航空发动机推力矢量喷流特性影响模拟研究

Simulation of the Vector Jet Effect on the Aircraft Engine

摘要:

航空发动机主要通过试验手段开展矢量推力研究，仅得到了宏观特性影响，对于流动结构变化规律分析较少。基于国产 NNW-FSI V1.0 软件平台，采用类五代战斗机构型标模，进行全机带矢量喷流一体化数值模拟，研究航空发动机推力矢量喷流特性对全机气动特性的影响规律。首先进行网格收敛性及与试验结果的一致性研究；然后针对有/无喷流条件对该标模进行流动模拟，并分别从气动特性曲线、表面流态、压力系数云图三个方面进行分析，研究喷管偏转、攻角变化以及喷流效应对该战斗机构型气动特性的影响规律。结果表明：网格收敛性且与试验结果一致性较好，喷管偏转对升力特性影响明显，与试验结果规律性吻合较好，喷流效应会随着攻角增大而增大。

Abstract:

Based on the NNW-FSI V1.0 software, the flow past Fifth generation fighter configuration is simulated. The flow with and without jet are all studied. Aerodynamic force coefficient, pressure distribution and flow pattern on the surface are analyzed. The deflection of the nozzle, change from the angle of attack and the vector jet effect that influence the aerodynamic characteristics of the Fifth generation fighter configuration standard model are studied. The numerical results agree well with the experimental data. The deflection of the nozzle change the lift character, the jet effect accelerates with the angle of attack.