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由于螺旋桨滑流的影响,某运输机起飞构型在小迎角时纵向稳定性裕度不足,甚至不稳定,给飞机带来安全隐患。分析了某运输机起飞构型纵向力矩特性,讨论了螺旋桨滑流对纵向静稳定性的影响、影响飞机起飞时的安全因素和进入小迎角飞行的条件,建立了飞机起飞的数学仿真模型,通过大量的仿真计算,研究了突风和驾驶员误操纵对飞机起飞安全性的影响,给出了起飞时飞机所能抗御的最大突风速度。研究结果表明,某运输机小迎角稳定裕度不足,不稳定对飞机安全起飞的影响可以不予考虑。
Due to the influence of the propeller slipstream, the vertical stability margin of a certain take off configuration at the low angle of attack is insufficient or even unstable, which brings potential safety hazard to the aircraft. The longitudinal torque characteristics of take-off configuration of a transport aircraft are analyzed. The effects of propeller slipstream on longitudinal static stability, the safety factors during take-off and the conditions of entering low-angle flight are discussed, and the mathematical simulation model of take-off is established. A large number of simulation calculations are conducted to study the effect of gusting and pilot misoperation on the take-off safety of the aircraft. The maximum gust blowing speed that the aircraft can resist during takeoff is given. The results show that the stability margin of a small angle of attack of a transporter is insufficient and the influence of instability on the safe takeoff of the aircraft can not be considered.