Aerodynamic characteristic analysis of high-aspect ratio elastic wing
-
摘要: 长航时无人机在飞行过程中受气动载荷影响,其大展弦比机翼产生弯曲和扭转变形,这种弹性变形严重影响飞机的飞行性能和飞行安全,不能将此种飞机机翼当作传统的刚性机翼进行气动分析.针对一真实复合材料大展弦比前掠机翼,采用气动/结构一体化的分析方法,利用计算流体动力学(CFD)软件FLUENT和计算结构动力学(CSD)软件NASTRAN联合求解,研究了在不同载荷情况下大展弦比柔性机翼静气动弹性变形对机翼气动特性的影响.结果表明,大展弦比无人机机翼受载变形后升阻比降低,滚转力矩和偏航力矩显著增大,对飞机的纵向和横侧向气动性能产生不利影响,同时也证明此CFD/CSD耦合计算方法可以应用到柔性机翼的气动/结构一体化设计中.Abstract: The aerodynamic performance and flying safety of long-endurance unmanned aerial vehicle (UAV) are largely affected by the aeroelastic distortion of its high-aspect ratio wing. High-aspect ratio wing of UAV is bended and twisted by the air load during flight and couldn-t be treated as a traditional rigid wing. The effect of static aeroelastic distortion to the aerodynamic characteristic for a real high-aspect ratio sweepforward wing of composite material under different load statuses was analyzed. The integrated design method combined aerodynamic with structural was adopted in this analysis using associated computational fluid dynamics (CFD) program FLUENT and computational structual dynamics (CSD) program NASTRAN. The result shows a lift-drag ratio drop and a remarkable increase on rolling and yawing moments which affect the portrait and lateral aerodynamic performance of UAV negatively. The result also shows that the CFD/CSD coupling computational methodology is reliable to be used aerodynamic-structural integrated design of elastic wing.
-
[1] Palacios R, Cesnik C. Static nonlinear aeroelasticity of flexible slender wings in compressible flow . AIAA-2005-1945,2005 [2] 邓立东,李天. 柔性飞机的非线性飞行载荷计算研究[J].飞行力学,2004,22(4):85-88 Deng Lidong, Li Tian. Research of nonlinear flight loads calculation on a flexible aircraft[J]. Flight Dynamics, 2004, 22(4):85-88(in Chinese) [3] Pesonen U, Agarwal R. Artificial network prediction of aircraft aeroelastic behavior . AIAA-2002-0947, 2002 [4] Gumbert C, Newman P, Hou G. Effect of random geometric uncertainty on the computational design of a 3-D flexible wing . AIAA-2002-2806,2002 [5] Panza J, Mak S. Aeroservoelastic analysis of a NASA-ALTAIR air vehicle . AIAA-2003-6500,2003 [6] 徐敏,安效民,陈士橹. 一种CFD/CSD耦合计算方法[J].航空学报,2006,27(1):33-37 Xu Min, An Xiaomin, Chen Shilu. CFD/CSD couping numerical computational methodology[J]. Acta Aeronautica et Astronautica Sinica, 2006,27(1):33-37(in Chinese) [7] 刘金辉.考虑弹性变形的机翼气动-结构多学科优化设计 . 西安:西北工业大学,翼型、叶栅空气动力学国防科技重点实验室, 2005 Liu Jinhui. Multidisciplinary aerodynamic-structure optimization design of the elastic wing .Xi-an:National Key Laboratory of Aerodynamic Design and Research, Northwestern Polytechnical University, 2005(in Chinese) [8] B.埃特肯著. 大气飞行动力学[M]. 北京:科学出版社,1979 Etkin B. Dynamics of atmospheric flight [M]. Beijing:Science Press, 1979(in Chinese) 期刊类型引用(4)
1. 周红华，黄辰，肖伟剑，陈向进，兰景权，许志刚，汪倍吉. 移动通信基站电磁辐射环境影响仿真预测与评价. 环境影响评价. 2020(03): 57-62 . 
百度学术2. 周红华，黄辰，肖伟剑，陈向进，兰景权，汪倍吉，许志刚. ±45°双极化通讯基站正向地面电磁辐射随角度变化的预测——通讯基站50m内电磁辐射环境超标范围3D准确仿真预测实验之二. 海峡科学. 2019(01): 8-13 . 百度学术3. 吴雅琴，杨硕，师兰兰. 基于位置指纹与PDR融合的室内定位算法研究. 矿业科学学报. 2019(05): 448-454 . 百度学术4. 周红华，黄辰，肖伟剑，兰景权，陈向进，许志刚，汪倍吉. 通讯基站50m内轴向发射电磁辐射预测——通讯基站50m内电磁辐射环境超标范围3D准确仿真预测实验之一. 海峡科学. 2018(11): 27-31 . 百度学术其他类型引用(1)
-
百度学术
点击查看大图
计量
- 文章访问数: 4510
- HTML全文浏览量: 28
- PDF下载量: 2088
- 被引次数: 5
下载:
