不确定性条件下大型客机纵向静稳定性数值研究  

Numerical Study on Longitudinal Static Stability of Large Aircraft Under Uncertainty

作　　者：娄刻强 王晓东[1] 于佳鑫 陈江涛[2] LOU Keqiang;WANG Xiaodong;YU Jiaxin;CHEN Jiangtao(Key Laboratory of Power Station Energy Transfer Conversion and System,Ministry of Education,North China Electric Power University,Beijing 102206,China;China Aerodynamics Research and Development Center,Mianyang 621000,China)

机构地区：[1]华北电力大学电站能量传递转化与系统教育部重点实验室,北京102206 [2]中国空气动力研究与发展中心,绵阳621000

出　　处：《工程热物理学报》2023年第6期1572-1582,共11页Journal of Engineering Thermophysics

基　　金：国家数值风洞工程项目课题(No.NNW2018-ZT7B14)。

摘　　要：飞机的几何不确定性和飞行中的来流不确定性常会引起飞机焦点位置的改变,进而影响飞机的静稳定性。采用CFD数值模拟方法对CHNT客机标模开展气动特性与静稳定性研究,基于非嵌入式概率配置点法,分析在机翼安装角和来流马赫数为不确定性参数情况下的飞机纵向静稳定性。计算结果表明,机翼安装角的正偏差将引起C_(M)曲线临界位置攻角的前移,翼根处分离流动增大,飞机焦点位置前移,纵向静稳定性减弱,俯仰力矩系数曲线导数C_(M)^(α)的PDF、CDF曲线形状类似Beta分布;来流马赫数的不确定性对焦点位置的影响显著,马赫数的正偏差可使飞机焦点位置后移,增强纵向静稳定性,C_(M)^(α)的PDF、CDF曲线形状也类似Beta分布。The geometric uncertainty of the aircraft and the uncertainty of the incoming fow in fight often cause the change of the focal position of the aircraft,and then affect the static stability of the aircraft.CFD numerical simulation method is used to study the aerodynamic characteristics and static stability of the standard model of CHNT aircraft.Based on the non-intrusive probabilistic collocation point method,the longitudinal static stability of the aircraft is analyzed when the wing mounting angle and the Mach number are uncertain parameters.The calculation results show that the positive deviation of the wing mounting angle will lead to the forward movement of the attack angle at the critical position of the C_(M) curve,the increase of the separated flow at the wing root,the forward movement of the aircraft focus position,the weakening of the longitudinal static stability,and the PDF and CDF curves of the C_(M)^(α)(the derivative of the pitching moment coefficient curve)are similar to Beta distribution;The uncertainty of Mach number has a significant impact on the focus position.The positive deviation of Mach number can make the focus position of the aircraft move backward and enhance the longitudinal static stability.The PDF and CDF curves of the C_(M)^(α)are also similar to Beta distribution.

关 键 词：不确定性 纵向静稳定性 机翼安装角 来流马赫数 

分 类 号：TK83[动力工程及工程热物理—流体机械及工程]