Abstract
Characteristics of shear layer roll-up vortices and wake vortices forming on an airfoil in low Reynolds number flows are investigated. The focus is on the effect of the Reynolds number on the shedding frequency of these coherent structures. The pertinent experiments were conducted on a NACA 0025 airfoil for a range of Reynolds numbers from 55,000 to 210,000 and three angles of attack. The shedding frequency of the shear layer roll-up vortices is found to exhibit a power law dependency on the Reynolds number; whereas, the wake vortex shedding frequency varies almost linearly with the Reynolds number. However, the results demonstrate that these correlations depend significantly on the shear layer behavior. Moreover, in contrast to flows over circular cylinders, the ratio of the two frequencies does not exhibit a power low dependency on the Reynolds number.
Published Version
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