| Citation: | PENG Xiaotian, FENG Shiyu, REN Tong, et al. Performance of oxygen-consuming catalytic inerting system of fuel tank under flight envelope[J]. Journal of Beijing University of Aeronautics and Astronautics, 2021, 47(8): 1565-1570. doi: 10.13700/j.bh.1001-5965.2020.0283(in Chinese)
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In order to provide input parameters for the design of new types of oxygen-consuming inerting system components, based on the proposed low-temperature controllable oxygen-consuming catalytic inerting system flow, the system mathematical model is established based on the mass conservation and energy conservation equations with the suction flow rate at the outlet of fuel tank as the benchmark. Taking the central fuel tank as the object, the important performance changes of the inerting system under the full flight envelope and the influence of key parameters on it are simulated. The results show that: inerting system can effectively reduce the oxygen volume fraction. For example, under the condition of initial full load, 0.5 catalytic efficiency and 60 L/min suction flow, the oxygen volume fraction will reach below 12% after 24 minutes. During the flight, the volume fraction of gas phase oxygen in the fuel tank rises during the declining and approaching phases, while it is decreasing in other phases. The higher the catalytic efficiency is and the larger the fan flow is, the shorter the inerting time is required. When the catalytic efficiency is fixed, the same inerting time is achieved, and the maximum fan suction flow is required when there is no fuel load. Therefore, the oxygen-consuming catalytic inert system should be designed according to the most unfavorable no fuel load working conditions.
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