论文部分内容阅读
在不同富氮气体入口参数下,对某大型运输机中央翼燃油箱的惰化过程进行了数值模拟,研究了在不同流量和体积分数富氮气体条件下燃油箱的惰化规律.计算结果显示:当富氮气体中氮气体积分数为95%、体积流量分别为0.021,0.028m3/s和0.042m3/s时,燃油箱内平均氧体积分数随体积置换次数的变化曲线几乎完全重合;当富氮气体体积流量为0.042m3/s、氮气体积百分比分别为92%,94%和98%时,燃油箱惰化率随时间的变化曲线重合.说明相同体积分数富氮气体条件下燃油箱惰化完成时所需富氮气体量与富氮气体流量无关,而富氮气体的流量直接决定了各舱室富氮气体的惰化率.通过对计算结果的分析,证明了利用缩比油箱去模拟真实油箱的惰化过程的合理性.为优化某运输机中央翼燃油箱惰化系统设计提供参考.
The inerting process of the center wing fuel tank of a large transporter was numerically simulated under different nitrogen rich gas inlet parameters and the inerting law of the fuel tank under different nitrogen and nitrogen rich gas volumes was studied.The calculation results show that: When the volume fraction of nitrogen in the nitrogen-rich gas is 95% and the volume flow rates are 0.021, 0.028 m3 / s and 0.042 m3 / s, the curves of the average oxygen volume fraction in the fuel tank almost completely coincide with the volumetric displacement times. When the gas volume flow rate is 0.042m3 / s and the nitrogen gas volume percentage is 92%, 94% and 98% respectively, the inertia of the fuel tank coincides with the curve of time, indicating that the fuel tank is inerted under the same volume fraction of nitrogen rich gas The amount of nitrogen-rich gas required is not related to the flow rate of nitrogen-rich gas, and the flow rate of nitrogen-rich gas directly determines the inerting rate of nitrogen-rich gas in each chamber.By analyzing the calculation results, it is proved that the use of reduced- The rationality of the inerting process in order to optimize the design of the center wing fuel tank inerting system for a transport aircraft to provide a reference.