The research of aerodynamic characteristics of high-lift configuration of large transport plane with the effect of engine jet

To satisfy the design request of efficiency and stability of high-lift system of large transport plane, by the method of CFD (Computational Fluid Dynamic), the research of aerodynamic characteristics of high-lift configuration of large transport plane with the effect of engine jet has been done. The result of numerical simulation demonstrates that with the effect of engine jet, the maximum lift coefficient increases by 46.2%, and the stall angle increases by 11 degrees, longitudinal stability factor decreases by 30.89%. Conclusion can be obtained by analyzing the physics characteristics of flow that the engine jet not only changes local flow fluid of flap after the engine but also changes the local flow fluid on the upper surface of nacelle and main wing and the local angle of attack of horizontal tail. Given the conclusion obtained above, during the procession of designing highlift configuration of STOL transport airplane, for the lift characteristics the effect of engine jet on the local flow fluid of each part has to be considered; for the pitch moment characteristics the reverse effect of engine jet increasing nosedown pitching moment of wing and decreasing that of horizontal tail must to be weighted.