基于量纲分析法分析民用飞机燃油系统管路结冰特性
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    摘要:

    飞机在飞行的各阶段,燃油与大气中混入的水分会进入燃油系统。由于外界温度降低,系统管路的管壁会发生结冰现象,从而影响管路供油压力及供油量。燃油系统管路结冰会影响飞机发动机的运行安全,从而威胁飞行安全。因此,研究燃油系统管路结冰特性对于优化燃油系统设计具有重要作用。为分析民用飞机燃油系统管路结冰特性,本文基于试验数据,采用量纲分析法建立了可以初步用于计算管路结冰试验的压降计算模型。通过对比计算结果和试验结果,结果表明:在所选试验范围内,管路结冰试验的压降模型计算结果与试验变化趋势一致,平均相对误差10.35%;管路直径越小,管路结冰造成的压降损失越大;温度越低,管路结冰造成的管路压降越大,当温度低于-11℃后,压降增大的速率变小。

    Abstract:

    During all stages of the flight, the water in fuel and the moisture in the atmosphere will enter the fuel system. As the external temperature decreases, the pipe wall of the fuel system will freeze, which will affect the pressure and quantity of oil supply. The icing in the fuel system pipeline will affect the safety of the aircraft engine, thereby threatening the flight safety. Therefore, it is important to study the icing characteristics of fuel system pipeline for optimizing fuel system design. In order to analyze the icing characteristics of the fuel system pipeline for civil aircraft, based on the test data, the pressure drop calculation model and the icing quantity calculation model were established by using dimensional analysis. By comparing the results of calculation and experiment, within the selected test range, the results show that the calculated results of the pressure drop model of pipeline icing test are consistent with the changing trend of the test, and the average relative error is 10.35%; the smaller the pipeline diameter, the greater the pressure drop loss caused by pipeline icing; the lower the temperature, the greater the pressure drop caused by pipeline icing; when the temperature is lower than -11 ℃, the increasing rate of pressure drop decreases.

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引用本文

段安鹏.基于量纲分析法分析民用飞机燃油系统管路结冰特性[J].民用飞机设计与研 究,2020(3):67-72DUAN Anpeng.[J]. Civil Aircraft Design and Research,2020,(3):67-72. ( in Chinese)

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  • 在线发布日期: 2020-10-15
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