摘要
采用微元段计算方法,建立了燃油洗涤过程的数学模型,考虑到洗涤过程中的富氮气体不能和燃油中的溶解气进行充分的传质,故定义了洗涤效率.计算结果与文献公布的实验数据对比表明:引入洗涤效率后,计算值与实验值一致性更高.研究结果显示,在同样的富氮气体流量,且气相空间惰化效果一致的情况下,洗涤效率直接影响洗涤时间和燃油及气相空间中氧的体积分数.较低的洗涤效率虽然可使洗涤时间缩短,但是容易造成爬升至巡航高度后,油箱上部空间氧的体积分数增加幅度较大,且该影响随着载油量增加而加大,故应根据载油量、洗涤时间、洗涤气流量等综合考虑合适的洗涤效率.研究结果可为机载制氮系统的设计提供理论基础.
The mass transfer between nitrogen-enriched air（NEA） and dissolved gas in the fuel could not be fully conducted,so the scrubbing efficiency was defined to set up the mathematical model of the scrubbing process based on infinitesimal method.The comparison between calculated results and experimental data revealed that,the introduction of the scrubbing efficiency could increase the simulated precision.The study results indicate that,the scrubbing efficiency has direct impacts on the total scrubbing time,the oxygen concentration in fuel and on ullage under the same NEA flow rate and inerting effect.The lower scrubbing efficiency could save the total scrubbing time,but the higher oxygen concentration on ullage occurs when the aircraft reaches a cruising altitude,and the influence is positively related to the fuel loads.Therefore,a proper scrubbing efficiency should be determined and considered from the fuel load,scrubbing time and NEA flow rate.The present study lays a preliminary theoretical foundation for the design of on-board inert gas generator system.
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
2010年第11期2457-2463,共7页
Journal of Aerospace Power
基金
航空科学基金(2007ZC52038)
611航空科研基金
关键词
机载惰化系统
油箱惰性化
洗涤效率
数学模拟
防火防爆
on-boarding inert gas generator system； fuel tank inerting； scrubbing efficiency； numerical simulation； fire and explosion protechtion；
