Measurements of base pressure in the wake of a cylinder at low Reynolds numbers
Abstract
Measurements have been made of the base pressure coefficients of long circular cylinders at low Reynolds numbers (351100) in a cross flow. The variation of base suction (negative base pressure coefficient) with Reynolds number shows a remarkably good correspondence to the variations of the Strouhal number. It is also possible to relate the variation in suction to the physical modes of wake formation found in previous studies. It is shown that the level of base suction is affected in only a minor way by whether parallel or oblique shedding is present, and it is found that the data are independent of the base pressure hole sizes and cylinder diameters. The base suction is essentially constant along the span of a cylinder (outside of regions extending about 20 diameters in from each end), and the results are independent of cylinder aspect ratio above a critical value.
 Publication:

Zeitschrift fur Flugwissenschaften und Weltraumforschung
 Pub Date:
 1990
 Bibcode:
 1990ZFlWe..14...38W
 Keywords:

 Bluff Bodies;
 Circular Cylinders;
 Cross Flow;
 Low Reynolds Number;
 Pressure Measurement;
 Wakes;
 Aspect Ratio;
 Boundary Layer Separation;
 Steady Flow;
 Strouhal Number;
 Unsteady Flow;
 Fluid Mechanics and Heat Transfer