非定常自由来流对飞机过失速机动特性的影响研究  

The effects of unsteady free stream on the post stall maneuvering aircraft

作　　者：史志伟[1] 尹江辉[1] 明晓[1] 

机构地区：[1]南京航空航天大学航空宇航学院,江苏南京210016

出　　处：《空气动力学学报》2008年第4期486-491,共6页Acta Aerodynamica Sinica

基　　金：高等学校博士学科点专项科研基金(20020287006)

摘　　要：在南航非定常风洞内,对三角翼模型在定常和非定常自由来流中做俯仰运动的动态气动特性进行了实验研究。利用模糊逻辑建模方法,对实验获得的非定常气动力数据进行了建模,并将非定常气动力模型应用于过失速机动中70°迎角定直飞行的仿真计算,分析了含自由来流非定常变化影响的非定常气动力数据对过失速机动飞行特性产生的影响。研究表明,考虑自由来流非定常变化的非定常气动力对飞机飞行过程中运动参数的变化和控制律设计都产生较大影响。因此在新一代战斗机的设计、研制中,深入研究飞机的非定常气动特性是十分必要的。In the unsteady wind tunnel of NUAA, the unsteady aerodynamic characteristics of a pitching alone delta wing and the pitching delta wing coupled with unsteady free stream are tested. Using the Fuzzy Logic Model method,the unsteady aerodynamic models based on test data are developed. The performances of flying at 70 degree angle of attack are calculated using these unsteady aerodynamic models. The effects of unsteady free stream on the performance of post stall maneuvering aircraft are analyzed. The results show that, unsteady aerodynamics of oscillating free stream is very important for the flight performance and controller design. This means that we must consider the effects of oscillating free stream in the design of future supermaneuverability fighters.

关 键 词：非定常自由来流 三角翼 俯仰运动 模糊逻辑建模 过失速机动 

分 类 号：V211.7[航空宇航科学与技术—航空宇航推进理论与工程]