Abstract
In this paper the results of the experimental research of the dynamics of the rotor of a four-wheeled aircraft air cycle machine on gas foil supports under conditions of vibration. The description of the experimental unit, measuring system, and methods of results processing is given. The rotor of the turbomachine is mounted on compliant gas foil journal bearings of the second generation. The rotor speed varied from 20000 to 32000 rpm. The cooling turbine was exposed to broadband random vibration with a mean square value of Vibro-acceleration up to 5 g. The influence of vibration load level, air supply temperature, amplitude-frequency characteristics of the turbine cooler case, and vibration equipment on the rotor dynamics was assessed.
Highlights
The object of this study is a four-wheeled aircraft air cycle machine (ACM) with 2 turbine stages, compressor stage, and fan stage
The ACM rotor is supported by compliant journal gas foil bearings and spring thrust gas foil bearings
The rotor of a high-speed turbomachine on gas foil bearings operates under conditions of complex loading from nonlinear reactions of bearings, forces arising in non-contact seals, and gas forces from the main flow parts
Summary
The object of this study is a four-wheeled aircraft air cycle machine (ACM) with 2 turbine stages, compressor stage, and fan stage. This kind of work can include a study of the stability of the forced induction of diesel engine turbochargers (Keun Ryu, Zachary Ashton, 2017). The development of the theory and practice of vibration studies of the dynamics of high-speed machines contributes to a further increase in the reliability of individual systems and the entire aircraft as a whole. The study of turbomachinery on gas foil bearings is an extremely important area due to its wide range of applications, including space cooling systems (Devkov, 2016)
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