螺旋桨飞机起飞构型突风影响研究

Research on gust influence on propeller-driven aircraft in take-off

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 the aircraft with longitudinal instability at low angles of attack, gust causes obvious potential safety risk. Combined with gust models in flying qualities specification, gust strength variation at dif- ferent probability and height is provided. For a propeller-driven aircraft, the angle of attack variation caused by upward gust and downward gust are calculated separately, and feasible speed and height range are obtained. The results indicate that downward gust evidently weakens take-off longitudinal stability of this type of aircraft, and upward gust obviously weakens the safety margin of angle of attack.