Abstract
According to the inert gas filling requirements of a certain type of aircraft fuel tank, three different inlet and outlet layout plans are designed. Based on CFD, the simulation calculation of the inert gas filling effect of the fuel tank under different inlet and outlet layout plans is calculated. The changes of the oxygen volume fraction (Vo2) in the gas space in the tank under different inert gas flow rates, concentrations and fuel load are analyzed. The calculations show that with the increase of inerting time, the average Vo2 in the tank decreases, and finally tends to the Vo2 of inert gas. Considering the overall average Vo2 of the tank and the uniform distribution of inert gas in the gas space of each tank, it can be seen that the best inerting performance can be achieved by adopting the inlet and outlet layout plan 3. The calculation results can provide a basis for the optimization of the gas distribution design of the tank inerting system.
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