A small rotor designed to simulate a miniature turbojet engine or turbocharger rotor mounted on compliant foil bearings was tested at speeds in excess of and temperatures above . The simulator rotor-bearing system was operated while positioned in various orientations and was subjected to transient shock impacts exceeding . Subsequent testing was completed to demonstrate the capabilities of miniature thrust foil bearings as well. The tested rotor weighed approximately and used diameter foil journal bearings and a multipad diameter double acting thrust foil bearing. Results of the rotor-bearing system dynamics are presented along with experimentally measured natural frequencies, rotor displacements, and thrust load carrying ability. A good correlation between measurement and analysis is observed. Very short rotor acceleration times from rest to maximum speed were also measured. A parallel test simulator has been used to accumulate over 1000 start-stop cycles to demonstrate the life of the bearing and coating. Based on this successful testing, it is expected that the goal of developing oil-free turbochargers and small turbojet engines that operate at high speeds with long life will be achieved.
Testing of a Small Turbocharger/Turbojet Sized Simulator Rotor Supported on Foil Bearings
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Walton, J. F., II, Heshmat, H., and Tomaszewski, M. J. (March 26, 2008). "Testing of a Small Turbocharger/Turbojet Sized Simulator Rotor Supported on Foil Bearings." ASME. J. Eng. Gas Turbines Power. May 2008; 130(3): 035001. https://doi.org/10.1115/1.2830855
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