Turbine Performance of Variable Geometry Turbocharger Applied to Small Gasoline Engine Considering Heat Transfer Effect

Jeong-Eui Yun (), Joon-Young Shin, Cartur Harsito, Gi-Yong Kim and Hyung-Jun Kim
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Jeong-Eui Yun: Department Mechanical Engineering, Kangwon National University, Samcheok-si 25913, Gangwon-do, Republic of Korea
Joon-Young Shin: Department of Mechanical Vehicle Engineering, Kangwon National University, Samcheok-si 25913, Gangwon-do, Republic of Korea
Cartur Harsito: Department of Mechanical Computer Industrial Management Engineering, Kangwon National University, Samcheok-si 25913, Gangwon-do, Republic of Korea
Gi-Yong Kim: R&D Center, Keyyang Precision Co., Ltd., Gimcheon-si 39537, Geyeongsangbuk-do, Republic of Korea
Hyung-Jun Kim: R&D Center, Keyyang Precision Co., Ltd., Gimcheon-si 39537, Geyeongsangbuk-do, Republic of Korea

Energies, 2025, vol. 18, issue 14, 1-17

Abstract: The performance of the turbine in a variable geometry turbocharger (VGT) may be affected by changes in the vane operating angle and heat transfer loss during operation. However, existing studies have been conducted under the assumption of an adiabatic process. In this study, we investigated the effect of heat transfer between all working fluids and a VGT structure when using computational fluid dynamics to evaluate turbine performance. Through this study, we confirmed that when heat transfer was considered, the turbine efficiency decreased by approximately 2–6%, depending on the vane position angle change, compared to when heat transfer was not considered. In addition, the total entropy production ratio, which represented the flow loss in the turbine during operation, increased by approximately 0.2–0.5% when heat transfer was considered. In conclusion, the findings confirmed that the heat transfer phenomenon directly affected the efficiency and flow loss during the turbine performance evaluation process.

Keywords: variable geometry turbocharger; turbine performance; vane position angle; entropy production (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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