Performance and flow-field assessment of an EGR pulse optimised asymmetric double-entry turbocharger turbine

摘要

In this paper it will be presented a novel turbine concept specifically designed for exhausts pulse flow energy conservation and EGR control. In order to combine both these features, an asymmetrically divided double-entry turbine was developed to respond to the imbalance of mass flow due to EGR extraction from one side. The EGR side was equipped with variable geometry vanes in order to control the EGR rate and to optimize the flow entering the turbine wheel, whereas no vanes were contemplated in the other turbine entry. A detailed analysis on the design and efficiency of the asymmetric turbine is provided in this paper.