飞机机身内供油管路柔性接头单侧泄漏故障数值研究

基于Fluent软件，采用数值仿真方法研究了飞机机身内主供油管路与APU供油管内管管路柔性接头发生极端泄漏时的特征，以及泄漏速率与工作压力的定量关系。当管路柔性接头单侧密封圈缺失时，管路燃油泄漏量均与工作压力呈线性正相关关系；除管内工作压力外，燃油泄漏速率还受管路几何尺寸和喉道尺寸的显著影响，但柔性接头卡套缺失不构成影响燃油泄漏速率的主要因素。

Numerical Study on Unilateral Flexible Coupling Leakage of Refuel Tube within Fuselage Contour

For the APU/main engine refuel tube within fuselage contour, some critical leakage malfunctions were studied by numerical simulation method based on Fluent. After analyzing the flow feature of APU/main engine refuel tube leakage, which caused by the missing of one seal within the inner flexible coupling, the relationship between leakage flux and refuel pressure can be concluded that the leakage flux increases with refuel pressure increasing. Besides refuel pressure, the leakage flux is influenced obviously by the tube size and the tube manufacture precision, while the simulation result also shows that the simultaneous missing of a clamshell body affects the leakage flux little.