Accession Number : AD0786887
Title : Flow Regimes in Two-Dimensional Ribbed Diffusers.
Descriptive Note : Final rept. Oct 70-Jun 71,
Corporate Author : AIR FORCE AERO PROPULSION LAB WRIGHT-PATTERSON AFB OHIO
Personal Author(s) : Stull,Frank D.
Report Date : JUN 1974
Pagination or Media Count : 50
Abstract : 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)
Descriptors : *Diffusers, *Fluid flow, Flow separation, Flow visualization, Boundary layer, Test methods
Subject Categories : Fluid Mechanics
Distribution Statement : APPROVED FOR PUBLIC RELEASE