民用飞机燃油温度指示系统研究

Research on fuel temperature indicating system of civil aircraft

民用飞机设置燃油温度指示系统对燃油箱内的燃油温度进行持续监控,以避免燃油结冰,并确保燃油系统向发动机/APU提供的燃油符合温度要求。介绍了民用飞机燃油温度指示系统的组成和设计要点,以单通道民用客机为例对燃油温度告警设定考虑因素及告警值设定、告警等级及飞行员操作等进行分析。提出燃油温度传感器安装位置应考虑飞机燃油泵安装位置及耗油顺序、耗油规律,燃油温度告警类型应考虑飞机系统设计架构,针对飞行过程中燃油箱内燃油温度会增高的构型设置高温告警,除特殊构型外应设置燃油低温告警,燃油低温告警阈值应综合考虑燃油冰点、发动机/APU正常工作所需的入口燃油温度,确保燃油箱内的燃油温度符合要求。低油温告警触发后,飞行员应结合燃油种类及冰点对飞机进行操作。

Civil aircraft is equipped with fuel temperature indicating system to continuously monitor the fuel temperature in the fuel tank to avoid fuel freezing and ensure that the fuel supplied to the engine/APU meets the temperature requirements.This paper introduces the composition and design points of the fuel temperature indication system for civil aircraft,and takes a single-aisle civil airliner as an example to analyze the fuel temperature alarm setting considerations,alarm value setting,alarm level and the pilot's operation.It is proposed that the fuel temperature sensor installation location should consider the aircraft fuel pump installation location,fuel consumption sequence and fuel consumption law,the fuel temperature alarm should consider the aircraft system design configuration,and set the high temperature alarm for the configuration that the fuel temperature in the fuel tank will increase during flight,and the fuel low temperature alarm should be set in addition to the special configuration.The low fuel temperature alarm threshold should take into account the fuel freezing point and the inlet fuel temperature required for the normal operation of the engine/APU to ensure that the fuel temperature in the fuel tank meets the requirements.After the low fuel temperature alarm is triggered,the pilot should operate the aircraft according to the fuel type and freezing point.