Eventos Anais de eventos
MECSOL 2022
8th International Symposium on Solid Mechanics
Dynamic Evaluation of a Turbopump Rotor Supported by Magnetic Bearings
Submission Author:
Daniel Bourdon , SP
Co-Authors:
Daniel Bourdon, Carlos Souto, Ronaldo Chaves Reis
Presenter: Daniel Bourdon
doi://10.26678/ABCM.MECSOL2022.MSL22-0070
Abstract
The development of a turbopump for liquid propellant rocket engines was initiated at the Institute of Aeronautics and Space (IAE) in 2013, in the context of the L75 Project and under support of the Brazilian Space Agency (AEB). This development includes the design, manufacturing and testing of the turbopump components and assemblies for application in the L75 Rocket Engine. Due to its high rotational speed and interaction with high pressure fluids, the turbopump rotor dynamics is a crucial point for investigation. The vibration induced by the fluid flow in the pumps and the supersonic gas flow in the turbine can overload the bearings and is, usually, the main cause of turbopump failures. Ball bearings are commonly used for turbopump applications due to its high stiffness and accuracy, even though its low damping, fixed stiffness and the need of lubrication fluids motivated the development of innovative alternatives for stably supporting the turbopump rotor. Considering the moving parts are not in contact and so there is no need of lubrication, magnetic bearings have been considered as an alternative to high-speed rotors. This work evaluates the dynamic performance of the L75 engine turbopump rotor prototype radially supported by magnetic bearings. A numerical model is carried out considering the rotor as a flexible structure with a central disc magnetically supported by the shaft ends and driven by a specially designed control system. The magnetic interaction between the magnetic fields and the rotor movement is also considered. Time response graphics and performance index are presented in order to evaluate the capability of the magnetic bearings to dynamically stabilize the turbopump rotor.
Keywords
structural analysis, Rotor Dynamics, Turbopump, Active Magnetic Bearings, Dynamic and Control Systems, Flexible Structures, Vibrations, Rocket
