||Flow Structure of Recirculating Wake Flows Downwind of Surface-Mounted Bluff Obstacles.
Lawson, R. E.;
Snyder, W. H.;
Hunt, J. C. R.;
||Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Sciences Research Lab. ;Cambridge Univ. (England). Dept. of Applied Mathematics and Theoretical Physics.
Ink dot technique
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||Wind-tunnel tests were conducted to examine the surface and centerplane flow structure downwind of several surface-mounted obstacles immersed in shallow and deep boundary layers for Reynolds numbers on the order of 10 to the fifth power. Observations were made using the ink-dot method of flow visualization wherein dots of soluble ink were placed on the surface to be examined, then, just prior to the tests, dissolved with a thin coating of oil-of-wintergreen. The movement of the resulting ink-tracer under the action of surface stresses produced detailed records of the near-surface flow patterns even in these highly turbulent, recirculating flows. The resulting flow features are shown to be qualitatively similar to those obtained by other investigators using more time-consuming quantitative techniques or less-detailed qualitative techniques. Centerplane flow patterns obtained by the introduction of centerplane splitter plates were found to distort the geometry of the wake flow pattern while maintaining a topologically consistent structure. Small changes in the shape of the body are shown to produce rather dramatic changes in the structure of the recirculating wake downwind of the body.
||Prepared in cooperation with Cambridge Univ. (England). Dept. of Applied Mathematics and Theoretical Physics.
||Reprint: Flow Structure of Recirculating Wake Flows Downwind of Surface-Mounted Bluff Obstacles,
|PUB Date Free Form
||55B; 55D; 46B
||PC A02/MF A01