摘要
缩比飞行试验在民用飞机的研制过程中日益受到重视,其尺度效应影响评估是设计缩比飞行试验工况的基础,也是确认飞行数据适用性的关键。基于几何和动力学相似准则,针对某民用飞机及其缩比验证机设计分析工况组,采用计算流体力学方法研究相似准则参数(马赫数Ma、雷诺数Re、弗劳德数Fr)对气动载荷、典型气动导数及弹性变形的影响。研究结果表明,在动力学相似时,验证机与原型机间的气动特性差异主要来源于马赫数,雷诺数影响较小;当原型机以中低马赫数(Ma<0.5)飞行时,此时马赫数压缩效应不明显,验证机与原型机具有近似的展向与弦向载荷分布特征,典型稳定导数及操纵导数差异约10%,在控制律设计鲁棒性范围内;进一步保持质量与刚度分布相似时,机翼翼尖扭转变形差异不超过0.5°,挠度差异不超过0.5%,在工程上属于可接受的范围。
Scale effect evaluation is the foundation for designing scaled flight test conditions and the key to validate the flight data in the development of civil aircraft.Based on geometric similarity and dynamic similarity criteria,the present paper utilizes computational fluid dynamics to analyze the effects of similarity criteria parameters such as Mach number,Reynolds number,and Froude number on aerodynamic loads,aerodynamic coefficients,and elastic deformation for a civil aircraft and its scaled model.Results demonstrate that when the dynamic similarity is satisfied,the differences between the prototype and its scaled model come from the Mach number whereas the effects of the Reynolds number is relatively small.When the prototype is flying at low Mach numbers(Ma<0.5),the compression effects are not significant,and the scaled prototype exhibits similar spanwise and chordwise load distribution characteristics,with typical stability coefficients and control coefficients differing by approximately 10%,which is within the robustness range for control law design.Furthermore,when maintaining similar mass and stiffness distributions,the maximum deflection of the wingtip twist does not exceed 0.5°,and the maximum deflection does not exceed 0.5%,which are acceptable for engineering applications.
作者
陈恺
吴大卫
孙宇辰
陈石
程攀
毛昆
CHEN Kai;WU Dawei;SUN Yuchen;CHEN Shi;CHENG Pan;MAO Kun(Shanghai Aircraft Design&Research Institute,Shanghai 201210,China)
出处
《空气动力学学报》
CSCD
北大核心
2024年第8期77-83,I0002,共8页
Acta Aerodynamica Sinica
关键词
缩比验证飞行
相似准则
尺度效应
气动特性
机翼
弹性变形
subscale flight testing
similarity criterion
scale effect
aerodynamic characteristics
wing
static elastic deformation
作者简介
陈恺(1995-),女,江苏泰兴人,工程师,研究方向:静气动弹性设计,无人飞行验证.E-mail:2497816916@qq.com;通信作者:吴大卫,研究员,研究方向:飞机总体设计,无人飞行验证.E-mail:wudawei@comac.cc。
