Investigation of a short-annular-diffuser configuration utilizing suction as a means of boundary-layer control

Stafford W. Wilbur, James T. Higginbotham
naca-tn-3996
Jun 1957


A straight outer-wall annular diffuser having a center-body length of one-half the outer-body diameter and area ratio of 1.9:1 has been investigated for mean inlet flow angles of 0 and 19.5 degrees in order to determine the effect of area suction applied on the inner wall. The entrance shape, number, and location of the openings through which the air was removed were varied. The auxiliary air flow was varied from 0 to approximately 4 percent of the main stream air flow; the mean inlet Mach number was approximately 0.26.

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