航空学报2025，Vol.46Issue(2)：132-144,13.DOI:10.7527/S1000-6893.2024.30618
基于动力学模态分解的柔性膜翼增升机制
Lift improvement mechanism of membrane airfoil using dynamic mode decomposition
摘要
Abstract
Membrane airfoils can adaptively improve the flow distribution on the surface of the airfoil using aeroelastic effects in the low Reynolds number flow,which offers a novel aerodynamic design concept for smart aerocraft.In this paper,the membrane material is directly applied to the design of airfoil.Numerical calculations for the fluid-structure in-teraction of the membrane airfoil with different angles of attack and length of membrane are conducted.Modal analysis of the flow field of the membrane airfoil is performed based on dynamic mode decomposition.The results indicate that compared to the rigid airfoil,the membrane airfoil shows lift enhancement when there exists a lock-in phenomenon be-tween the flow and the membrane structure.The lift enhancement of the membrane airfoil at the angle of attack of 16° is 21.74%,which is attributed to the energy feedback of pressure propagation generated by membrane vibration on the shear layer of the flow.The lift enhancement of the membrane airfoil with the length of membrane of 0.65 times the chord length is 14.22%.The upper surface of the membrane airfoil in this configuration can generate a down-stream pressure propagation with a large pressure phase gradient,which allows the flow on the surface can obtain the maximum energy from structural vibration feedback.The lift enhancement of the membrane airfoil in this configuration is much greater than that in other configurations.The proposed methods and research conclusions can provide impor-tant theoretical support for active flow control.关键词
柔性膜翼/动力学模态分解/增升效应/能量反馈/流动控制Key words
flexible membrane airfoil/dynamic mode decomposition/lift improvement/energy feedback/flow control分类
航空航天引用本文复制引用
胡仕林,陈柄宙,康伟..基于动力学模态分解的柔性膜翼增升机制[J].航空学报,2025,46(2):132-144,13.基金项目
国家自然科学基金(11972307) （11972307）
航空科学基金(JCKY2021204B141) National Natural Science Foundation of China(11972307) （JCKY2021204B141）
Aeronautical Science Foundation of China(JCKY2021204B141) （JCKY2021204B141）
