was shorter,and the inerting effect became better.With the enlargement of internal heat source,it’s more difficult to achieve cooling inerting.Although the internal heat source has a bad effect on cooling inerting,cooling inerting is a viable alternative to tank inerting.