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New method of analysis of dynamic state of power micro-devices

Kiciński J.

Mechanics and Mechanical Engineering

2011

Vol. 15, nr 3

259-271

Main energy conversion machinery used and to be used in cogeneration systems are schematically described. Some assets of distributed generation are pointed out and small-scale cogeneration systems designed for energy units of distributed cogeneration are described. In the small scale, turbines and bearings are a source of specific problems connected with securing stable rotor operation. Accepted has been two kind of high speed microturbines of electric power about 3 KW with multistage axial and radial rotors supported on foil bearings. A concept which becomes more and more attractive takes into account low-boiling agent, which is normally used in the thermal cycle of the microturbine, as a lubricating liquid in the bearings (so called ORC based systems). The scope of the present article is limited to the discussion of dynamic characteristics of the selected design. The properties of the rotor combined with slide bearings (foil bearings in this particular ease) were taken under investigation. A combination of this type is a certain novelty, since a typical modal analysis of such objects refers to a rotor itself. Analysing the dynamic state of the "home" power plants requires qualitatively novel research tools. It turned out that the situation, in that the rotor - after losing its stability - stabilizes again when the rotational speed increases, is possible. This is a phenomenon determined by the author as multiple whirls.