The flow pattern and performance of radially-curved mixed-flow vaneless diffusers were examined. From the experimental results the correlation between the inlet flow angle, the radius of curvature of the radially curved test section and diffuser performance was clarified. Favorable inner flow with higher diffuser performance were obtained in the case of diffusers having small pressure gradient normal to the diffuser walls. From this concept, a method to give an optimum configuration of the radially curved diffuser was established.

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