Abstract
A description is given of some problems caused by unsteady forces generated by the leakage flow through turbomachinery labyrinth seals. Three examples where such problems are encountered in compressor and turbine practice are discussed. The first example concerns serious damage to a compressor rotor in a chemical factory, while the other two refer to the behaviour of steam turbines in electric power stations. Malfunctions, in two out of three cases, occurred after the modernization of the rotors and after the thorough overhaul of the machines. During the modernization new seals were applied, i.e. shaft seals for the compressor and a new type of blade shrouding seal for the steam turbine. One example concerns a situation where the vibrations appeared due to misalignment of the rotor during the turbine operation. Investigations are reported on self-excited vibrations as a result of rotor whirl around its initial position. Some suggestions are made about the identification of this kind of vibration and its i...
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