The Design and Performance of Axially Symmetrical Contoured Wall Diffusers Employing Suction Boundary Layer Control

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Abstract
This paper presents a procedure for the design and the performance prediction of axially symmetrical contoured wall diffusers employing suction boundary layer control. An inverse problem approach was used in the potential flow design of the diffuser wall contours. The experimentally observed flow characteristics, the stability of flows within the diffuser, are also described. Guidelines for the design of low suction (less than 10 percent of the inlet flow) and thus high effectiveness contoured wall diffusers are also provided based on the results of the experimental program. Three short (L/ΔR < 5), high area ratio (3:1) diffusers, which were designed and tested, were found to have effectiveness values in excess of 90 percent (comparable straight wall diffusers have effectiveness < 40 percent). Because of their high effectiveness and short length these diffusers appear to be ideally suited for use as gas turbine combustor diffusers and as turbine discharge diffusers.

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