Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : March 14, 2022 - March 15, 2022
In this study, the influences of the shape of scroll passage on the flow behavior at the inlet of turbine rotor of turbocharger with the variable geometry system were investigated by using commercial CFD code. The computations were performed for the simplified model which is composed of the inlet duct, the scroll, the vaned nozzle and the exhaust pipe without the turbine rotor. The computed results clarified that the tongue and the overhang shapes of the scroll deteriorated the circumferential uniformities of the physical quantities such as the flow angle and the total pressure loss at the nozzle inlet. However, the nozzle vane installed in the nozzle passage improved the circumferential uniformity at the nozzle outlet by its straightening effect. Moreover, the overhang shape of the scroll increased the total pressure loss at the nozzle outlet due to the deflection of the main flow toward the hub side wall at the nozzle inlet.
