A Study of the Effect of Random Input Motion on Low Reynolds Number Flows

The SwRI large water tunnel was modified by the addition of a large test section (.71 m x .81 m x 1.8 m long) to provide low Reynolds number flows with low blockage for models in a highly separated flow condition. Flow characteristics are documented and other physical features are described. The fea...

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Bibliographic Details
Main Authors: Unruh, James F, Park, Joel T, Johnson, James E
Format: Report
Language:English
Subjects:
AIRFOILS
ANGLE OF ATTACK
FLOW
FLOW SEPARATION
FLOW VISUALIZATION
Fluid Mechanics
INPUT
LOW RATE
MOTION
OSCILLATION
REYNOLDS NUMBER
TEST EQUIPMENT
WATER TUNNELS
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Summary:The SwRI large water tunnel was modified by the addition of a large test section (.71 m x .81 m x 1.8 m long) to provide low Reynolds number flows with low blockage for models in a highly separated flow condition. Flow characteristics are documented and other physical features are described. The feasibility of conducting water tunnel experiments involving unsteady aero-hydrodynamics was demonstrated by performing a series of flow visualization studies on a oscillating airfoil (NACA 0012). This experiment was carried out at a reduced fully separated until 17 degress angle of attack, and the downstream wash of the separated flow occurred at 22 degrees. (mjm)