飞机燃油系统活门关闭特性分析和试验研究

Analysis and Experimental of Valve Closing Characteristics of Aircraft Fuel System

随着飞机燃油系统的广泛应用,由于压力和流量的增大,燃油系统活门在关闭过程中容易出现结构变形,导致活门出现卡死和无法完全关闭的现象。通过建立球形燃油活门的三维流固耦合动力学模型,基于Workbench平台,对活门关闭过程瞬态特性进行仿真分析。结果表明:流道中活门关闭旋钮为易变形结构,在流体压力作用下变形量较小;变形量随开度呈非线性正相关变化,在进口压力逐渐增大时,压力差随之变大,此时活门无法正常关闭;对同类活门做对比分析试验,发现仿真和试验结果基本吻合,提出适当降低流量和压力是延长活门寿命的重要方法。

With the widespread application of aircraft fuel systems,structural deformation occurs due to the increase in pressure and flow during the closing process of the fuel system valve,which causes the valve to jam and fail to fully close.Simulation analysis based on the Workbench platform of the transient characteristics of the valve closing process is carried out by establishing a three-dimensional fluid-solid interaction dynamic model of the spherical fuel valve.The results show that the valve closing knob in the flow channel has a variable structure,and the deformation is small under the action of pressure;the deformation changes with the opening degree in a non-linear positive correlation,and the pressure difference becomes larger when the inlet pressure increases gradually.The valve cannot be closed normally at this time,comparative analysis of similar valves is carried out.It is found that the simulation results are basically consistent with the experimental results,and it is suggested that reducing flow rate and pressure is an important method to prolong valve life.