Dynamic Behaviour of Meso-Scale Turbines - Application in Dispersed Cogeneration
Jan Kiciński
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Institute of Fluid-Flow Machinery, PAS, Fiszera 14, 80-952 Gdańsk,
University of Warmia and Mazury in Olsztyn, Poland
Pol. J. Environ. Stud. 2010;19(3):491–498
The article discusses tendencies in the development of turbines, from the macro to micro scale, and their possible application in dispersed cogeneration, i.e. in home power installations. On a small scale, turbines and bearings are a source of specific problems connected with securing stable rotor operation and their susceptibility to some material imperfections. This paper presents results of investigations of the high-speed rotor of a micro turbine being an element of the micro power plant in dispersed power engineering based on renewable energy sources. The basic problem of such devices is to assure stable rotor operation within the entire range of rotational speeds. Foil bearings and special rotor structure were applied. It turned out that the situation, in that the rotor – after loosing its stability – stabilizes again when rotational speed increases, is possible. This is a new phenomenon determined by the author as ‘multiple whirls’. Possibilities of stabilizing the situation by the application of hybrid lubrication and siphon pockets also are presented in the paper.