摘要
采用自由飞模型研究螺旋桨动力飞机失速特性时,为了模拟螺旋桨动力,必须采用带动力模型,而螺旋桨动态特性会影响自由飞模型的动力学特性。为了提高自由飞模型试验效率,研究了自由飞模型飞行品质以及螺旋桨动态特性对飞行品质的影响,采用静态气动数据,初步预测了模型的大迎角偏离特性。研究结果表明,自由飞模型螺旋模态不稳定,试验中必须设计相应的增稳控制律,螺旋桨拉力动态显著增加了自由飞模型的速度稳定性;迎角大于10°之后,横航向力矩系数非线性明显,12~14°可能出现操纵偏离。
A powered model is needed to simulate propeller’s slipstream influence when free flight model is used to research the stall characteristics of propeller powered aircraft.For the purpose of improving the efficiency of free flight test,the flight quality and influence of the propeller were researched,based on static aerodynamic statistics,high angle departure characteristics were predicted.The result shows:spiral mode is unstable,thus,augmentation control law is needed.Moreover,the propeller improves the speed stability of free flight model;when attack angle surpasses 10°,lateral and directional moment coefficient becomes nonlinear and manipulation departure appears,which must be paid enough attention to in the flight test.
作者
王亚龙
张立丰
WANG Yalong;ZHANG Lifeng(Chinese Flight Test Establishment,Xi'an 710089,China)
出处
《飞机设计》
2020年第3期14-17,共4页
Aircraft Design
关键词
螺旋桨动力
飞行品质
速度稳定性
偏离特性
propeller power
flight quality
speed stability
departure characteristics
