Abstract
The effects of wall interference on the drag force for two-dimensional cylinders and equilateral prisms are reported. Test bodies were of single- and multiple-body (single row) configurations. For the former, the models were mounted in the test section with and without eccentricity. In each case, an estimate of the contracted jet velocity uj was obtained from pressure distribution data. Using uj as the reference velocity, it was possible to get a drag coefficient which was nearly independent of the wall interference. In particular, for centrally mounted cylinders (subcritical) and prisms at 60°, the drag coefficient based upon the mean gap velocity u1 was also found to be constant. Consequently, the contraction coefficient is nearly constant for these shapes. The forebody pressure distributions invalidate the earlier concept of interpreting wall interference as an increase in stream velocity.
Published Version
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