Yong-Bok Lee Dong-Jin Park Kyuho Sim 2024-01-20T08:01:47Z 2024-01-20T08:01:47Z 2022-02-17 2015-01 1882-9554 https://pubs.kist.re.kr/handle/201004/125884 This paper presents the rotordynamic performance measurement of oil-free turbocharger (TC) supported on gas foil bearings (GFBs) for 2 liter class diesel vehicles and comparison to floating ring bearings (FRBs). Oil-free TC was designed and developed via the rotordynamic analyses using dynamic force coefficients from GFB analyses. The rotordynamics and performance of the oil-free TC was measured up to 85 krpm while being driven by a diesel vehicle engine, and compared to a commercial oil-lubricated TC supported on FRBs. The test results showed that the GFBs increased the rotor speed by ~ 20% at engine speeds of 1,500 rpm and 1,750 rpm, yielding the reduction of turbine input energy by more than 400 W. Incidentally, an external shock test on the oil-free TC casing was conducted at the rotor speed of 60 krpm, and showed a good capability of vibration damping due to the well-known dry friction mechanism of the GFBs. ？ 2015 Turbomachinery Society of Japan. All rights reserved. English Korean Fluid Machinary Association Rotordynamic performance measurements of an oil-free turbocharger supported on gas foil bearings and their comparisons to floating ring bearings Article 10.5293/IJFMS.2015.8.1.023 1 International Journal of Fluid Machinery and Systems, v.8, no.1, pp.23 - 35 International Journal of Fluid Machinery and Systems 8 1 23 35 N scopus kci ART002327124 2-s2.0-84924652913 Article Commercial vehicles Compressors Diesel locomotives Engines Oil well testing Superchargers Turbomachinery Vehicle performance Dynamic force coefficients Floating ring bearings Gas foil bearing Gas foil bearing (GFBs) Performance measurements Rotor dynamic analysis Rotordynamic Turbocharger Foil bearings Floating ring bearings Gas foil bearings Rotordynamic performance Turbocharger