THE LAMINAR BOUNDARY LAYER IN THE VICINITY OF A SUCTION SLOT.
PENNSYLVANIA STATE UNIV UNIVERSITY PARK ORDNANCE RESEARCH LAB
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The interest in suction as a means of controlling the growth of the laminar boundary layer has led to the investigation of the behavior of such a boundary layer in the vicinity of a discrete suction slot. In order to observe the effect of one such slot, detailed boundary layer profiles were measured at various stations upstream and downstream of a slot. The investigation was carried out for the three slot Reynolds numbers equal to 29, 186, and 366. At each Reynolds number slot widths of 116, 332, and 18 inch were tested. Variation in the displacement thickness, momentum thickness and a shape factor based on the ratio of these two parameters indicated that the slot affects a region from 20 to 30 times its own width and introduces substantial changes in the aforementioned variables. In the present tests suction created profiles after the slot with shape factors equal to or less than the asymptotic suction value. Author
- Fluid Mechanics