Rotordynamic and Bearing Upgrade of a High-Speed Turbocharger

Abstract

The paper discusses the redesign of a high-speed turbocharger for improved bearing life and mechanical operation. The bearings were changed from a pair of combination journal/thrust bearings to a pair of redesigned journal bearings with double acting thrust bearing at the center of the unit. Internal oil passages, drain cavities, and seals were also revised. These modifications resulted in reduced oil leakage across end seals, reduced coke buildup at the turbine, increased thrust load capacity, and improved rotordynamics. Both the analytical and experimental results, which consisted of bearing performance and vibration data of original and modified systems are presented.

Investigation of Weight Effects on the Critical Speed of Inclined Turbocharger Rotor System

“…Rotor dynamics of turbochargers have been studied widely. Pettinato and DeChoudhury [1] analytically and experimentally studied the critical speed and failure mechanisms for redesign a high-speed turbocharger. Chen [2] discussed the critical speed of larger turbochargers with various bearing designs.…”