Performance of Wide-Angle Two-Dimensional Diffusers with Area Suction

Two-dimensional diffusers with an area ratio of 4:1, aspect ratio 4:1, and divergence angles of 30° and 60° were tested with area suction to evaluate the performance characteristics. For comparative purposes, a 10° two-dimensional diffuser without area suction was also tested. The test, conducted with various extents of porous area and with suction quantities, indicated that the flow separation was not exactly eliminated by the use of area suction for both 30° and 60° diffusers. However, the area suction was effective to improve the diffuser performance, and larger effect of suction was obserbed for smaller extents of porous area near the diffuser entrance