[KSCI] Korea Science Citation Index Service

http://dx.doi.org/10.5293/IJFMS.2015.8.1.023

Rotordynamic Performance Measurements of An Oil-Free Turbocharger Supported on Gas Foil Bearings and Their Comparisons to Floating Ring Bearings

Lee, Yong-Bok (Center for Urban Energy Systems, Korea Institute of Science and Technology)
Park, Dong-Jin (CAE Group, LCD division, Samsung Electronics)
Sim, Kyuho (Department of Mechanical System Design Engineering, Seoul National University of Science and Technology)

Publication Information

International Journal of Fluid Machinery and Systems / v.8, no.1, 2015 , pp. 23-35 More about this Journal

Abstract

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.

Keywords

turbocharger; gas foil bearings; floating ring bearings; rotordynamic performance;

Citations & Related Records

Reference

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