Flow Regimes in Two-Dimensional Ribbed Diffusers.
Final rept. Oct 70-Jun 71,
AIR FORCE AERO PROPULSION LAB WRIGHT-PATTERSON AFB OHIO
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Water table flow visualization tests of a straight wall diffuser and corresponding ribbed diffuser were conducted over a wide range of total divergence angles and diffuser length to throat width ratios. Rib parameters such as inter-rib cavity depth to width ratio, inter-rib cavity width, rib thickness and number of ribs were varied, as well as rib contour. Motion pictures were obtained of the secondary flow patterns occurring within the inter-rib cavities, and hot film measurements were made to determine the extent of velocity fluctuations induced by the cavities. In general, the addition of ribs increased the no-appreciable stall regime by increasing velocity fluctuations near the wall of the diffuser, thereby promoting momentum exchange. Author
- Fluid Mechanics