The co-generative micro-power plant with the HFE7100 applied as a working medium was designed and built for experimental investigations. Special attention is paid to a micro-turbine which was built and tested in two variants: a radial turbine and an axial turbine. A concept of a radial turbine with 2 centripetal and 2 centrifugal stages is shown. This prototype was equipped with an aerostatic gas bearing and, alternatively, with a foil bearing. An axial multi-stage turbine with partial admission of all the stages is described in detail and the results of experimental investigations and numerical calculations are presented, followed by a discussion and conclusions. The results showed that, for example, remarkable flow separation zones appeared in the nozzle flow channels placed at the edge of the admission segments. The modifications of these channels reduced the undesirable effect. All the stages were equipped with movable blade shields for reducing windage losses. The effect of the angular position of the shields in the succeeding stages was investigated numerically and experimentally. The details, including the strength of particular turbine elements, are discussed and the dynamic behaviour of the turbogenerator rotor system is also examined. The proposed axial micro-turbine has a relatively high efficiency and the rotor speed of about 8000rpm which seems to be a low value compared with the other considered variants.
Authors
Additional information
- Category
- Aktywność konferencyjna
- Type
- publikacja w wydawnictwie zbiorowym recenzowanym (także w materiałach konferencyjnych)
- Language
- angielski
- Publication year
- 2013
