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对于小迎角纵向静不稳定飞机,突风给飞机带来显著的安全隐患,为此,结合飞行品质规范中的突风模型,给出不同概率和不同高度下的突风速度。针对某螺旋桨飞机,计算分析垂直向上和向下突风所引起的飞机迎角变化,获得了起飞状态下可行的飞行速度和高度范围。研究结果表明,垂直向下突风显著地削弱了该类飞机的纵向静稳定性;垂直向上突风显著地减小了其安全迎角裕度。
For low angle of attack vertical static unstable aircraft, gust brings significant safety hazard to the aircraft. Therefore, combined with the gust model in the flight quality specification, the gushing speed under different probabilities and different heights is given. For a certain propeller plane, the change of the angle of attack of the aircraft caused by the vertical upward and downward gusts is calculated and analyzed, and the feasible flight speed and altitude range are obtained under take-off condition. The results show that the vertical downward gust significantly wears down the longitudinal static stability of this type of aircraft; vertical upward gust significantly reduces its safe angle of attack margin.