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A Comparison of the Flow Structures and Losses Within Vaned and Vaneless Stators for Radial Turbines

Turbocharging is a key technology for engine downsizing and CO2 reduction. Modern turbochargers utilize either vaned or vaneless turbines; this paper was the first direct performance comparison of the two different design approaches supported by detailed experimental measurements. This work is highly relevant to the turbocharger industry, which produces around 20 million units/year. The project was funded by EPSRC and a leading turbocharger company (Cummins Turbo Technologies, Nick.K.Sharp). All knowledge arising from the project was transferred to the company. Other international companies have also sought information and design input following the publication of this paper (Brayton Energy, Mr Tom Wolf)