某型高级教练机尾旋特性预测研究

Prediction of spin characteristic for a certain advanced trainer

首先,利用各种判据分析了某型高级教练机的失速偏离特性和尾旋敏感性,建立了尾旋运动的动力学模型;其次,分析比较了两种尾旋运动的分解方法,并在此基础上建立了气动力数学模型;最后,对某型高级教练机尾旋时间历程进行了数值仿真,结果表明,基于Kalviste运动分解并结合大迎角静态、旋转天平及强迫振荡试验数据,可以较准确地预测飞机的大迎角尾旋特性,有利于指导后期的真实大迎角/失速/尾旋试飞。

Firstly,the departure characteristic and spin sensitivity were analyzed by some criteria for a certain advanced trainer.Then,the mathematic model of spin was given in the form of vectors.And then,two decomposing methods of motion were analyzed and the aerodynamic coefficient was built up respectively.Finally,a numerical example was given for predicting the departure and spin characteristic for a certain advanced trainer.The simulation results demonstrated that Kalviste decomposing method,combining with high angle-of-attack static,rotary-balance and forced-oscillation data,could correctly predict the spin characteristics for a certain advanced trainer.The prediction method also provides a theory basis for spin maneuvers at high angle of attack.