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Journal of Flow Visualization and Image Processing
SJR: 0.11 SNIP: 0.312 CiteScore™: 0.1

ISSN Print: 1065-3090
ISSN Online: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.2015013527
pages 243-260

EXPERIMENTAL INVESTIGATION OF 2D FLEXIBLE PLUNGING HYDROFOIL

Ruijun Tian
New Mexico State University, Las Cruces, NM 88003
Robert Mitchell
New Mexico State University, Las Cruces, NM 88003
Leonardo Martin-Alarcon
New Mexico State University, Las Cruces, NM 88003
Fangjun Shu
Department of Mechanical and Aerospace Engineering New Mexico State University MSC 3450, P.O. Box 30001, Las Cruces, NM 88003-8001

ABSTRACT

It has long been hypothesized that the flight of birds and insects greatly benefits from the flexibility and morphing facility of their wings. A significant advantage that flapping flexible wing models have over quasi-steady rigid wing models was a much higher lift generation capability. Both experimental and computational studies have shown that the leading edge vortex (LEV) plays an important role in this higher lift generation. In this study, we further explore the internal mechanisms behind the production of these high lift forces. Two NACA0012 miniature wings, one flexible and one rigid, were actively plunged at various frequencies in a viscous glycerol-water solution. Two-dimensional, phase-locked particle image velocimetry (PIV) measurements were conducted to investigate the evolution of vortices. Simultaneous measurements of lift and thrust forces were taken during plunging to reveal the relationship between the force generation and the surrounding flow field. Results from the flexible hydrofoil were compared directly to results from the rigid one to reveal the influence of flexibility. These results can be used to benchmark future computational work.


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