期刊
JOURNAL OF FLUID MECHANICS
卷 862, 期 -, 页码 871-888出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/jfm.2018.966
关键词
flow-structure interactions; propulsion; swimming/flying
资金
- Government of Israel
- US Army Natick Soldier Systems Center
We present a theoretical framework to characterize the steady and unsteady aeroelastic behaviour of compliant membrane wings under different conditions. We develop an analytic model based on thin airfoil theory coupled with a membrane equation. Adopting a numerical solution to the model equations, we study the effects of wing compliance, inertia and flapping kinematics on aerodynamic performance. The effects of added mass and fluid damping on a flapping membrane are quantified using a simple damped oscillator model. As the flapping frequency is increased, membranes go through a transition from thrust to drag around the resonant frequency, and this transition is earlier for more compliant membranes. The wake also undergoes a transition from a reverse von Karman wake to a traditional von Karman wake. The wake transition frequency is predicted to be higher than the thrust-drag transition frequency for highly compliant wings.
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