Abstract
The aim of this study is to optimise the very small turbine impeller of a turbocharger used in a 0.8 L two-cylinder gasoline engine by presenting an additional design parameter (rake angle), that has not been utilised thus far in traditional design studies, as well as other conventional design parameters. The design points, which are constructed for 10 assigned parameters through the design of experiment (DOE), are evaluated using the surrogate-based single-objective optimisation technique incorporating three-dimensional Reynold-average Navier-Stokes (RANS) analyses to maximise the isentropic efficiency. The results show that each of the assigned parameters has a considerable effect on the efficiency; in particular, the rake angle can increase the efficiency up to 2.5% and 2% improvement can be achieved with optimal wrap angle. In addition, optimised parameters for hub and shroud curves can lead to an improved flow pattern in the inlet and outlet regions of the blade passage, and hence, the efficiency.
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