航空涡扇发动机吞水性能变化

Performance change of aero turbofan engine after swallowing water

为了解某涡扇发动机吞水后性能变化,基于常规地面试车台,设计并开展某涡扇发动机吞水后性能变化试验。进行了发动机在慢车状态、节流状态、中间状态和最大状态时,吞水量为进口空气质量流量的2%、3.5%和5%的试验。试验结果表明:慢车状态,风扇内、外涵出口温度的降低程度不随吞水量的变化而变化,吞水后发动机推力最多降低约20%;最大状态,风扇内涵出口温度降低的程度随着吞水量的增加而增加,吞水后由于低压转速提高,发动机推力最多升高约15%。吞水过程中没有造成失速、喘振以及发动机主燃烧室熄火。吞水后发动机性能无恶化。

In order to understand the turbofan engine performance change after swallowing water,the test of one turbofan engine performance change after swallowing water was designed and carried out on the conventional testing facility.When the engine was at idling,throttling,max speed,and afterburning,the mass of swallowing water was 2%,3.5%and 5%of the inlet air mass flow.The test results showed that:at the idling,the lowering degree of the inner and outer culvert outlet temperature of the fan did not change with the change of the mass of water swallowing,after swallowing water the engine thrust decreased about 20%at most;at the afterburning,the decreasing degree of the outer culvert outlet temperature of the fan grew with the increase of the mass of water swallowing,after water was swallowed,due to the low-pressure speed increase,engine thrust increased about 15%at most.No stalling,surge and flameout of the combustion chamber of the engine were caused during the swallowing process.Engine performance did not deteriorate after water was swallowed.