Supervisor:
Southwest Ordnance Industry Bureau
Organizer:
Chongqing Ordnance Industry Society
Chongqing University of Technology
Chongqing University of Technology
Investigation of the effect of complex motion during clap fling on the lift performance of bristled wings
| DOI: | 10.11809/bqzbgcxb2024.02.022 |
| Keywords: | bristled wing; clap fling; overset mesh; lift; Reynolds number; translation rotation overlap percentage |
| Abstract: | Bristled wing is a prospective approach to further miniaturization of aircraft. Clap fling with translation rotation overlap is often used by bristled wing insects during hovering. To understand the effect of translation rotation overlap on lift performance, Computational Fluid Dynamics (CFD) model of a pair of bristled wings was developed using the overset mesh method. The viscous effect of bristled wings during hovering was analyzed, and the effect of translation rotation overlap percentage on lift coefficient was studied. The results indicate that: 1) as the chord length based Reynolds number increases from 10 to 80, the bristle gap leakage increases, and the pressure difference between both sides of the wing and the leakage rate to Reynolds number ratio decrease, resulting in decreasing pressure and shear contribution to lift, and a decreasing lift coefficient; 2) by using high translation rotation overlap percentage, the fluid leaks through the bristle gap in an opposite direction to the bristle motion, forming upward resultant shear force during clap and upward resultant pressure force during fling, such that the negative lift peaks during clap and fling can be converted into positive lift peaks and the average lift coefficient can be significantly increased. |
| Published: | 2024-02-28 |