基于可用能的多电飞机能量利用率分析方法

Analysis Method of More-electric Aircraft Energy Efficiency Based on Exergy

为了分析复杂多电飞机系统的能量使用情况,将模块化系统建模与可用能分析方法相结合构造出一种能量利用率分析方法。利用该方法将多电飞机系统分成动力、电力、液压、机体、防冰除冰、环境控制和座舱等子系统,在完整巡航任务剖面内计算各子系统可用能的分配和使用情况,分析相同飞行状态下不同子系统以及相同子系统在不同飞行状态下的能量利用率。所采用的燃料可用能计算公式不仅考虑了化学能还考虑了燃烧状态的影响。结果显示,多电飞机中可用能损失主要发生在发动机中,液压作动系统紧随其次;防冰除冰单元在飞机盘旋阶段的可用能效率较低,在起飞着陆阶段效率较高。

To analyze the energy efficiency of more-electric aircraft,the modular modeling of a system and exergy analysis are combined constructing an analysis method of energy efficiency.Using this new method,the system of a more-electric aircraft is decomposed into pieces,including the propulsion system,electric system,hydraulic system,frame,anti-icing ＆ deicing system,environmental control units and cabin.In addition,the exergy distribution and efficiency among the various subsystems are calculated during a completed cruise mission.Energy efficiency of the same sub-system working in different phases and of different sub-systems working in the same flight phase are also analyzed.The combustion state term which influences the formula of fuel exergy is taken into consideration along with the chemical energy.The result shows that exergy destruction of a more-electric aircraft occurs mainly in the engine,followed next by the hydraulic actuation system.The antiicing ＆ de-icing unit exhibits good efficiency during takeoff and landing,but not so good in the holding phase.