| Citation: | BAI Wentao, LIU Guotian, ZOU Bo, et al. Performance comparison of helicopter inerting system under different temperature control modes[J]. Journal of Beijing University of Aeronautics and Astronautics, 2022, 48(10): 2040-2047. doi: 10.13700/j.bh.1001-5965.2021.0073(in Chinese)
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The airborne hollow fiber membrane inerting system of a helicopter is taken as the research subject.in this paper. Two temperature control systems using an electric valve and a frequency conversion fan have been designed. Based on the AMESim platform and the calculated data of the separation membrane mathematical model, an airborne inerting system was built. Under the flight mission, the temperature control effect of the two systems, the variation of the performance of the inerting system at different flight stages, and the influence of key parameters were all studied. The results show that: the system with an electronic valve can maintain the bleed air temperature at the desired level of 90℃ throughout the flight. After take-off, the nitrogen concentration of nitrogen enriched air (NEA) is maintained between 91.5%-96.4%, the required bleed air flow rate is maintained between 40 kg/h-243 kg/h, and the oxygen volume fraction on ullage can be reduced to 9% within 180 s and kept below 9% throughout the flight. Under the premise of the heat exchanger selection that meets the temperature control and inerting requirements during the high temperature stages such as climb, acceleration, and descent, the bleed air is overcooled to about 0℃ during the cruise stage of the system with the variable frequency fan, although the required bleed air flow rate dropped to 26 kg/h, the concentration of NEA is greatly reduced to 81%, and the oxygen volume fraction on ullage rose to 18%. The larger the flying speed, the greater the temperature drop of bleed air and the lower the cruising altitude, the lower the minimum cruising speed required to meet the temperature control effect are all valid during the cruise phase of the system with the variable frequency fan.
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