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在假设燃油箱整体和各隔仓无质量堆积的前提下,建立了一种可根据压力差自动确定流动方向和流量的数学模型,并给出了迭代法计算的步骤,然后采用微元法获得了惰化过程中各隔仓体积氧浓度随换气次数的关系.以波音747中央翼油箱为对象,与国外文献中公布的实验数据进行了对比,验证了所建模型有较高的计算精度.以国产某型客机中央翼燃油箱为研究对象,给出了4种不同的富氮气体进气孔设置及2种气体分配方式,比较了它们对惰化过程的影响,结果显示,将富氮气体按体积平均方式通入所有的隔仓具有最好的惰化效果,而将进气孔口设置在外侧隔仓并单独进气的惰化效果最差,而且在中部对称位置的隔仓上设置进气孔优于非对称位置设置进气孔.
On the premise of no mass accumulation in the whole fuel tank and each compartment, a mathematical model that can automatically determine the flow direction and flow rate based on the pressure difference is established, and the steps of iterative method are given. Then, In the process of inerting, the relationship between the concentration of oxygen in each compartment and the number of ventilation was studied. The Boeing 747 central wing tank was compared with the experimental data published in the foreign literature to verify the high accuracy of the proposed model Taking a domestic passenger aircraft central wing fuel tank as the research object, four different nitrogen - rich gas inlet holes and two gas distribution modes are given, and their influence on the inerting process is compared. The results show that, Nitrogen gas has the best inerting effect when all the compartments are accessed by volume average. The inerting effect of setting the inlet port in the outer compartment and the single intake is the worst, and the compartment in the middle symmetrical position On the set than the asymmetric position of the inlet to set the inlet.