Air Bearing for High Speed Micro Gas Turbine

Muruganandam, M and Ramamurthy, S (2006) Air Bearing for High Speed Micro Gas Turbine. In: 5th National Seminar and Exhibition in Aerospace and Related Mechanisms, 2006, ISRO, Bangalore.

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    Abstract

    This paper deals with the design and analysis of air bearing suitable for high speed micro gas turbine. Design has been carried out for a turbine rotor having symmetrical loading by mathematical modeling and numerical simulation of its dynamic motion. The rigid symmetrical rotor is supported in two air bearings and each bearing is of radial configuration with a cylindrical bush. The input parameters from the micro gas turbine design have been considered for the design of bearing to suit the rotor system. For the established shaft configuration, non-linear Reynolds equation is solved to get the air pressure distribution in the gap between the shaft and the bush. The load capacity of the bearing is calculated by integrating the pressure distribution obtained earlier. The displacements, velocities and dynamic components of load capacity with time are used to evaluate the damping and stiffness coefficients of air film between the journal and the bush. A non-linear equation of motion of the shaft is evolved using the above coefficients. The stability threshold is estimated from the linearized equations of motion. The stability threshold estimation leads to arrival of stability boundaries of rotor bearing system characterized by the required stiffness and damping coefficients of the bush support surrounding the air bearing. The required stiffness and damping coefficients of bush are achieved by providing an air ring around the bush. The complete mathematical procedure has been coded using MATLAB Software.

    Item Type: Conference or Workshop Item (Lecture)
    Subjects: AERONAUTICS > Aeronautics (General)
    AERONAUTICS > Aircraft Propulsion and Power
    Division/Department: Other, Propulsion Division
    Depositing User: Dr S Ramamurthy
    Date Deposited: 13 Aug 2010 10:17
    Last Modified: 13 Aug 2010 10:17
    URI: http://nal-ir.nal.res.in/id/eprint/8947

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