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- W2782508837 abstract "In present study, aerodynamics of a NACA4412 wings with aspect ratio of 1 and 3 was considered experimentally at Reynolds numbers of 2.5 × 10 4 , 5 × 10 4 and 7.5 × 10 4 . Studies for AR = 1 wing showed that stall was delayed and extra (vortex) lift was obtained, because separation bubble got smaller in both chordwise and spanwise axes with effect of wing-tip vortices. Oil-flow experiments at higher angles of attack clarified the reason for vortex lift obtained from AR = 1 wing. However, there was an increase in drag coefficient as well as vortex lift, and stall delayed due to tip vortex. Turbulence intensity distributions pointed out location of the transition to turbulence; Reynolds stress and turbulence kinetic energy distributions indicated shear layer. Furthermore, in experiments of AR = 3 wing, the viscous forces and leading edge vortices were effective at Re = 2.5 × 10 4 and Re = 5 × 10 4 , but flow over the wing at Re = 7.5 × 10 4 acted as a 2D flow. After α = 12°, bubble burst and stall consisted abruptly because effectiveness of 3D flow decreased over wing. Strouhal (St) numbers of vortex shedding frequencies in wake of AR = 3 wing had a certain difference from St = 0.17/sinα curve at lower angle of attack (α = 0° − 10°) due to separation bubble, but AR = 1 wings showed that St numbers were near St = 0.17/sinα curve." @default.
- W2782508837 created "2018-01-12" @default.
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- W2782508837 date "2018-01-03" @default.
- W2782508837 modified "2023-10-02" @default.
- W2782508837 title "Interaction of tip vortex and laminar separation bubble over wings with different aspect ratios under low Reynolds numbers" @default.
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- W2782508837 doi "https://doi.org/10.1177/0954406217749270" @default.
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