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飞机气动力特性是飞机特性的基本表征。发动机的引流对气动力的影响直接关系到气动力建模的准确性、飞行品质和飞行安全。将真实涡喷发动机安装在某缩比验证飞机内,较逼真地研究了发动机推力大小、空气流动速度大小和方向等对气动力的影响。结果表明,发动机引流对验证机气动力的影响主要体现在轴向力、法向力和俯仰力矩上,发动机推力越大,引流效果越明显,且在超过失速迎角后的某迎角处法向力和俯仰力矩的增量达到最大值;而在不同侧滑角、一定风速范围内以及舵面偏转等情况下,发动机引流引起的气动力增量主要表现在失速迎角附近。因此在进行大迎角机动研究时,必须考虑发动机引流对气动力的影响。
Aircraft aerodynamic characteristics are the basic characteristics of the aircraft. The influence of engine drainage on aerodynamics is directly related to the accuracy of aerodynamic modeling, flight quality and flight safety. The real turbojet engine installed in a reduction ratio verification aircraft, a more realistic study of the engine thrust, the size and direction of the air flow velocity and other aerodynamic effects. The results show that the influence of engine drainage on the aerodynamic performance of the validator is mainly reflected in axial force, normal force and pitch moment. The larger the engine thrust, the more obvious the drainage effect. At an angle of attack beyond the attack angle of attack The increment of force and pitch moment reached the maximum value. However, under different sideslip angle, certain wind speed range and deflection of rudder surface, the aerodynamic increment induced by engine drainage mainly appeared near the stalling angle of attack. Therefore, in the study of maneuvering at high attack angles, the influence of engine drainage on aerodynamics must be considered.