Abstract
Tests were conducted in the Boeing Diffuser Test Facility to investigate the effect of centerline offset, wall suction, and blowing on diffuser performance. Effects of offset were studied using a family of two-dimensional diffusers. Effectiveness of wall suction and blowing in controlling the diffuser boundary layer was investigated initially with the highest offset two-dimensional diffuser. This was followed by a more detailed investigation of wall suction and blowing using a three-dimensional offset diffuser model. Configuration variables included centerline offset, hole area for distributed suction, and blowing slot height. Diffuser exit total pressure profiles and longitudinal wall static pressure distributions were measured to determine diffuser overall performance and obtain an indication of local flow behavior. Test results indicate that good performance can be achieved for diffusers with large offset by using small amounts of wall suction or blowing upstream of the separation point.
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