Calculating method for matching enthalpy parameter of four-wheel-bootstrap refrigeration system for civil aircraft
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摘要: 国外先进民机座舱制冷系统已采用高性能四轮升压式高压除水制冷系统.针对传统的系统参数匹配方法复杂的特点,引入焓参数法建立了四轮升压式高压除水制冷系统匹配计算模型,用所建模型进行了匹配计算,并分析了流比、风扇功率比参数和涡轮功率比参数对系统性能的影响.计算结果表明:用焓代替温度作为系统各附件热力计算的状态参数,使得物理概念清晰,匹配过程简单,编程易于实现.避免了重复计算各附件连接点湿空气的饱和含湿量,简化了换热器的热力计算过程.研究成果为大飞机的研制提供了一定的理论指导.Abstract: The foreign advanced civil airplane cabin refrigeration system has been developed from three-wheel-bootstrap to four-wheel-bootstrap high pressure water-separation system. The traditional method used for matching the system thermal parameters was complicated. A new model for calculating the enthalpy parameters was proposed and used for the matching calculation. The gas flow ratio, fan power ratio and the turbine power ratio were introduced and their effect on system performance was analyzed. The results show that the use of enthalpy instead of temperature as the state parameter of the system accessories is of a clear physical concept, and can be easily programmed and avoid double counting of the saturated humidity of the connection points between accessories, and can also simplify the heat exchanger thermodynamic calculation and reduce the iteration times of the system. The results can provide a theoretical guidance for civil aircraft researches.
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Key words:
- aircraft /
- cabin /
- enthalpy /
- refrigeration
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