Transient Analysis of 3-lobe Bearings at 80000 Rpm for a Gas Turbine

In this paper the various parameters of the oil flow in a multi lobe bearing are calculated using unsteady kepsilon turbulence model. For realizing the problem a 3 lobe bearing was selected which had the lobes placed at a distance of 120 degrees. The rotation speed of the shaft was considered to be 80000 rpm. The results show a strong affinity of the oil property to segregate to critical values at elevated rotational speeds. Thus the present study could lead towards the formulation of new bearing oil which corresponds to higher performance indices. The results show the presence of lobes highly effect the performance of the multilobe bearing as the critical quantities developed here are comparatively lesser to the other zones in the bearing.

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