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http://dx.doi.org/10.5762/KAIS.2020.21.11.765

Turbine Efficiency Analysis of Steady Flow in a Twin Scroll Turbocharger  

Chung, Jin-Eun (Department of Mechanical Engineering, Korea University of Education and Technology)
Jeon, Se-Hun (Department of Mechanical Engineering, Graduate School, Korea University of Education and Technology)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.21, no.11, 2020 , pp. 765-770 More about this Journal
Abstract
The turbochargers used widely in diesel and gasoline engines are effective devices to reduce fuel consumption and emissions. In this study, the isentropic turbine efficiency of the steady flow in a twin-scroll turbocharger for the passenger vehicle gasoline engine was analyzed. The cold gas test bench was designed and made. The pressure and temperature of the inlet and exit of the turbine were measured at 60,000, 70,000, 90,000, and 100,000rpm under the steady-state flow. The isentropic turbine efficiency was calculated. The efficiency was the range of 0.53 to 0.57. The BSR and expansion ratio were changed from 0.71 to 0.84 and from 1.24 to 1.72, respectively. The isentropic turbine efficiency decreased with increasing BSR and expansion ratio. The operation of only scroll A or B was compared with that of the twin-scroll turbine. The isentropic efficiency of using only scroll B was higher than those of only scroll A at 60,000rpm. The isentropic efficiency of using only scroll A was higher than those of only scroll B at 100,000rpm. Therefore, the twin-scroll turbine used in this study is operating effectively in the wide speed range.
Keywords
Cold Gas Test Bench; Steady Flow; Turbine Efficiency; Turbocharger; Twin Scroll;
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