Measurements of the Near Wake of an Airfoil in Unsteady Flow.
MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF AERONAUTICS AND ASTRONAUTICS
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A series of measurements has been made of the velocities in the near wake of an airfoil in an unsteady flow generated by rotating an elliptic cylinder near the trailing edge. Ensemble averages of the tangential and normal velocity components and of 3 Reynolds stresses were determined for reduced frequencies based on semichord up to 6.4, angles of attack of 0 and 10 degrees, Reynolds numbers of 700,000 and 1,450,000, and chordwise positions 1.025 xc 1.2. In this region the airfoil wake is distinct from the wake of the elliptic cylinder. The mean and unsteady velocities and Reynolds stresses diffuse rapidly so that the distinction between the contributions due to the two boundary layers on the airfoil surfaces, apparent at xc1.025, has largely disappeared by xc1.20. Author
- Fluid Mechanics