民用飞机客舱干燥系统的性能分析

飞机客舱内的湿空气很容易在舱壁冷表面结露,冷凝水不仅会给飞机带来额外重量而且会腐蚀机体结构,所以需要安装干燥系统对客舱顶部空气进行除湿处理。在做出合理假设的基础上建立了硅胶转轮的物理模型和数学控制方程,运用Jurinak模型对转轮出口参数进行了数值计算,基于3种指标和火用效率对干燥系统的性能进行了评估。结果表明,除湿量、除湿效率、除湿性能系数、火用效率的变化趋势并不相同,系统设计时需要权衡考虑各项指标,增加回热结构后系统的性能有明显提升。

Performance Analysis of the Desiccation System in Civil Aircraft Passenger Cabin

Normally the wet air condenses easily on the aircraft’s cabin cold surface. The condensed water brings extra weight and corrode the air-frame structure. So a desiccation system is established to deal with the air at the top of the passenger cabin. This paper establishes the physical model and mathematical control equations of the silica-gel desiccant wheel. Jurinak model was used to calculate the outlet parameters,and the system performance was evaluated based on 3 indexes and exergy efficiency. The results show that the changing trend of dehumidification capacity,dehumidification effectiveness,exergy efficiency,dehumidification COP are different;all indexes should be weighed in system design and the performance is obviously improved by adding heat recovery structure.