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research-article

EXPERIMENTAL ANALYSIS OF ANGLED INJECTION AEROSTATIC HYBRID BEARINGS

[+] Author and Article Information
Julian Le Rouzic

PPRIME Institute, UPR CNRS 3346, Université de Poitiers, ENSMA ISAE, 86962 Chasseneuil Futuroscope, France
julian.le.rouzic@univ-poitiers.fr

Mihai Arghir

PPRIME Institute, UPR CNRS 3346, Université de Poitiers, ENSMA ISAE, 86962 Chasseneuil Futuroscope, France
mihai.arghir@univ-poitiers.fr

1Corresponding author.

ASME doi:10.1115/1.4037873 History: Received July 20, 2017; Revised July 21, 2017

Abstract

Counter-rotation angled injection employed for aerostatic hybrid bearings reduces the cross coupling stiffness that may lead to whirl-whip instabilities at high rotation speeds. The benefits of counter-rotation injection have been known for years. Theoretical investigations were performed for water or air fed hybrid bearings but experiments were conducted only for water fed bearings. The present work is the first effort dedicated to angled injection in air fed hybrid bearings. The tests were performed for a simple rotor supported by two identical hybrid bearings. The hybrid bearings are provided with small size, shallow pockets and are fed with air via counter-rotation oriented orifice type restrictors. An impulse turbine fed with air entrains the rotor. An impact gun applies dynamic excitations and the rotordynamic coefficients are identified from the equations of motion of the rotor. Different air feeding pressures are tested as well as high rotational speeds. Compared to the dynamic characteristics of radial injection hybrid bearings, the direct stiffness of counter-rotation injection bearings has slightly lower values and the direct damping is higher but the main impact is the drastic reduction of the cross-coupling stiffness that may have even negative values.

Copyright (c) 2017 by ASME
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