多隔舱燃油箱惰化流场的数值模拟与分析

根据多隔舱燃油箱的特点,建立了适用于多隔舱燃油箱惰化流场的数值模拟方法.将数值模拟结果与工程模型结果及国外文献中的实验数据进行了对比,验证了该方法的正确性.通过对各个隔舱内氧气体积分数分布的分析发现,惰化过程中,各个隔舱内的氧气体积分数趋于均匀,流出某隔舱的气体的氧气体积分数近似等于该隔舱内的平均氧气体积分数.将数值模拟得到的两种流通方式下隔舱间气体体积流量分配情况与隔舱间流通面积比进行对比发现,当通气口相对于富氮气体进口对称布置时隔舱间体积流量能够近似按照面积比分配,而不对称布置时分配情况比较复杂,不能够简单地按照面积比确定.

Numerical simulation and analysis of nitrogen-enriched air flow in multi-bay fuel tank

According to the characteristic of multi-bay fuel tank,a numerical simulation method for nitrogen-enriched air (NEA) flow in multi-bay fuel tank was developed.Firstly,the correctness of this method was verified by comparing the inerting results from numerical simulation with the results of the engineering model and the test data from foreign literatures.Secondly,after analyzing the oxygen volume fraction in individual bay of the inerting process,it was found that the oxygen volume fraction distribution in individual bay tended to be even and the outflow oxygen volume fraction of one bay was approximately equal to the average oxygen volume fraction of that bay.Lastly,the simulated flow rates were compared with the cross-section flow areas between different bays.It is found that if the vents are placed symmetrically to the inlet of NEA,the flow rates can be weighted based on the cross-section flow areas; while if the vents are placed asymmetrically to the inlet of NEA,the flow pattern would be relatively complex.