航空燃油泵入口回流抑制方法研究

Study on Suppression Method of the Backflow at the Inlet of Aviation Fuel Pump

航空燃油泵性能曲线即增压值随流量增大逐渐降低称为单调下降,随着横梁自密封航空燃油泵的广泛应用,在其小流量工况下流量—增压值性能曲线会出现马鞍形现象,这样会给产品带来运行不稳定及系统不可靠等问题。通过数值模拟分析发现,小流量时入口会出现旋涡导致燃油回流,从而影响泵的单调下降特性。本文提出了一种抑制小流量时入口回流的方法,即增加入口导流板。数值模拟及试验结果表明,小流量时入口回流明显改善,从而减小入口水力损失,保证了燃油泵性能曲线单调下降的特性。研究结果可为其他航空燃油泵性能曲线单调下降的优化设计提供参考。

The performance curve of aviation fuel pump,namely,the pressurization value decreases gradually with the increase of flow rate,is called monotone decline.With the application of beam self-sealing aviation fuel pump and under the condition of small flow rate,the performance of flow-pressurization value will appear saddle phenomenon,which will bring unstable operation of the product and the reliability of the system.Through the numerical simulation analysis,it is found that the fuel reflux occurs when the pump is full,which affects the monotonic descent characteristics of the pump.A kind of increasing inlet diversion plate is proposed to suppress small flow rate.Numerical simulation and experimental results show that the small flow is significantly improved,thus,the inlet hydraulic loss is reduced and the characteristic of monotonic energy curve is guaranteed.The results can provide reference for the optimization design of other aviation fuel pump performance line monotonic decline.