Article: Optimisation of a small radial turbine impeller of a turbocharger on 0.8 L two-cylinder gasoline engine Journal: International Journal of Vehicle Design (IJVD) 2018 Vol.77 No.3 pp.109 - 131 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. Inderscience Publishers - linking academia, business and industry through research

Title: Optimisation of a small radial turbine impeller of a turbocharger on 0.8 L two-cylinder gasoline engine

Authors: Omer Faruk Atac; Jeong-Eui Yun; Taehyun Noh

Addresses: Department of Mechanical Design Engineering, Kangwon National University, 346 Joongang-ro Samcheok-si, 25913, South Korea ' Department of Mechanical Design Engineering, Kangwon National University, 346 Joongang-ro Samcheok-si, 25913, South Korea ' Keyyang Precision Co. Ltd. Republic of Korea, R&D Center, 1012-4 Eungmyeong-dong (63 Gongdan 4- gil), Gimcheon-si, Gyeongsangbuk-do, South Korea

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.

Keywords: turbocharger; optimisation; radial turbine; wrap angle; rake angle; blade angle; CFD; computational fluid dynamics; DOE; design of experiment; response surface; meridional plane.

DOI: 10.1504/IJVD.2018.098934

International Journal of Vehicle Design, 2018 Vol.77 No.3, pp.109 - 131

Received: 24 Jan 2018
Accepted: 19 Dec 2018
Published online: 09 Apr 2019 *

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Title: Optimisation of a small radial turbine impeller of a turbocharger on 0.8 L two-cylinder gasoline engine

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