Rotor Bearing Loads With Honeycomb Seals And Volute Forces In Reinjection Compressors.
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The calculation for unbalance response of a rotor starts by calculating the bearing load to provide the basis for the bearing stiffness and damping characteristics. Measurements in test rigs at a major Texas university laboratory have shown that honeycomb-stator/drum-rotor annular seals can produce negative stiffness, in particular at zero to low whirl frequencies, which tends to pull the rotor off-center. Data given in this paper, from high-pressure factory test of compressors using a honeycomb seal at the balance piston, have shown the rotor can be displaced from the usual position in the lower part of its journal bearing, degrading the unbalance response. In this paper the authors show that the honeycomb seal can produce a large disturbance in the equilibrium position of the rotor for certain values of negative stiffness, resulting in high bearing loads in unusual direction. It is also shown that aerodynamic forces on the rotor from the volute need to be considered.
Baldassare, Leonardo; Fulton, John W. (2007). Rotor Bearing Loads With Honeycomb Seals And Volute Forces In Reinjection Compressors.. Texas A&M University. Turbomachinery Laboratories. Available electronically from